CEN/TC 74 - Flanges and their joints

This document defines a calculation method for bolted, gasketed, circular flange joints. Its purpose is to ensure structural integrity and control of leak tightness. It uses gasket parameters based on definitions and test methods specified in EN 13555:2014.
The calculation method is not applicable to joints with a metallic contact out of the sealing face or to joints whose rigidity varies appreciably across gasket width. For gaskets in incompressible materials, which permit large deformations, the results given by the calculation method can be excessively conservative (i.e. required bolting load too high, allowable pressure of the fluid too low, required flange thickness too large, etc.).

This document specifies the dimensions, types, designation and marking of non-metallic flat gaskets, with or without inserts, for flanges in accordance with EN 1759-1, EN 1759-3 and EN 1759-4, for Class 150, Class 300, Class 600 and Class 900 for nominal sizes DN 15 to DN 600. In addition, this document also gives guidance on typical materials used and how they should be marked.

This document specifies non-metallic flat gaskets, with or without inserts, for use with flanges in accordance with EN 1092-1, EN 1092-2, EN 1092-3 and EN 1092-4, and pipes and fittings in accordance with EN 545, EN 598, and EN 969, for pressure application up to and including PN 63 values and dimensions up to and including DN 4000. In addition, this document also gives guidance on typical materials used and how they should be marked.

This document specifies requirements for circular flanges made from ductile, grey and malleable cast iron for DN 10 to DN 4000 and PN 2,5 to PN 100. See 4.1 and 4.2 for information regarding allowed DN and PN.
This document specifies the types of flanges and their facings, dimension and tolerances, bolt sizes, surface finish of jointing faces, marking, testing, quality assurance and materials together with associated pressure/temperature (p/T) ratings.

This document is applicable to the selection of bolting for flanged joints on equipment subject to the Pressure Equipment Directive 2014/68/EU.
It specifies standards and additional requirements for dimensions, material properties and technical conditions of delivery for bolting.
NOTE 1   Washers are not within the scope of this document.
The selection is based on commonly used bolting. It covers common temperature ranges of the general service of flanges.
When selecting bolting according to this document it is essential to take into account environmental conditions and other parameters including type of fluids, corrosion hazards, sour service, low temperature brittle failure and relaxation at elevated temperatures.
The purpose of this document is to provide a selection of most commonly used bolting types and bolting material combinations.
It is not the intention to specify all possible applications but to give guidance on the most common applications. For example, application limits for material in the creep range are not explicitly covered in this document. Where material standard provides mechanical properties for the creep range respective reference is made in Table 3.
NOTE 2   Special services and ambient conditions may require the application of coatings. It is the purchaser’s option to decide on this. Depending on the coating used, a verification of the temperature ranges given in Table 3 and Table 4 may be required.
NOTE 3   In Annex B there are bolting types and bolting material combinations according to commonly used national standards other than those listed in Table 2, Table 3 and Table 4.

This document is applicable to the selection of bolting for flanged joints on equipment subject to the Pressure Equipment Directive 2014/68/EU.
It specifies standards and additional requirements for dimensions, material properties and technical conditions of delivery for bolting.
NOTE 1   Washers are not within the scope of this document.
The selection is based on commonly used bolting. It covers common temperature ranges of the general service of flanges.
When selecting bolting according to this document it is essential to take into account environmental conditions and other parameters including type of fluids, corrosion hazards, sour service, low temperature brittle failure and relaxation at elevated temperatures.
The purpose of this document is to provide a selection of most commonly used bolting types and bolting material combinations.
It is not the intention to specify all possible applications but to give guidance on the most common applications. For example, application limits for material in the creep range are not explicitly covered in this document. Where material standard provides mechanical properties for the creep range respective reference is made in Table 3.
NOTE 2   Special services and ambient conditions may require the application of coatings. It is the purchaser’s option to decide on this. Depending on the coating used, a verification of the temperature ranges given in Table 3 and Table 4 may be required.
NOTE 3   In Annex B there are bolting types and bolting material combinations according to commonly used national standards other than those listed in Table 2, Table 3 and Table 4.

