CEN/TC 234 - Gas infrastructure

This document describes the specific functional requirements for the transportation of gases (gaseous energy carriers) through service lines in addition to the general functional requirements of EN 12007 1 for:
a)   a maximum operating pressure (MOP) up to and including 16 bar;
b)   an operating temperature between −20 °C and +40 °C;
c)   gases and blends of gases which are in the gaseous state when conveyed in the gas pipeline infrastructure such as hydrogen, hydrogen rich, and methane rich gases, dimethyl ether (DME) and propane and butanes used for combustion and/or as feedstock, excluding steam and compressed air, where technical evaluation has ensured that operating conditions, constituents and properties of the gas do not affect the safe operation and maintenance of the service line.
It applies to their design, construction, commissioning, decommissioning, operation, maintenance, extension and other associated works including safety and environmental aspects. The service line is the physical asset comprising of pipework from the gas main branch saddle or top tee to the outlet of the distribution system operator’s nominated point(s) of delivery (for example: isolation valve, regulator, meter connection or combination of regulator and isolation valve).
This document does not apply retrospectively to installations before the publication date unless specifically stated.
Specific functional requirements for:
—   polyethylene pipelines are given in EN 12007 2;
—   steel pipelines are given in EN 12007 3;
—   polyamide (PA-U) pipelines are given in CEN/TS 12007 6;
—   pipework for buildings are given in EN 1775;
—   pressure regulating installations are given in EN 12279 or EN 12186;
—   pressure testing, commissioning and decommissioning are given in EN 12327;
—   safety management system (SMS) and pipeline integrity management system (PIMS) are given in EN 17649.
This document specifies common basic principles for gas infrastructure. Users of this document are expected to be aware that there can exist more detailed national standards and/or codes of practice in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of terms of additional requirements in legislation/regulation than in this document, CEN/TR 13737 (all parts) illustrates these terms.
CEN/TR 13737 gives:
—   description of legislations/regulations applicable in a member state;
—   if appropriate, more restrictive national requirements;
—   a national contact point for the latest information.

This document establishes the functional requirements for stations for the injection of biomethane, substitute natural gas (SNG) and hydrogen into gas transmission and distribution systems operated with gases (natural gas, biomethane, SNG, hydrogen, gas mixtures) in accordance with European technical rules that ensure the interoperability of systems.
Figure 1 describes the general approach including all the relevant functions that can be installed in different configurations. The injection of Hydrogen is covered separately in EN 17928-3:2024.
This document also applies to refeeding stations that feed such gases back into upstream gas supply networks; see Figure 2.
This document represents the state of the art at the time of its preparation.
This document does not apply to injection stations operating prior to the publication of this document.
This document specifies common basic principles for gas infrastructure. Users of this document are expected to be aware that more detailed national standards and/or codes of practice can exist in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of terms of additional requirements in national legislation/regulation than in this document, CEN/TR 13737 (all parts) illustrates these terms.
CEN/TR 13737 (all parts) gives:
—   legislation/regulations applicable in a member state;
—   if appropriate, more restrictive national requirements;
—   a national contact point for the latest information.

This document establishes specific functional requirements for injection stations for biomethane into gas transmission and distribution systems operated with gases of the second gas family in accordance with EN 437 in addition to the general functional requirements of EN 17928 1:2024.
This document represents the recommendations at the time of its preparation. This document does not apply to injection stations operating prior to the publication of this document.
This document complements EN 17928 1:2024 by specifying the technical safety requirements to be observed in respect of the chemical and physical properties of biomethane.
This document specifies common basic principles for gas infrastructure. Users of this document are expected to be aware that more detailed national standards and/or codes of practice can exist in the CEN member countries.
This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of terms of additional requirements in national legislation/regulation than in this document, CEN/TR 13737 (all parts) illustrates these terms.
CEN/TR 13737 (all parts) gives:
—   legislation/regulations applicable in a member state;
—   if appropriate, more restrictive national requirements;
—   a national contact point for the latest information.

This document describes the functional requirements for pipelines for maximum operating pressure over 16 bar. This document also describes the mechanical requirements for pipework in stations with a maximum operating pressure greater than 16 bar.
NOTE 1   Welding requirements are described in EN 12732. Functional requirements for stations are given in EN 1776, EN 1918-5, EN 12186, and EN 12583.
This document is applicable for transporting gas via onshore high-pressure steel pipeline infrastructures, where the following applies:
-   onshore:
-   from the point where the pipeline first crosses what is normally accepted as battery limit between onshore and offshore, and that is not located within commercial or industrial premises as an integral part of the industrial process on these premises except for any pipelines and facilities supplying such premises;
-   pipeline system with a starting point onshore, also when parts of the pipeline system on the mainland subsequently cross fjords, lakes, etc.
-   high pressure: gas with a maximum operating pressure over 16 bar and a design temperature between −40 °C and 120 °C.
-   steel pipeline infrastructure: infrastructure consisting of pipeline components, such as pipes, valves, couplings and other equipment, restricted to components made of unalloyed or low alloyed carbon steel and joined by welds, flanges or mechanical couplings.
-   gas: non-corrosive natural gas, biomethane gas, hydrogen gas and mixtures of these gases where technical evaluation has ensured that operating conditions or constituents or properties of the gas do not affect the safe operation of the pipeline.
Gas infrastructures covered by this document begin after the gas producer's metering station.
NOTE 2   The functional demarcation of the pipeline system is usually directly after an isolating valve of the installation, but can differ in particular situations. The functional demarcation of the pipeline system is usually located on an isolating valve of the installation, but can differ in particular situations.
A schematic representation of pipelines for gas infrastructure is given in Figure 1.
This document can also be applied to the repurposing of existing pipelines.
[Figure 1 - Schematic representation of pipelines for gas supply over 16 bar]
This document specifies common basic principles for gas infrastructure. Users of this standard are expected to be aware that more detailed national standards and/or code of practice can exist in the CEN member countries.
This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737.
CEN/TR 13737 gives:
-   clarification of all legislations/regulations applicable in a member state;
-   if appropriate, more restrictive national requirements;
-   a national contact point for the latest information.

This Technical Report gives explanation on the pressure definitions and pressure units used by the gas network operators with regard to the standards of CEN/TC 234 “Gas infrastructure” listed in Clause 2.
The European Standards of CEN/TC 234 comprise the functional requirements in the field of gas infrastructure from the input of gas into the on-shore transmission network up to the inlet connection of gas appliances, including transmission, distribution, storage, compression, pressure regulation and metering, installation, injection of (renewable) gases such as biomethane, hydrogen, gas quality issues and others.

