prEN 17931

SLOVENSKI STANDARD
01-marec-2023
Oprema za plamensko varjenje - Ročna oprema za varjenje, segrevanje in rezanje -
Periodična kontrola
Gas welding equipment - Manual gas equipment for welding, heating and cutting -
Periodic Inspection
Ausrüstung zum Gasschweißen - Handbetätigte Ausrüstung zum Schweißen, Erhitzen
und Schneiden - Regelmäßige Prüfung
Ta slovenski standard je istoveten z: prEN 17931
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2023
ICS 25.160.30
English Version
Gas welding equipment - Manual gas equipment for
welding, heating and cutting - Periodic Inspection
Ausrüstung zum Gasschweißen - Handbetätigte
Ausrüstung zum Schweißen, Erhitzen und Schneiden -
Regelmäßige Prüfung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 121.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17931:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Single manual installation . 6
4.1 General . 6
4.2 Equipment . 8
4.3 Periodic inspection . 8
4.3.1 General . 8
4.3.2 Visual testing . 8
4.3.3 Leakage testing . 8
4.4 Frequency of periodic inspection . 9
5 Test report . 14
Bibliography . 15

European foreword
This document (prEN 17931:2023) has been prepared by Technical Committee CEN/TC 121 “Welding
and allied processes”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
Introduction
Manual gas equipment for welding, cutting and allied processes is formed by various components that
enable the required features, including, for example, but not limited to: gas tightness, resistance to heat
and mechanical stress, adjustment of the gas flow and of the mixtures, etc.
The manufacturer provides guidelines on the type of maintenance and periodic checks to perform on the
equipment. However, the rate of use and the conditions to which this equipment is subjected are
extremely variable.
This document is meant to help the employer and the workers define the maintenance activities that are
suitable for a safe use of the equipment, in accordance with current legislation.
1 Scope
This document provides guidelines for periodic inspections of manual gas equipment for welding, cutting
and allied processes placed downstream of the gas cylinder’s valve as shown in Figure 1 or, in the case of
centralized distribution, downstream from the tapping point, since commissioning.
NOTE In some cases, gas cylinders can be replaced by cylinder bundles.
This document applies to gas welding equipment intended for professional use which utilizes
compressed gases up to 300 bar (30 MPa): acetylene, liquefied petroleum gas (LPG), methylacetylene-
propadiene mixtures (MPS) and carbon dioxide (CO ) and related mixtures.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 560, Gas welding equipment - Hose connections for equipment for welding, cutting and allied processes
EN 561, Gas welding equipment - Quick-action coupling with shut-off valves for welding, cutting and allied
processes
EN 1256, Gas welding equipment - Specification for hose assemblies for equipment for welding, cutting and
allied processes
EN 13018, Non-destructive testing - Visual testing - General principles
EN ISO 2503, Gas welding equipment - Pressure regulators and pressure regulators with flow-metering
devices for gas cylinders used in welding, cutting and allied processes up to 300 bar (30 MPa) (ISO 2503)
EN ISO 3821, Gas welding equipment - Rubber hoses for welding, cutting and allied processes (ISO 3821)
EN ISO 5172, Gas welding equipment - Blowpipes for gas welding, heating and cutting - Specifications and
tests (ISO 5172)
EN ISO 5175-1, Gas welding equipment - Safety devices - Part 1: Devices incorporating a flame (flashback)
arrestor (ISO 5175-1)
EN ISO 7291, Gas welding equipment - Pressure regulators for manifold systems used in welding, cutting
and allied processes up to 30 MPa (300 bar) (ISO 7291)
EN ISO 9090, Gas tightness of equipment for gas welding and allied processes (ISO 9090)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 560, EN 561, EN 1256,
EN 13018, EN ISO 2503, EN ISO 3821, EN ISO 5172, EN ISO 5175-1, EN ISO 7291 and EN ISO 9090 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
gas equipment
equipment, accessory, or device that contributes to creating an installation that uses gas (for example, for
the purpose of combustion or gas protection) in welding, cutting or allied processes
3.2
commissioning
all the operations needed to get gas equipment up and running (for example, replacing the cylinder or
the connection between components)
3.3
single manual installation
work area which has all the manual gas equipment intended for a single installation to perform welding,
cutting or allied processes by using gas (for example, for the purpose of combustion or gas protection)
3.4
complete inspection
all the operations needed to make the equipment suitable for further use until its next complete
inspection or its replacement
Note 1 to entry: Such operations, if allowed by the manufacturer, generally include:
— complete or partial dismantling of the equipment;
— replacement of the components that are subject to wear and tear and deterioration through use with
original spare parts;
— reassembling and commissioning.
4 Single manual installation
4.1 General
A single manual gas installation generally consists of:
— for oxy-fuel gas processes generally two cylinders, one containing oxygen and one containing a
combustible gas (such as acetylene) fitted with shut-off valves;
NOTE 1 Also, a bundle(s), instead of cylinder(s) can be considered part of manual gas installation.
— for shielding gas processes or other allied processes generally one cylinder containing appropriate
gas or mixture;
NOTE 2 Also, a bundle(s), instead of cylinder(s), can be considered part of manual gas installation.
— a pressure regulator for each cylinder;
— quick-action couplings with shut-off valves;
— rubber hoses;
— connectors to join different components;
— safety devices, e.g. with flame arrestors and gas non-return valves;
— process devices, e.g. blowpipe.
Examples of single manual gas installations, such as oxy-fuel or gas protection, are shown in Figure 1.
NOTE 3 As an example, Figure 1 shows a mobile installation with cylinders on a trolley, but the guidelines apply
to all configurations:
— downstream of bundles fitted with regulators integrated or not integrated;
— downstream of cylinders fitted with integrated regulators;
— downstream of tapping point in the case of a fixed installation.