This document specifies the gasket parameters required by EN 1591-1 and provides the test procedures for establishing the values of these parameters.
Gaskets which are wholly based upon elastomers, or based upon elastomers with only the inclusion of particulate fillers or particulate reinforcement, as opposed to gaskets combining elastomers, fillers and fibrous reinforcement, are beyond the scope of this document.
NOTE The testing procedures given might be applicable to gaskets of other shapes and dimensions.

This part of EN 1514 specifies the dimensions and marking of spiral wound gaskets for use in conjunction with flat face and raised face flanges complying with the requirements of EN 1092-1 for PN 10, PN 16, PN 25, PN 40, PN 63, PN 100 and PN 160 and up to and including DN 1 000.
NOTE 1   Dimensions of other types of gaskets for use with flanges to EN 1092-1, EN 1092-2, EN 1092-3 and EN 1092 4 are given in EN 1514-1, EN 1514-3, EN 1514-4, EN 1514-6, EN 1514-7 and EN 1514-8.
NOTE 2   Annex A lists information to be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the manufacturer.

This document specifies the quality assurance procedures that are applicable to ensure that delivered gaskets comply with the relevant product standards. This document sets down procedures by which a user can have confidence that the salient features of each batch of gaskets or gasket materials delivered to them will be constant.
The gasket types covered by this document are those that are within the scope of the EN 1514 series and EN 12560 series and are simultaneously within the scope of the EN 1591 series. An exception is those gaskets intended solely for domestic fluids (like water, waste water ...) which are based on rubber with or without reinforcement like fillers and/or inserts.

This document details generic gasket parameters for use in EN 1591-1 during preliminary calculations during which the type of gasket to be used in an application is to be decided. Once the gasket type has been decided the parameters for gaskets of that type from the different potential commercial suppliers should be used in further calculations as within a gasket type there will be differences depending upon the supplier.
WARNING - For the final calculations using the method given in EN 1591-1 the reader is directed to obtain gasket parameters for the selected generic type of gasket from the intended gasket manufacturer. This is because the data for a generic gasket type will vary between manufacturers. This variation can be seen in the tables of data which are embodied in this document.

This European Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000.
This European Standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses.
For the purpose of this European Standard, "flanges" include also lapped ends and collars.
This European Standard applies to flanges manufactured in accordance with the methods described in Table 1.
Non-gasketed pipe joints are outside the scope of this European Standard.

This European Standard specifies the dimensions, design, types, designation, materials and marking of spiral wound gaskets for use with type A flat face or type B raised face flange facings complying with EN 1759-1 for the following Class designations:
-   Class 150, to Class 1 500 for nominal sizes DN 15 to DN 600, and
-   Class designation 2 500 up to and including DN 300.
The centering rings for the spiral wound gaskets according to this standard are sized for use with imperial bolting.
The dimensions of spiral wound gaskets for tongue and groove flange facing types and spigot and recess flange facing types to EN 1759-1 are not included in this standard.
Such gaskets may be available, however, for these types of flange and the purchaser is advised to consult the manufacturer as to their availability. Similarly, for slip-on or screwed flange types, the manufacturer should be consulted about availability.
NOTE   Dimensions of other types of gasket for use with flanges complying with the requirements of EN 1759-1 are given in EN 12560-1, EN 12560-3, EN 12560-4 and EN 12560-5, EN 12560-6 and EN 12560-7.

This European Standard is applicable to the bolting technicians, and their supervisors, the responsible engineers, who disassemble, assemble and tighten the bolted connections of whatever shape of critical service pressurised systems. A failure of a connection in such a system would endanger personnel, plant or the environment. A route for achieving competency in the skills required to safely and successfully disassemble, assemble and tighten pressurised bolted joints of any shape to a design bolt load using documented work instructions is given in this document. The aim is the establishment of a joint capable of maintaining a leak-free status throughout its’ service life.
This European Standard provides a modular training syllabus and an assessment process that can be used to determine the competency of personnel who disassemble, assemble and tighten bolted connections, whatever their shape, fitted to pressurised equipment containing a medium at any combination of temperature and pressure.
Bolting technicians have to assemble bolted connections of different levels of complexity. For this reason, training matrices dealing with bolted connections of various levels of complexity and for different types of pressurised bolted connections are given in this document. The modular structure created allows a bolting technician, once competency in the foundation level has been achieved, to obtain competency in higher levels as required.
Certification to this European Standard provides an attestation of general competency in accordance with the stated syllabi and assessments.
Certification to this European Standard does not represent an authorisation to operate, since this remains the responsibility of the employer, and the certified person may require additional specialised knowledge of employer-specific procedures, processes and equipment.