This document defines the quality of gaseous hydrogen, i.e. its parameters and limiting values, to be transmitted, injected into and extracted from storages, distributed and utilized in fully and/or partially rededicated gas infrastructure and connected applications in a safe way.
This document gives evidence to the end-user which minimum exit hydrogen quality can be expected and ensured from natural gas infrastructure as minimum requirement and without further purification.
NOTE 1   The rededicated gas infrastructure can include new parts of this infrastructure constructed/added after the conversion of the natural gas grid.
NOTE 2   It is expected that over time the hydrogen delivered through such pipework will improve in quality, e.g. due to the increase in share of high purity hydrogen produced by electrolysis This will be taken into account in further development of this document.

This European Standard specifies detailed functional requirements for the design, selection of materials, construction, inspection and testing of:
-   industrial gas installation pipework and assemblies with an operating pressure greater than 0,5 bar; and
-   non-industrial gas installation pipework (residential and commercial) with an operating pressure greater than 5 bar in buildings;
starting from the outlet of the network operator’s point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This standard also covers the pipework to the inlet connection of a gas appliance that is not included within the scope of the appliance standard.
NOTE 1   The use of the term installation and pipework is interchangeable.
Apart from the exceptions stated below, this standard applies to gas installations operating at ambient temperatures between −20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should additionally be made to EN 13480 (all parts) for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non-industrial (residential and commercial) gas installations up to and including 5 bar in buildings, EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European Standards, this standard applies.
In this European Standard, the term “gas“ refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure (normal conditions). These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases as classified in EN 437:2003+A1:2009, Table 1. The given values are considered as normal conditions for all volumes given in this standard.
This European Standard is applicable to installation pipework for the carriage of:
-   processed, non-toxic and non-corrosive natural gas according to EN 437:2003+A1:2009 and EN 16726 "Gas infrastructure - Quality of gas - Group H";
-   vaporized LPG;
-   biomethane, complying with EN 16723 1;
-   vaporized LNG.
NOTE 2   The specification of vaporized LNG is equal to that of natural gas as classified in EN 437:2003+A1:2009.
This European Standard does not cover pipework for hydrogen rich gases that fall outside the definitions within EN 437:2003+A1:2009.
LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure in the liquid state (e.g. between the storage vessel and any pressure regulator).
In this standard, all pressures are gauge pressures unless otherwise stated.
This standard has been harmonized to address the essential safety requirements of the Pressure Equipment Directive (PED, 2014/68/EU [formerly 97/23/EC]) relevant for the joining of gas installation pipework (assemblies) falling within the scope of the PED. These are listed in Annex ZA. However, "this Directive does not cover the assembly of pressure equipment on the site and under the responsibility of the user, as in the case of industrial installations" (PED, Preamble, 7th recital, last paragraph).
Although in this respect, the standard takes into account the essential safety requirements of the PED, no inference can be drawn from this as to whether or not the installation or parts of the installation falls within the scope of the PED. Reference should therefore be made to the PED and relevant national legislation.
This European Standard specifies common basic principles for gas supply systems. Users of this European Standard should be aware (...)

This European Standard specifies detailed functional requirements for the commissioning, operation and maintenance of
-   industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of
-   non-industrial gas installations (residential and commercial) with an operating pressure greater than 5 bar,
starting from the outlet of the network operator’s point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This European Standard also covers the pipework to the inlet connection of a gas appliance that is not included within the scope of the appliance standard.
NOTE   The use of the term installation and pipework is interchangeable.
Apart from the exceptions stated below, this standard applies to gas installations operating at ambient temperatures between -20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should additionally be made to EN 13480 for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non-industrial (residential and commercial) gas installations up to and including 5 bar EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European Standards, this European Standard applies.
In this European Standard, the term "gas" refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure. These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases as classified in Table 1 of EN 437:2003+A1:2009. The given values are considered as normal conditions for all volumes given in this standard.
This European Standard is applicable to installation pipework for the carriage of:
-   processed, non-toxic and non-corrosive natural gas according to EN 437:2003+A1:2009 and EN 16726 -Gas infrastructure - Quality of gas - Group H”,
-   vaporized LNG,
-   biomethane, complying with EN 16723-1,
-   vaporized LNG.
NOTE   The specification of vaporized LNG is equal to that of natural gas as classified in EN 437:2003+A1:2009.
This European Standard does not cover pipework for hydrogen rich gases that fall outside the definitions within EN 437:2003+A1:2009. LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure (e.g. between the storage vessel and its pressure regulator).
In this European Standard, all pressures are gauge pressures unless otherwise stated.
This European Standard specifies common basic principles for gas supply systems. Users of this European Standard should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
For gas installations within the scope of this standard, national legislation and regulations have to be taken into account.
Functional requirements for design, selection of materials, construction, inspection and testing of industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of gas installations greater than 5 bar in buildings and areas intended for residential, commercial, public and mixed uses are described in EN 15001-1.
Generally, additional safety precautions may be necessary where non odorized gas is used. For non-industrial purposes, the gas should be odorized.

This document specifies requirements on the development and implementation of a Safety Management System (SMS) and a Pipeline Integrity Management System (PIMS). The SMS is applicable for system operators of a gas infrastructure. The PIMS is applicable for system operators of gas infrastructure with a maximum operating pressure (MOP) over 16 bar.
This document refers to all activities and processes related to safety aspects and performed by system operators of a gas infrastructure, including those activities entrusted to contractors. It includes safety-related provisions on operation of the gas infrastructure.
This document is applicable to infrastructure for the conveyance of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and gases such as biomethane and hydrogen and to mixtures of these gases with natural gas.
This document covers also gases classified as group H, that are to be transmitted, injected into and from storages, distributed and utilized, as specified in EN 16726. For the requirements and test methods for biomethane at the point of entry into a natural gas network, reference is made to EN 16723-1.
This document can be applied for gas infrastructure conveying gases of the 3rd gas family as classified in EN 437 or for other gases such as carbon dioxide.
Specific requirements for occupational health and safety are excluded from this document. For these, other European and/or international standards, e.g. ISO 45001, apply.
This document specifies common basic principles for gas infrastructure. It is important that users of this document are expected to be aware that more detailed national standards and/or codes of practice exist in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE CEN/TR 13737 (all parts) contains:
- clarification of relevant legislation/regulations applicable in a country;
- if appropriate, more restrictive national requirements;
- national contact points for the latest information.

This document contains requirements for the production and testing of weld joints for the installation and modification, including in-service welding, of onshore steel pipelines and pipework used in gas infrastructure. This includes all pressure ranges and processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and non-conventional gases such as (injected) biomethane and hydrogen, where:
-   the pipeline elements are made of unalloyed or low-alloyed carbon steel;
-   the pipeline is not located within commercial or industrial premises as integral part of the industrial process on those premises except for any pipelines and facilities delivering gas to such premises;
-   the pipework is not located within households or industrial installations according to EN 1775 or EN 15001;
-   the design temperature of the system is between −40 °C up to and including 120 °C.
For injected biomethane or hydrogen a detailed technical evaluation of the functional requirements is required, ensuring there are no other constituents or properties of the gases that can affect the integrity of the pipeline.
This document is not applicable to welds produced prior to the publication of this document.
This document specifies common basic principles for gas infrastructure. Users of this document are expected to be aware that there can exist more detailed national standards and/or codes of practice in the CEN member countries.
This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.