This Technical Report gives guidance for the calculation of full face gasketed joints on the basis of the calculation method given in EN 1591-1.

2010-11-05 EMA: WI allocated to WG 4 following resolution 291 taken on 2010-10-21.
TC - Modification in Table 6, dimensions of PN 10 flanges, DN 40: change of pitch circle diameter according to resolution CEN/TC 74 260/2006
NOTE   The first Corrigendum EN 1092:2003/AC:2004, WI 00074C01 has been published as full text with the following sentence in the Foreword: "Due to the incorrect hatching, all figures were replaced.". Merging the full text plus instruction of the first Corrigendum with the instruction of the second Corrigendum was not possible. That is why it has been decided to merge only the instructions of the first and second Corrigenda into one new Corrigendum. Jens, 2007-07-23

The aim of this Technical Specification is to describe a calculation method dedicated to Bolted Flange Connections (BFC) with metal to metal contact (MMC). It is dedicated to BFC where MMC occurs in a region between the outside diameter of the gasket and the inside diameter of the bolt hole region. For MMC inside the gasket and for MMC outside the bolt hole region, the present method is not appropriate.
The calculation method proposed in this Technical Specification is mainly based on the method described in EN 1591-1, dedicated to floating type BFC. The behaviour of the complete flanges-bolts-gasket system is considered. In assembly condition as well as for all the subsequent load conditions, the BFC components are maintained together by internal forces. This leads to deformations and forces balances (see Annex F) which gives the basic relations between the forces variations in the BFC.
The calculation of BFC with MMC leads to the consideration of an additional force compared to the EN 1591-1 calculation method: the reaction force in the MMC area. It explains why two compliance equations are required in this Technical Specification (in the EN 1591-1 calculation method just one compliance equation is needed to determine the internal forces in all the load conditions).
Unlike EN 1591-1 where the internal forces variations are determined with the compliance relation between the assembly and the considered load condition, here, the internal forces variations are determined by using the compliance relations between two consecutive load conditions.
This method does not treat non-gasketed pipe joints.
1.1   Requirement for use of the Method
Where permitted, the Method is an alternative to design validation by other means e.g.
-   special testing;
-   proven practice.
-   Use of standard flanges within permitted conditions
1.2   Geometry
The Method is applicable to the configurations having:
-   flanges whose section is given or may be assimilated to those given in Figures

This European Standard gives the definition of PN when applied to components of a pipework system, as specified in those standards which use the PN designation system.
This standard specifies the PN numbers which are used.

This European Standard covers the classification of bolt materials used in combination with steel flanges ac-cording to EN 1759-1 (Class designated).
Bolt materials are listed in EN 1515-1; flange material groups are listed in EN 1759-1.

This European Standard specifies dimensions, tolerances, materials, P/T ratings and technical conditions of delivery for steel flanges with bore size DN 15 to DN 600, Class designated; based on ANSI-B 16.5-1988 + Addenda 1992.

This document specifies the dimensions of polymeric O-Ring gaskets for use with grooved flanges complying with EN 1092 for PN 10, PN 16, PN 25, PN 40.
NOTE 1   Dimensions of other types of gaskets for use with flanges to EN 1092 1, EN 1092 2, EN 1092 3 and EN 1092 4 are given in EN 1514 1, EN 1514 2, EN 1514 3, EN 1514 4, EN 1514-6 and EN 1514-7
NOTE 2   Annex A lists information that should be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the supplier.

This European Standard specifies the construction, dimensions and marking of covered serrated metal jacketed gaskets for use with flanges complying with prEN 1759 1 for Class 150, Class 300, Class 600, Class 900. Class 1 500 for sizes up to and including NPS 24, and for Class designation 2 500 up to and including NPS 12.
This European Standard does not extend to covered metal jacketed based heat exchanger gaskets with pass bars or large vessel gaskets but, in the lack of a dedicated document for such gaskets, the principles set down may be applied to them.
NOTE 1   Dimensions of other types of gaskets for use with flanges to prEN 1759 1, EN 1759 3 and EN 1759 4 are given in EN 12560 1, EN 12560 2, EN 12560 3, EN 12560 4, EN 12560 5 and EN 12560 6.
NOTE 2   Annex A lists information that should be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the supplier.

This European Standard specifies the construction, dimensions and marking of covered serrated metal jacketed gaskets for use with flanges complying with EN 1092-1 for PN 2,5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63 and PN 100 up to and including DN 900.
This European Standard does not extend to covered metal jacketed based heat exchanger gaskets with pass bars or large vessel gaskets but, in the lack of a dedicated document for such gaskets, the principles set down may be applied to them.
NOTE 1   Dimensions of other types of gaskets for use with flanges to EN 1092-1, EN 1092-2, EN 1092-3 and EN 1092-4 are given in EN 1514-1, EN 1514-2, EN 1514-3, EN 1514-4, EN 1514-6 and prEN 1514-8.
NOTE 2   Annex A lists information that should be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the supplier.

This European Standard specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in Class designations Class 150 and Class 300 and nominal sizes from DN 10 to DN 900 (NPS ½ to NPS 36) in the types shown in Table 1.
This standard also specifies dimensions and tolerances, materials and their associated pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs and marking together with information on bolting, gaskets, application and installation and approximate flange masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or copper alloy tubes in accordance with EN 12449.
NOTE 1   The size of copper and copper alloy tubes is designated by reference to the outside diameter in millimetres.
NOTE 2   See also annex B.
NOTE 3   Non-gasketed pipe joints are outside the scope of this standard.

This European Standard specifies the construction, dimensions and marking of covered serrated metal gaskets for use with flanges complying with EN 1092-1 for PN 10, PN 16, PN 25, PN 40, PN 63 and PN 100 up to and including DN 3000.
This document does not extend to covered serrated metal based heat exchanger gaskets with pass bars or large vessel gaskets but, in the lack of a dedicated document for such gaskets, the principles set down can be applied to them.
NOTE 1   Dimensions of other types of gaskets for use with flanges to EN 1092-1, EN 1092-2, prEN 1092-3 and EN 1092-4 are given in EN 1514-1, EN 1514-2, EN 1514-3, EN 1514-4, prEN 1514-7 and prEN 1514-8.
NOTE 2   Annex A lists information that should be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the supplier.

This European Standard specifies the construction, dimensions and marking of covered serrated metal gaskets for use with flanges complying with prEN 1759-1 for Class 150, Class 300, Class 600, Class 900, Class 1500 and Class 2500 up to and including NPS 24.
This document does not extend to serrated covered metal based heat exchanger gaskets with pass bars or large vessel gaskets but, in the lack of a dedicated document for such gaskets, the principles set down can be applied to them.
NOTE 1   Dimensions of other types of gaskets for use with flanges to prEN 1759-1, prEN 1759-3 and prEN 1759-4 are given in EN 12560-1, EN 12560-2, EN 12560-3, EN 12560-4, EN 12560- 5 and prEN 12560-7.
NOTE 2   Annex A lists information that should be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the supplier.

This European Standard specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in Class designations Class 150 and Class 300 and nominal sizes from DN 10 to DN 900 (NPS ½ to NPS 36) in the types shown in Table 1.
This standard also specifies dimensions and tolerances, materials and their associated pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs and marking together with information on bolting, gaskets, application and installation and approximate flange masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or copper alloy tubes in accordance with EN 12449.
NOTE 1   The size of copper and copper alloy tubes is designated by reference to the outside diameter in millimetres.
NOTE 2   See also annex B.
NOTE 3   Non-gasketed pipe joints are outside the scope of this standard.

This European Standard specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in PN designations from PN 6 to PN 40 and nominal sizes from DN 10 to DN 1800 in the types shown in Table 1.
This standard also specifies dimensions and tolerances, materials and their associated pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs, and marking, together with information on bolting, gaskets, application/installation and approximate flange masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or copper alloy tubes in accordance with EN 12449.
NOTE 1   When the flanges specified in this standard are required for use with copper or copper alloy tubes to EN 1057 in those tube diameters which are different to EN 12449, this should be agreed between the equipment manufacturer and the flange manufacturer.
NOTE 2   The size of copper and copper alloy tubes is designated by reference to the outside diameter in millimetres.
NOTE 3   See also annex B.
NOTE 4   Non-gasketed pipe joints are outside the scope of this standard.