This document is written in preparation of future standardization and provides guidance on the
impact of the injection of H2 into the gas infrastructure from the input of gas into the on­shore
transmission network up to the inlet connection of gas appliances. 
Furthermore, it identifies the expected revision need of the existing CEN/TC 243 standards as
well as the need of further new standardisation deliverables. 
It examines the effects on each part of the gas infrastructure in the scope of the CEN/TC 234
Working Groups 1 to 12 inclusive, based on available studies, reports and research. Due to
several limitations at different hydrogen concentrations, the impacts are specified. 
For some specific impact, pre­standardization research is needed. 
By convention, for this technical report, the injection of pure hydrogen, i. e. without trace
components is considered. 
The information from this report is intended to define the CEN/TC 234 work program for the
coverage of H2NG in relation to the scope of the CEN/TC 234 and its WGs. 
NOTE Progress on hydrogen will develop over time. In principle this will be reflected in the
standardisation process in CEN/TC 234.

This document describes the specific functional requirements for polyamide (PA) pipelines in addition to the general functional requirements of EN 12007-1 for:
a) a maximum operating pressure (MOP) up to and including 16 bar;
b) an operating temperature between −20 °C and +40 °C.
This document covers one type of pipe:
- PA pipes single layer solid wall.
This document specifies common basic principles for gas infrastructure.
NOTE 1 Users of this document are aware that more detailed national standards and/or code of practice can exist in the CEN member countries.
This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
NOTE 2 In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
CEN/TR 13737 (all parts) give:
- clarification of all legislations/regulations applicable in a member state;
- if appropriate, more restrictive national requirements;
- a national contact point for the latest information.

This European standard specifies gas quality characteristics, parameters and their limits, for gases classified as group H that are to be transmitted, injected into and from storages, distributed and utilized.
NOTE   For information on gas families and gas groups see EN 437.
This European standard does not cover gases conveyed on isolated networks.
For biomethane, additional requirements indicated in prEN 16723 1 apply.

This Technical Report gives recommendations to ensure the quality and safety of domestic gas installations. This Technical Report covers pipe work, appliances installation, their combustion air supply and flue products exhaust commissioning, inspection and maintenance activities carried out by operatives.
This document addresses the following three main factors, which have an influence on gas safety in general:
a)   quality and safety of components of gas installations and gas appliances,
b)   quality of the work when gas installations are constructed and commissioned,
c)   inspection and maintenance of installations and gas appliances.
Potential ways in which individual competence of operatives and/or businesses can be ensured and mutually recognized between Member States are considered.
The means of assuring responsible behaviour of consumers is not covered in this document.
It does not address metering or non-domestic (industrial and commercial) installations.

This European Standard covers the functional recommendations for the design, construction, testing, commissioning, operation, maintenance and abandonment of the surface facilities for underground gas storage (UGS), between the wellhead and the connection to the gas grid.
It specifies practices which are safe and environmentally acceptable.
For necessary subsurface facilities for underground storage, the relevant part of EN 1918-1 to EN 1918-4 applies.
In this context, "gas" is any hydrocarbon fuel:
-   which is in a gaseous state at a temperature of 15 °C and under a pressure of 0,1 MPa (this includes natural gas, compressed natural gas (CNG) and liquefied petroleum gas (LPG). The stored product is also named fluid);
-   which meets specific quality requirements in order to maintain underground storage integrity, performance, environmental compatibility and fulfils contractual requirements.
This European Standard specifies common basic principles for underground gas storage facilities. Users of this European Standard should be aware that more detailed standards and/or codes of practice exist. A non-exhaustive list of relevant standards can be found in Annex A.
This European Standard is intended to be applied in association with these national standards and/or codes of practice and does not replace them.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.
This European Standard is not intended to be applied retrospectively to existing facilities.

This European Standard covers the functional recommendations for design, construction, testing, commissioning, operation, maintenance and abandonment of underground gas storage (UGS) facilities in aquifers up to and including the wellhead.
It specifies practices, which are safe and environmentally acceptable.
For necessary surface facilities for underground gas storage, EN 1918-5 applies.
In this context "gas" is any hydrocarbon fuel:
-   which is in a gaseous state at a temperature of 15 °C and under a pressure of 0,1 MPa (this includes natural gas, compressed natural gas (CNG) and liquefied petroleum gas (LPG). The stored product is also named fluid);
-   which meets specific quality requirements in order to maintain underground storage integrity, performance, environmental compatibility and fulfils contractual requirements.
This European Standard specifies common basic principles for underground gas storage facilities. Users of this European Standard should be aware that more detailed standards and/or codes of practice exist. A non-exhaustive list of relevant standards can be found in Annex A.
This European Standard is intended to be applied in association with these national standards and/or codes of practice and does not replace them.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.
This European Standard is not intended to be applied retrospectively to existing facilities.

This European Standard covers the functional recommendations for design, construction, testing, commissioning, operation, maintenance and abandonment of underground gas storage facilities in oil and gas fields up to and including the wellhead.
It specifies practices which are safe and environmentally acceptable.
For necessary surface facilities for underground gas storage, FprEN 1918-5 applies.
In this context "gas" is any hydrocarbon fuel:
-   which is in a gaseous state at a temperature of 15 °C and under a pressure of 0,1 MPa (this includes natural gas, compressed natural gas (CNG) and liquefied petroleum gas (LPG). The stored product is also named fluid);
-   which meets specific quality requirements in order to maintain underground storage integrity, performance, environmental compatibility and fulfils contractual requirements.
This European Standard specifies common basic principles for underground gas storage facilities. Users of this European Standard should be aware that more detailed standards and/or codes of practice exist. A non-exhaustive list of relevant standards can be found in Annex A.
This European Standard is intended to be applied in association with these national standards and/or codes of practice and does not replace them.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.
This European Standard is not intended to be applied retrospectively to existing facilities.

This European Standard covers the functional recommendations for design, construction, testing, commissioning, operation, maintenance and abandonment of underground gas storage (UGS) facilities in solution-mined salt caverns up to and including the wellhead.
It specifies practices which are safe and environmentally acceptable.
For necessary surface facilities for underground gas storage, EN 1918-5 applies.
In this context "gas" is any hydrocarbon fuel:
—   which is in a gaseous state at a temperature of 15 °C and under a pressure of 0,1 MPa (this includes natural gas, compressed natural gas (CNG) and liquefied petroleum gas (LPG). The stored product is also named fluid);
—   which meets specific quality requirements in order to maintain underground storage integrity, performance, environmental compatibility and fulfils contractual requirements.
This European Standard specifies common basic principles for underground gas storage facilities. Users of this European Standard should be aware that more detailed standards and/or codes of practice exist. A non-exhaustive list of relevant standards can be found in Annex A.
This European Standard is intended to be applied in association with these national standards and/or codes of practice and does not replace them.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE   CEN/TR 13737 (all parts) contains:
—   clarification of relevant legislation/regulations applicable in a country;
—   if appropriate, more restrictive national requirements;
—   national contact point for the latest information.
This European Standard is not intended to be applied retrospectively to existing facilities.