This European standard specifies requirements for Class designated circular flanges for pipes, valves, fittings and accessories made from aluminium alloy in the range of DN 15 to DN 600 (NPS 1/2 to NPS 24) and Class 150 to Class 300 (see Table 1).
This standard specifies the types of flanges and their facings, dimensions and tolerances, bolt sizes, surface finish of jointing faces, marking and materials together with associated pressure temperature (p/T) ratings.
The flanges are intended to be used for piping as well as for pressure vessels.

This standard specifies requirements for PN designated circular flanges for pipes, valves, fittings and accessories made from aluminium alloy in the range of DN 15 to DN 600 and PN10 to PN 63 (see Table 1).
This standard specifies the types of flanges and their facings, dimensions and tolerances, bolt sizes, surface finish of jointing faces, marking and materials together with associated pressure/temperature (p/T) ratings.
The flanges are intended to be used for piping as well as for pressure vessels.

This European Standard covers the classification of bolt materials combination with the flange material groups of steel flanges prEN 1092-1 (PN-designated).
Bolt materials are listed in EN 1515-1, flange material groups are listed in prEN 1092-1.

This standard specifies the dimensions, types, design, materials and marking requirements of metallic ring-joint gaskets for use in conjunction with specific flange facings (type J) of flanges complying with EN 1759-1 for Class designations 150, 300, 600, 900 and 1500 for nominal size designations up to and including NPS 24 (DN600), and for Class designation 2500 up to and including NPS 12 (DN300).

This standard specifies the dimensions, types, design, materials and marking requirements of IBC (inside bolt circle) non-metallic PTFE envelope gaskets for use with flanges complying with EN 1759-1, EN 1759-3, EN 1759-4 for Class designation 150 and 300 for sizes up to and including NPS 24 (DN600).

This standard specifies the dimensions, types, design and marking requirements of corrugated, flat or grooved metallic filled metallic gaskets for use in conjunction with flanges complying with EN 1759-1 for Class designations 150, 300, 600, 900 and 1500 for sizes up to and including NPS 24 (DN600), and for Class designation 2500 for nominal size designations up to and including NPS 12 (DN300).

This European Standard is applicable to the selection of bolting for PN designated flanges in accordance with EN 1092 series and Class designated flanges in accordance with EN 1759 series. It specifies standards for dimensions, materials and technical conditions of delivery for bolts, stud bolts and nuts. The bolting of this standard is selected for the use together with the flanges EN 1092 series and EN 1759 series but not for general purpose. The selection of the materials is based on commonly used materials. It covers all pressure and temperature ranges of the general service of standard flanges.

This Report provides technical background information on EN 1591-1.

This standard specifies the dimensions and marking of IBC (inside bolt circle) non-metallic envelope gaskets for use with flanges complying with EN 1092 Parts 1, 2, 3, 4, for PN 6 up to and including PN 63, up to and including DN 600.

This standard specifies the dimensions and marking of IBC (inside bolt circle) corrugated, flat or grooved metallic and filled metallic gaskets for use in conjunction with flanges complying with EN 1092: Part 1 for PN 10, PN 16, PN 25,PN 40, PN 63 and PN 100, up to and including DN 900.

Cancels and replaces the first edition (1980). Gives the definition of DN (nominal size) when applied to components of a pipework system, as specified in those standards which use the DN designation system. Gives a list of preferred DN values.

This document gives background information for guidance to be used in conjunction with the calculation method for design rules for gasketed circular flange connections as specified in FprEN 1591-1:2024.
NOTE   References to formulae numbered in this document have a decimal format whilst those in FprEN 1591-1:2024 are indicated by whole numbers.

This European Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000.
This European Standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses.
For the purpose of this European Standard, "flanges" include also lapped ends and collars.
This European Standard applies to flanges manufactured in accordance with the methods described in Table 1.
Non-gasketed pipe joints are outside the scope of this European Standard.

This document specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in PN designations from PN 6 to PN 40 and nominal sizes from DN 10 to DN 1800 in the types shown in Table 1.
This document also specifies dimensions and tolerances, materials and their associated pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs, and marking, together with information on bolting, gaskets, application/installation and approximate flange masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or copper alloy tubes in accordance with EN 12449.
NOTE 1   When the flanges specified in this document are required for use with copper or copper alloy tubes to EN 1057 in those tube diameters which are different to EN 12449, this should be agreed between the equipment manufacturer and the flange manufacturer.
NOTE 2   The size of copper and copper alloy tubes is designated by reference to the outside diameter in millimetres.
NOTE 3   See also Annex B.
NOTE 4   Non-gasketed pipe joints are outside the scope of this document.
Table 1 - Types of flanges and collars
[...table not represented...]

This European Standard specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in Class designations Class 150 and Class 300 and nominal sizes from DN 10 to DN 900 (NPS ½ to NPS 36) in the types shown in Table 1.
This standard also specifies dimensions and tolerances, materials and their associated pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs and marking together with information on bolting, gaskets, application and installation and approximate flange masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or copper alloy tubes in accordance with EN 12449.
NOTE 1   The size of copper and copper alloy tubes is designated by reference to the outside diameter in millimetres.
NOTE 2   See also Annex B.
NOTE 3   Non-gasketed pipe joints are outside the scope of this standard.
Table 1 - Types of flanges and collars [Table 1 and Figure 1 not represented]

This document specifies requirements for Class designated circular flanges for pipes, valves, fittings and accessories made from aluminium alloy in the range of DN 15 to DN 600 (NPS 1/2 to NPS 24) and Class 150 to Class 300 (see Table 1).
This document specifies the types of flanges and their facings, dimensions and tolerances, bolt sizes, surface finish of jointing faces, marking and materials together with associated pressure temperature (p/T) ratings.
The flanges are intended to be used for piping as well as for pressure vessels.

This part of EN 1514 specifies the dimensions and marking of spiral wound gaskets for use in conjunction with flat face and raised face flanges complying with the requirements of EN 1092-1 for PN 10, PN 16, PN 25, PN 40, PN 63, PN 100 and PN 160 and up to and including DN 1 000.
NOTE 1   Dimensions of other types of gaskets for use with flanges to EN 1092-1, EN 1092-2, EN 1092-3 and EN 1092 4 are given in EN 1514-1, EN 1514-3, EN 1514-4, EN 1514-6, EN 1514-7 and EN 1514-8.
NOTE 2   Annex A lists information to be supplied by the purchaser when ordering gaskets in circumstances where the choice of the gasket materials appropriate to the service is left to the manufacturer.

This European Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000. This European Standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses.

2006 12 19 Tolerance of 6 months requested before formal vote per CEN/TC 74 res. 263/2006.
Tolerance of up to nine months before enquiry (TC resolution CEN/TC 74 C 245/2004) (Note by SV on 2005-02-10)

This European Standard defines a calculation method for bolted, gasketed, circular flange joints. Its purpose is to ensure structural integrity and control of leak tightness. It uses gasket parameters based on definitions and test methods specified in EN 13555.
The calculation method is not applicable to joints with a metallic contact out of the sealing face or to joints whose rigidity varies appreciably across gasket width. For gaskets in incompressible materials, which permit large deformations, the results given by the calculation method can be excessively conservative (i.e. required bolting load too high, allowable pressure of the fluid too low, required flange thickness too large, etc.).

This standard specifies the dimensions, types, design, materials and marking requirements of non-metallic flat gaskets with or without inserts, for use with flanges complying with EN 1759-1, EN 1759-3 and EN 1759-4, for Class designations 150, 300, 600 and 900 for sizes up to and including NPS 24 (DN600).

This standard specifies the dimensions and marking of non-metallic flat gaskets,with or without inserts, for use with flanges complying with EN 1092: Parts 1,22and 3, and pipes and fittings complying with EN 545 and EN 598 up to and including PN 63 and up to and including DN 4000.

This part of EN 1092 specifies requirements for circular flanges made from ductile, grey and malleable cast iron for DN 10 to DN 4000 and PN 63. (See 4.1 and 4.2). This standard specifies the types of flanges and their facings, dimension and tolerances, bolt sizes, surface finish of jointing faces, marking testing, quality assurance and materials together with associated pressure/ temperature (p/T) ratings.