This European Standard covers the functional recommendations for design, construction, testing, commissioning, operation, maintenance and abandonment of underground gas storage (UGS) facilities in mined rock caverns up to and including the wellhead.
This European Standard does not cover the technology of lined rock.
NOTE 1   Even if not covered in this standard, the lined rock is an available technology.
This European Standard specifies practices which are safe and environmentally acceptable.
For necessary surface facilities for underground gas storage, EN 1918-5 applies.
In this context, "gas" is any hydrocarbon fuel:
-   which is in a gaseous state at a temperature of 15 °C and under a pressure of 0,1 MPa (this includes natural gas, compressed natural gas (CNG) and liquefied petroleum gas (LPG). The stored product is also named fluid);
-   which meets specific quality requirements in order to maintain underground storage integrity, performance, environmental compatibility and fulfils contractual requirements.
This European Standard specifies common basic principles for underground gas storage facilities. Users of this European Standard should be aware that more detailed standards and/or codes of practice exist. A non-exhaustive list of relevant standards can be found in Annex A.
This European Standard is intended to be applied in association with these national standards and/or codes of practice and does not replace them.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE 2   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.
This European Standard is not intended to be applied retrospectively to existing facilities.

This European Standard specifies functional requirements for the design, construction, testing, commissioning/decommissioning, operation, maintenance and where appropriate calibration, together with suitable documented provisions for all new gas measuring systems and any major changes of existing systems.
This European Standard also specifies accuracy classes of measuring systems and thresholds applicable to these classes. Demonstration of compliance is achieved through the selection, installation and operation of appropriate measurement instruments, together with suitable documented provisions for calculations. Examples of demonstration of compliance are provided for each accuracy class; however, they are not prescriptive solutions.
This European Standard is applicable for gases of the 2nd family as classified in EN 437. It is also applicable for treated non-conventional combustible gases complying with EN 437 and for which a detailed technical evaluation of the functional requirements (such as injected biomethane) is performed ensuring there are no other constituents or properties of the gases that can affect the metrological and physical integrity of the measuring systems.
This European Standard can also be used as a guideline for 1st and 3rd family gases as classified in EN 437; however additional considerations should be taken with regard to the different constituents and physical characteristics of the gas family.
This European Standard is not applicable for raw or sour gases.
This European Standard is not applicable for gas measurement in CNG filling station.
This European Standard gives guidelines when designing, installing and operating gas meters with additional functionalities (smart meters).
Unless otherwise specified all pressures used in this European Standard are gauge pressures.
For associated pressure regulating systems the requirements of EN 12186 and/or EN 12279 apply.
For requirements on design, housing, lay-out, materials for components, construction, ventilation, venting and overall safety of gas measuring systems within the scope of this European Standard, EN 15001, EN 12186, EN 12279 and/or EN 1775 apply additionally, where relevant.
This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, national legislation/regulation takes precedence as illustrated in CEN/TR 13737 parts 1 and 2.
CEN/TR 13737 (all parts) gives:
   clarification of all legislation/regulations applicable in a member state;
   if appropriate, more restrictive national requirements;
   a national contact point for the latest information.

This European Standard describes the specific functional requirements for steel pipelines in addition to the general functional requirements of EN 12007-1 for maximum operating pressures up to and including 16 bar. This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
CEN/TR 13737 (all parts) gives:
-   clarification of all legislation/regulations applicable in a member state;
-   if appropriate, more restrictive national requirements;
-   a national contact point for the latest information.

This European Standard contains the relevant functional requirements for gas pressure regulating stations, which form part of gas transmission or distribution systems. It is applicable to the design, materials, construction, testing, operation and maintenance of gas pressure regulating stations.
This European Standard does not apply to gas pressure regulating stations commissioned prior to the publication of this standard.
The stations covered by this European Standard have a maximum upstream operating pressure which does not exceed 100 bar. For higher maximum upstream operating pressures this standard should be used as a guideline.
If the inlet pipework of the station is a service line and the maximum upstream operating pressure does not exceed 16 bar and the design flow rate is equal to or less than 200 m3/h under normal conditions, EN 12279 applies.
Basic system requirements for gas pressure regulating stations are contained in this European Standard. Requirements for individual components (valves, regulators, safety devices, pipes, etc.) or installation of the components are contained in the appropriate European Standards.
NOTE   For combined regulating and measuring stations, the additional requirements of EN 1776 can apply.
The requirements in this European Standard do not apply to the design and construction of auxiliary facilities such as sampling, calorimetering, odorization systems and density measuring. These facilities are covered by the appropriate European Standards, where existing, or other relevant standards.
The requirements of this European Standard are based on good gas engineering practice under conditions normally encountered in the gas industry. Requirements for unusual conditions cannot be specifically provided for, nor are all engineering and construction details prescribed.
The requirements in this European Standard are based on the physical and chemical data of gaseous fuels – including non-conventional gases – in accordance with Table 1 of EN 437:2003+A1:2009 for first and second family gases. Additional requirements in the case of gaseous fuels heavier than air and/or sour gases are not covered by this European Standard.
The objective of this European Standard is to ensure the safe operation of such stations. This does not, however, relieve all concerned of the responsibility for taking the necessary care and applying effective quality management during the design, construction and operation.

This Technical Report contains, for each country affected, a national page where the relevant national legislation/regulations for the field of gas infrastructure are listed. The national page can further contain the relevant national standards and/or codes of practice and national bodies which can act as further sources of information, if an interested party needs further guidance.
The national page can, if necessary, indicate any requirements in the national legislation/regulations that are more stringent than those in the European Standards prepared by CEN/TC 234. This is done however without giving any details.
This does not apply to requirements contained in clauses that are harmonized to any new approach directive.
This Technical Report is intended to be a guideline for the national implementation of the functional European Standards elaborated by CEN/TC 234 "Gas infrastructure".

This Technical Report applies to safety and operational topics for equipment and pipework systems installed within industrial premises which may be used for process and non-process applications such as Heating, Power Generation, Incineration, etc.
It is applicable to a range of combustible gases used within an industrial environment. The gas plant may include normal combustion with air and/or oxygen, catalytic oxidation or cracking (e.g. as in a refinery).
The user of gas equipment and pipework systems has a responsibility to ensure the safety of the design, of plant operation and plant maintenance.
For piped supplies of gas to a site this Technical Report applies to the system downstream of the ‘point of delivery’. The term, ‘point of delivery’ refers to the isolation valve (or combination of regulator and isolation valve) located before or after the metering station, as will be defined by the particular EU member state national legislation.
The guidance in this Technical Report may also apply to gases generated for the sites own use, such as coke oven gas, site bio-gas plant, site LPG/air plant etc.

This European Standard describes the specific functional requirements for polyethylene (PE) pipelines in addition to the general functional requirements of EN 12007-1 for:
a)   a maximum operating pressure (MOP) up to and including 10 bar;
b)   an operating temperature between -20 °C and +40 °C.
This European Standard covers three types of pipe:
-   PE pipes including any identification stripes;
-   PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe;
-   PE pipes with a peelable, contiguous thermoplastics additional layer on the outside of the pipe.
This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries. This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation should take precedence as illustrated in FprCEN/TR 13737-1.
FprCEN/TR 13737-1 gives:
-   clarification of all legislations/regulations applicable in a member state;
-   if appropriate, more restrictive national requirements;
-   a national contact point for the latest information.

This European Standard describes the general functional requirements for pipelines up to the point of delivery, and also for buried sections of pipework after the point of delivery, for maximum operating pressures up to and including 16 bar for gaseous fuels in accordance with EN 437:1993+A1:2009, Table 1. It applies to their design, construction, commissioning, decommissioning, operation, maintenance, renovation, extension and other associated works.
This European Standard does not apply to the materials, design, construction, testing and commissioning of gas infrastructures in use prior to the publication of this European Standard. However, this European Standard does apply to the operation, maintenance, renovation and extension of all gas infrastructures.
Specific functional requirements for polyethylene pipelines are given in EN 12007-2, for steel pipelines in EN 12007-3 and for the renovation of pipelines in EN 12007-4. Functional recommendations for pipework for buildings are given in EN 1775. Functional requirements for service lines are given in prEN 12007-5.
Functional requirements for pressure testing, commissioning and decommissioning are given in EN 12327.
Functional requirements for measuring systems are given in EN 1776.
Functional requirements for pressure regulating stations are given in EN 12186.
Functional requirements for pressure regulating installations are given in EN 12279.
Functional requirements for gas transmission are given in EN 1594.
This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries. This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation should take precedence as illustrated in FprCEN/TR 13737-1.
FprCEN/TR 13737-1 gives:
-   clarification of all legislations/regulations applicable in a member state;
-   if appropriate, more restrictive national requirements;
-   a national contact point for the latest information.

This European Standard describes specific functional requirements for the renovation of pipework in existing gas infrastructures. This European Standard is intended to be applied with the requirements of EN 12007-1.
This European Standard does not apply to pipework in above ground installations.
This European Standard covers the various renovation technologies for gas piping in the range of sizes covering gas mains and gas service lines and is intended to be applied in association with EN 12007-1. Certain pipe networks originally for other purposes can be considered for renovation technologies to make them suitable for gas infrastructure.
This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries. This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation should take precedence as illustrated in FprCEN/TR 13737-1.
FprCEN/TR 13737-1 gives:
-   clarification of all legislations/regulations applicable in a member state;
-   if appropriate, more restrictive national requirements;
-   a national contact point for the latest information.

This European Standard describes common principles for pressure testing, commissioning and decommissioning of gas infrastructures as covered by the functional European Standards of the Technical Committee CEN/TC 234, see Annex B. They have been extracted from the detailed codes of practice and operating manuals in the member countries.
This European Standard does not cover installation pipework which is covered by EN 1775.
The specified procedures are applicable to strength testing, tightness testing and combined testing. Test pressure levels, test periods and acceptance criteria are not covered by this European Standard.
Additional measures or different methods of testing, commissioning or decommissioning can be required by legislation of the individual member countries or at the discretion of the pipeline operator.
This European Standard specifies common basic principles for gas infrastructure.  Users of this European Standard should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation should take precedence as illustrated in CEN/TR 13737.
CEN/TR 13737 gives:
- clarification of all legislations/regulations applicable in a member state;
- if appropriate, more restrictive national requirements;
- a national contact point for the latest information.

The gas supply companies, in the widest sense of their activities (production, transport, distribution), have a long tradition in ensuring that networks and facilities are operated according to well-defined procedures. These procedures are the centrepiece of quality management systems. They are based on the general criteria of the series ISO 9000 and are currently being developed gas-specifically as EQAS (European Quality Assurance System) in CEN/TC 234 in order to adhere more efficiently to the procedures peculiar to the gas activities. Companies are more and more inclined to take into account environmental aspects, since the series ISO 14000 resulting in EMAS (Environment Management System) have a similar structure, and the measures to be taken are directly linked to the technical operations and therefore cannot be dissociated from them.
Environmental issues are expected to feature increasingly in CEN standardisation as the European Commission and its affiliated Member States press ahead with an array of proposals for potential directives. These directives are aimed at boosting the reduction of energy consumption, reducing emissions to air/water and, more generally, at forcing industry to consider any process which may have adverse impacts on the environment.
The CEN Sector Forum Gas Infrastructure (CEN/SFG_I) will take this opportunity to demonstrate through EQAS, the effectiveness of gas companies in this area who are continuously looking for the best technologies (although natural gas is by nature an environmentally friendly energy in comparison with other fossil fuels).
Environmental guides are other tools which CEN has introduced through its Technical Board Resolution C108/2000, by requesting the sector forums and their attached Technical Committees to implement the European Commission policy regarding standardisation.
This Technical Report, intended to be used when drafting or reviewing the standards of CEN/TC 234, does not claim to either lay down dedicated requirements for each operation described in each standard nor to set limit values (e.g. emissions) that would be the specific task of the experts in the working group concerned.
Rather, it serves the purpose of triggering an in-depth reflection on the environmental consequences whenever an operative action is planned or being executed. As a way of implementing the basic scheme it was agreed to accommodate the environmental indicators (EIs marked a to i) in the fields of Table 1 (numbered 1 to 49) which match operations/processes with installation/plant. For each field of the Table referenced then by a number and letters, the corresponding requirements are precisely described in Table 2 "Gas-specific Environmental Requirements".

This part of the Technical Report contains the definition of "Functional Standardisation" in the context of CEN/TC 234 and explains their relationship with relevant European Directives, national legislation and national standards.  
It is intended as a guideline for the national implementation of the functional European Standards elaborated by CEN/TC 234 "Gas infrastructure".

1.1   This standard specifies general recommendations for the design, construction, testing, commissioning, operation and maintenance of installation pipework; pipework between the delivery point of the gas and the inlet connection to the gas appliance.
This standard specifies common basic principles for gas installation pipework.
Users of this European standard need to be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.
This standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, national legislation/regulation takes precedence as illustrated in CEN /TR 13737.
NOTE 1   CEN/TR 13737 contains:   
   - clarification of relevant legislation/regulations applicable in a country;   
   - if appropriate, more restrictive national requirements;   
   - national contact point for the latest information.
This standard applies to:
-   gas installations in residential, commercial and public access building having a maximum operating pressure (MOP) less than or equal to 5 bar;
-   industrial gas installations having a maximum operating pressure (MOP) less than or equal to 0,5 bar.
NOTE 2   For industrial gas installations having a MOP above 0,5 bar, or installations having a MOP above 5 bar, see prEN 15001-1.
This standard is applicable to new installation pipework as well as to replacements of, or extensions to, existing installation pipework.
This standard does not contain detailed recommendations relating to the laying of buried pipework.
NOTE 3     For more information on buried pipework, see EN 12007-1, EN 12007-2 and EN 12007-3.
NOTE 4     For more information on gas pressure regulating installations, see EN 12279.
NOTE 5    For more information on gas metering systems, see EN

This European Standard contains the relevant functinal requirements for gas pressure regulating installations forming a part of the service lines in gas supply systems.

This European standard specifies gas quality characteristics, parameters and their limits, for gases classified as group H that are to be transmitted, injected into and from storages, distributed and utilized.
NOTE   For information on gas families and gas groups see EN 437.
This European standard does not cover gases conveyed on isolated networks.
For biomethane, additional requirements indicated in prEN 16723 1 apply.

This document specifies functional requirements for the design, construction, testing,
commissioning/decommissioning, operation, maintenance and where appropriate calibration, together with suitable documented provisions for all new gas measuring systems and any major changes of existing systems.
This document also specifies accuracy classes of measuring systems and thresholds applicable to these classes. Demonstration of compliance is achieved through the selection, installation and operation of appropriate measurement instruments, together with suitable documented provisions for calculations. Examples of demonstration of compliance are provided for each accuracy class; however, they are not prescriptive solutions.
This document is applicable for gases of the 2nd gas family as classified in EN 437 and for hydrogen and its blends with gases of the 2nd gas family. This document can also be used as a guideline for 1st and 3rd family gases as classified in EN 437; however additional considerations should be taken with regard to the different constituents and physical characteristics of the gas family.
This document is not applicable for:
- raw or sour gases.
- gas measurement in CNG and hydrogen fuelling stations.
This document gives guidelines when installing and operating gas meters with additional functionalities (smart meters).
Unless otherwise specified all pressures used in this document are gauge pressures.
For associated pressure regulating systems the requirements of EN 12186 and/or EN 12279 apply.
For requirements on design, housing, lay-out, materials for components, construction, ventilation, venting and overall safety of gas measuring systems within the scope of this document, EN 15001, EN 12186, EN 12279 and/or EN 1775 apply additionally, where relevant.
This document specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or codes of practice can exist in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, national legislation/regulation takes precedence as illustrated in CEN/TR 13737 parts 1 and 2.
CEN/TR 13737 (all parts) gives:
   clarification of all legislation/regulations applicable in a member state;
   if appropriate, more restrictive national requirements;
   a national contact point for the latest information.

This document describes the specific functional requirements for the design, construction, operation, maintenance and disposal activities for safe and secure gas compressor stations.
This document applies to new gas compressor stations with a Maximum Operating Pressure (MOP) over 16 bar and with a total shaft power over 1 MW. For existing compressor stations, this document applies to new compressor units. Where changes/modifications to existing installations or gas composition take place, due account can be taken of the requirements of this document.
This document does not apply to gas compressor stations or compressor units operating prior to the publication of this document. For existing sites this document can be used as guidance.
The purpose of this document is to:
—   ensure the health and safety of the public and all site personnel;
—   cover environmental issues;
—   avoid incidental damage to nearby property; and
—   open the gas infrastructure to accommodate renewable gases, including a possible design for hydrogen.
This document specifies common basic principles for the gas infrastructure. Users of this document are expected to be aware that more detailed national standards and/or codes of practice can exist in the CEN member countries.
This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts). CEN/TR 13737 (all parts) gives:
—   clarification of all legislations/regulations applicable in a member state;
—   if appropriate, more restrictive national requirements;
—   a national contact point for the latest information.
This document does not apply to:
—   off-shore gas compressor stations;
—   gas compressor stations for compressed gas filling-stations;
—   customer installations downstream of the point of custody transfer;
—   design and construction of driver packages (see Annex C);
—   mobile compressor equipment.
For supplies to utility services such as small central heating boilers reference is made to EN 1775.
Figure 1 shows a schematic representation of compressor stations in a gas infrastructure. For further information refer to Annexes A, B, C, D, E and F.
[Figure 1]

This document describes a methodology to identify different types of methane emissions from the gas infrastructure and it explains, step by step, how to quantify each type of emission in a gas transmission, distribution and/or storage system and in an LNG terminal. Gas is considered any product with a high methane content  that is in gaseous form inside the respective gas infrastructure (e.g. natural gas, biogas or mixtures thereof with each other or with hydrogen).
Note of the editors: The inclusion of methane emissions in LNG terminals in the prTS is in clarification with CEN/TC 282. A Mode 4 cooperation has been established by CEN/TC 234 for this purpose.
Methane emission from utilisation, CNG/LNG fuelling stations, biomethane production and upgrading plants and LNG liquefaction and transport are not covered in this document, except if they are inside the covered asset (see Annex I on granularity).
NOTE 1: These principles can also be applied to other parts of the gas value chain.
The document specifies a bottom-up method of quantification of identified methane sources.
This quantification method requires splitting the gas systems into groups of assets, devices and components and indicating categories of emission that can be expected from these groups to determine the emission factors (EF) and the activity factors (AF).
Finally, a general method to calculate the uncertainties associated with the quantified amounts of emitted methane is described.
NOTE 2: Part of the methods of this document are retrieved by an international research program initiated by GERG for DSO.

This document amends prEN 12732 Clause 4.5 "Testing companies and personnel".

This standard specifies detailed functional requirements for the design, selection of materials, construction, inspection and testing of industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of non-industrial gas installations with an operating pressure greater than 5 bar in buildings and areas intended for domestic, commercial, public and mixed uses, starting from the gas supplier's behind the network operator's point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This standard also covers the inlet connection to the gas appliance comprising of the pipework that does not fall within the scope of the appliance standard.
This standard applies to gas installations operating at ambient temperatures between -20°C and 40°C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should be made to EN 13480 for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non-industrial (domestic and commercial) gas installations up to and including 5 bar in buildings and areas intended for domestic, commercial, public and mixed use, EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European standards, this standard applies.
In this standard, the term "gas" refers to combustible gases, which are gaseous at 15°C and 1 013 mbar absolute atmospheric pressure. These gases are commonly referred to as manufactured gas, natural gas or Liquidfied Petroleum Gas (LPG). They are also referred to as first, second or third family gases (see table 1 of EN 437:1993).
LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure.
In this standard, all pressures are gauge pressures unless otherwise stated.
This standard has been harmon

This European standard specifies detailed functional requirements for the commissioning, operation and maintenance of industrial gas installations operating above 0,5 bar and domestic or commercial gas installations above 5 bar. For non-industrial [domestic and commercial] gas installations up to 5 bar, EN 1775 applies.
This European standard also applies to gas installations up to 5 bar not within the scope of EN 1775 or other European standards, as well as to mixed installations [industrial and non-industrial].
The inlet connection to the appliance is normally the inlet isolation valve but can include the pipework downstream of this valve- if this pipework is not covered by the appliance standard, then this standard applies.
The requirements for design, materials, construction, inspection and testing of gas installations over 0,5 bar and domestic or commercial gas installations over 5 bar are given in part 1 (WI 00234026) of this standard.
In this standard the term 'gas' refers to combustible gases, which are gaseous at 15 °C and 1,013 mbar absolute pressure.  These gases, are commonly referred to as manufactured gas, natural gas or liquid petroleum gases (LPG). They are also referred to as first, second or third family gases (see table 1 of EN 437: 1993).
LPG storage tanks (including all ancillaries fitted directly to the tanks) are excluded see prEN 14570.  Also excluded are LPG installations and sections of LPG installations operating at vapour pressure.
In this standard, all pressures are gauge pressures unless otherwise stated.

This document describes the specific functional requirements for the design, construction, operation, maintenance and disposal activities for safe and secure gas compressor stations.
This document applies to new gas compressor stations with a Maximum Operating Pressure (MOP) over 16 bar and with a total shaft power over 1 MW. For existing compressor stations, this document applies to new compressor units. Where changes/modifications to existing installations or gas composition take place, due account can be taken of the requirements of this document.
This document does not apply to gas compressor stations or compressor units operating prior to the publication of this document. For existing sites this document can be used as guidance.
The purpose of this document is to:
—   ensure the health and safety of the public and all site personnel;
—   cover environmental issues;
—   avoid incidental damage to nearby property; and
—   open the gas infrastructure to accommodate renewable gases, including a possible design for hydrogen.
This document specifies common basic principles for the gas infrastructure. Users of this document are expected to be aware that more detailed national standards and/or codes of practice can exist in the CEN member countries.
This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this document, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts). CEN/TR 13737 (all parts) gives:
—   clarification of all legislations/regulations applicable in a member state;
—   if appropriate, more restrictive national requirements;
—   a national contact point for the latest information.
This document does not apply to:
—   off-shore gas compressor stations;
—   gas compressor stations for compressed gas filling-stations;
—   customer installations downstream of the point of custody transfer;
—   design and construction of driver packages (see Annex C);
—   mobile compressor equipment.
For supplies to utility services such as small central heating boilers reference is made to EN 1775.
Figure 1 shows a schematic representation of compressor stations in a gas infrastructure. For further information refer to Annexes A, B, C, D, E and F.
[Figure 1]

This European Standard describes the specific functional requirements for service lines in addition to the general functional requirements of EN 12007-1 for:
a)   a maximum operating pressure (MOP) up to and including 16 bar;
b)   an operating temperature between -20 °C and +40 °C.
It applies to their design, construction, commissioning, decommissioning, operation, maintenance, extension and other associated works. The service line is the physical asset comprising of pipework from the gas main branch saddle or top tee to the outlet of the distribution system operator’s nominated point(s) of delivery (for example: isolation valve, regulator, meter connection or combination of regulator and isolation valve).
The ownership and operation responsibility can vary between member states. The extent of the service line can differ in each member state. To illustrate this, the various points of deliveries are indicated in Figure 1. Consult Figure 1 (A/B/C/D/E) and member state regulations and standards.
NOTE   The valve at point A is not necessarily utilised by each member state.
National preference for points of deliveries should be stated in the national foreword.
Specific functional requirements for:
—   polyethylene pipelines are given in EN 12007-2.
—   steel pipelines are given in EN 12007-3.
—   pipework for buildings are given in EN 1775.
—   pressure regulating installations are given in EN 12279 or EN 12186.
—   pressure testing, commissioning and decommissioning are given in EN 12327.
This European Standard represents the recommendations at the time of its preparation. It does not apply retrospectively to installations before the publication date unless specifically stated.
This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or code of practice may exist in the CEN member countries. This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
CEN/TR 13737 (all parts) gives:
—   clarification of all legislations/regulations applicable in a member state;
—   if appropriate, more restrictive national requirements;
—   a national contact point for the latest information.

This European Standard is applicable to pipelines with a maximum operating pressure (MOP) over 16 bar for the carriage of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 in onland gas infrastructure.
This European Standard is also applicable to pipelines with a maximum operating pressure (MOP) over 16 bar for the carriage of non-conventional gases such as injected biomethane, complying with EN ISO 13686 and for which a detailed technical evaluation of the functional requirements is performed ensuring there are no other constituents or properties of the gases that can affect the integrity of the pipeline.
Onland gas infrastructure is where:
-   pipeline elements are made of unalloyed or low-alloyed carbon steel;
-   pipeline elements are joined by welds, flanges or mechanical couplings;
-   the pipeline is not located within commercial or industrial premises as an integral part of the industrial process on these premises except for any pipelines and facilities supplying such premises;
-   the design temperature of the system is between −40 °C and 120 °C inclusive.
This European Standard applies to onshore pipeline systems from the point where the pipeline first crosses what is normally accepted as battery limit between on and offshore, e.g.:
-   first isolation valve;
-   the base of steep sea shelf;
-   above the high water/low water mark onto mainland;
-   an island.
This European Standard also applies to a pipeline system with a starting point onshore, also when parts of the pipeline system on the mainland subsequently cross fjords, lakes etc.
This European Standard does not apply to existing pipelines, in use prior to the publication of this European Standard, nor to modifications to existing pipelines.
Gas infrastructures covered by this European Standard begin after the gas producer's metering station. The functional demarcation of the pipeline system within a plant area will be determined from case to case. Generally speaking, this will be directly after the first isolating valve of the installation.
This European Standard also describes the mechanical requirements for pipework in stations with a maximum operating pressure greater than 16 bar. Welding requirements are described in a special application standard on welding for gas infrastructures EN 12732. Functional requirements for stations are given in:
-   EN 1776, Gas supply systems — Natural gas measuring stations — Functional requirements
-   EN 1918 5, Gas supply systems — Underground gas storage — Part 5: Functional recommendations for surface facilities
-   EN 12186, Gas supply systems — Gas pressure regulating stations for transmission and distribution — Functional requirements
-   EN 12583, Gas supply systems — Compressor stations — Functional requirements
This European Standard specifies common basic principles for gas infrastructures. Users of this European Standard should be aware that there may exist more detailed national standards and codes of practice in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned principles.
In the event of conflicts in terms of more restrictive requirements in the national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.
Reference is made in this European Standard to relevant European and other recognised standards for products used to construct and operate gas infrastructures.
A schematic representation of pipelines for gas transmission is given in Figure 1.

This Technical Report gives explanation on the pressure definitions used by the gas network operators with regard to the standards of CEN/TC 234 "Gas Infrastructure".
The European Standards of CEN/TC 234 comprise the functional requirements in the field of gas infrastructure from the input of gas into the on-shore transmission network up to the inlet connection of gas appliances, including transmission, distribution, storage, compression, pressure regulation and metering, installation, injection of non-conventional gases, gas quality issues and others.

This standard specifies detailed functional requirements for the design, selection of materials, construction, inspection and testing of
   industrial gas installation pipework and assemblies with an operating pressure greater than 0,5 bar, and
   non industrial gas installation pipework (residential and commercial) with an operating pressure greater than 5 bar in buildings,
starting from the outlet of the network operator’s point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This standard also covers the inlet connection to the gas appliance comprising of the pipework that does not fall within the scope of the appliance standard.
NOTE   The use of the term installation and pipework is interchangeable.
This standard applies to gas installations operating at ambient temperatures between - 20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should additionally be made to EN 13480 for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non industrial (residential and commercial) gas installations up to and including 5 bar in buildings, EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European Standards, this standard applies.
In this standard, the term “gas“ refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure (normal conditions). These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases (see Table 1 of EN 437:2003). The given values are considered as normal conditions for all volumes given in this standard.

This European Standard specifies detailed functional requirements for the commissioning, operation and maintenance of
•   industrial gas installations and assemblies with an operating pressure greater than 0,5 bar and of
•   non-industrial installations (residential and commercial) with an operating pressure greater than 5 bar,
starting from the outlet of the network operator’s point of delivery up to the inlet connection to the gas appliance; normally the inlet isolation valve. This European Standard also covers the inlet connection to the gas appliance comprising of the pipework that does not fall within the scope of the appliance standard.
This standard applies to gas installations operating at ambient temperatures between –20 °C and 40 °C and operating pressures up to and including 60 bar. For operating conditions outside these limitations, reference should additionally be made to EN 13480 for metallic pipework.
For industrial gas installations up to and including 0,5 bar and for non-industrial (residential and commercial) gas installations up to and including 5 bar EN 1775 applies.
For gas installations that do not fall within the scope of EN 1775 or other European Standards, this European Standard applies.
In this European Standard, the term “gas“ refers to combustible gases, which are gaseous at 15 °C and 1 013 mbar absolute atmospheric pressure. These gases are commonly referred to as manufactured gas, natural gas or Liquefied Petroleum Gas (LPG). They are also referred to as first, second or third family gases (see table 1 of EN 437:2003).
LPG storage vessels (including all ancillaries fitted directly to storage vessels) are excluded. Also excluded are LPG installations and sections of LPG installations operating at vapour pressure (e.g. between the storage vessel and its pressure regulator).
In this European Standard, all pressures are gauge pressures unless otherwise stated.
For gas installations within the scope of this standard, national legisl

This document specifies requirements on the development and implementation of a safety management system for operators of a gas network with a maximum operating pressure up to and including 16 bar according to EN 12007 (all parts).
This document refers to all activities and processes related to safety aspects and performed by gas operators of a gas network with a maximum operating pressure up to and including 16 bar, including those activities entrusted to contractors. It includes safety-related provisions on operation of the gas network.
The described safety management system is applicable to infrastructure for the distribution of processed, non-toxic and non-corrosive gas of the 2nd gas family as classified in EN 437, including injected gases from non-conventional sources.
NOTE 1   Gases from non-conventional resources can be bio methane, hydrogen, shale gas, synthetic gases and others.
This document can also apply for gas infrastructure conveying only gases from non-conventional sources, such as bio methane grids or gases of the 3rd family as classified in EN 437.
For safety management and pipeline integrity management systems of gas networks with a maximum operating pressure above 16 bar generally EN 16348 applies.
NOTE 2   If minor sections of the gas network are operated with a maximum operating pressure above 16 bar, these can also be managed by an SMS according to this document. For the pipeline integrity management EN 16348 applies.
NOTE 3   If minor sections of a gas transmission network are operated with a maximum operating pressure up to and including 16 bar, this document or EN 16348 can be applied. In any case, for the pipeline integrity management system EN 16348 applies.
Specific requirements for occupational health and safety are excluded from this document. National legislation and other European and/or international standards, e.g. OHSAS 18001, apply.
This document specifies common basic principles for gas infrastructure. It is important that users of this standard are aware that more detailed national standards and/or code of practice may exist in the CEN member countries. This document is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE 4   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.

This European Standard specifies requirements which enable a Transmission System Operator (TSO) to develop and implement a safety management system including an integrity management system specifically for pipelines.
The SMS is applicable to infrastructure for the transmission of processed, non-toxic and non-corrosive natural gas according to EN ISO 13686 and injected bio methane, where:
-   the pipeline elements are made of unalloyed or low-alloyed carbon steel;
-   the pipeline elements are joined by welds, flanges or mechanical joints.
NOTE 1   In this standard, the term 'natural gas' includes injected bio methane or other non-conventional forms of natural gas, e.g. shale gas.
Gas infrastructures for the transmission of natural gas covered by this standard are:
-   pipelines onshore including valve stations;
-   compressor stations;
-   measuring and pressure reduction stations.
Gas distribution assets as well as LNG plants, terminals, underground storages are excluded from the scope of this standard.
Occupational health and safety is excluded from this European standard because it is covered by national legislation and other European and/or international standards, e.g. OHSAS 18001.
This European standard specifies requirements on a general level. The referenced documents given in Clause 2 'Normative references' give more detailed requirements for some of the assets listed above.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).
NOTE 2   CEN/TR 13737 (all parts) contains:
-   clarification of relevant legislation/regulations applicable in a country;
-   if appropriate, more restrictive national requirements;
-   national contact point for the latest information.

This European Standard describes the specific functional requirements for the design, construction, operation, maintenance and disposal activities for safe and secure gas compressor stations.
This European Standard applies to new gas compressor stations with a Maximum Operating Pressure (MOP) over 16 bar and with a total shaft power over 1 MW. For existing compressor stations, this European Standard applies to new compressor units. Where changes/modifications to existing installations take place, due account may be taken of the requirements of this European Standard.
This European Standard does not apply to gas compressor stations operating prior to the publication of this European Standard.
The purpose of this European Standard is intended to:
-   ensure the health and safety of the public and all site personnel,
-   to cover environmental issues and
-   to avoid incidental damage to nearby property.
This European Standard specifies common basic principles for the gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.
This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above-mentioned basic principles.
In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737. CEN/TR 13737 gives:
-   clarification of all legislations/regulations applicable in a member state;
-   if appropriate, more restrictive national requirements;
-   a national contact point for the latest information.
This European Standard does not apply to:
-   off-shore gas compressor stations;
-   gas compressor stations for compressed natural gas filling-stations;
-   customer installations downstream of the point of custody transfer;
-   design and construction of driver packages (see Annex C).
For supplies to utility services such as small central heating boilers reference should be made to EN 1775.
Figure 1 shows a schematic representation of compressor stations in a gas infrastructure.

This document amends prEN 12732 Clause 4.5 "Testing companies and personnel".