a) Example of installation with oxy-fuel b) Example of installation with a shielding gas
cylinders cylinder
NOTE The equipment inside the dotted line is not
covered by this document.
Key
1 pressure regulators for cylinders (or cylinder bundles)
2 quick-action couplings with shut-off valves (optional)
3 rubber hoses and connectors
4 safety devices with flame arrestors and gas non-return valves
5 oxy-fuel blowpipe
Figure 1 — Examples of single manual gas installations
4.2 Equipment
The equipment adopted in a gas installation shall comply with the technical standards listed below:
— cylinder/s or bundle/s with their valves. As an alternative, there can be two cylinder/s or bundle/s
fitted with valves with integrated regulators, or tapping point in the case of a fixed installation
powered by a distribution network.
NOTE All the devices listed above are not subject to this document and can comply with the applicable technical
standards.
— a pressure regulator for each cylinder, in accordance with EN ISO 2503 or in the case of a manifold
system/bundle with EN ISO 7291;
— quick-action couplings with shut-off valves, in accordance with EN 561;
— rubber hoses, in accordance with EN ISO 3821;
— connectors for rubber hoses, in accordance with EN 560;
— pre-assembled connectors between hoses and other equipment, in accordance with EN 1256;
— safety devices with flame arrestors and gas non-return valves, in accordance with EN ISO 5175-1;
— blowpipes, in accordance with EN ISO 5172.
4.3 Periodic inspection
4.3.1 General
A periodic inspection shall be done and shall consist of either a visual testing or leakage testing or both,
or complete inspection or replacement.
The working areas for these activities shall be specific and fitted with equipment and systems that
guarantee cleanliness and safety considerations specific to the gas being used.
NOTE Further specific considerations can be taken for equipment using oxygen.
A list of the tools and accessories required for carrying out all operations under periodic inspection shall
be made available.
4.3.2 Visual testing
Direct, unaided visual testing (naked eye vision) shall be done in accordance with EN 13018.
NOTE 1 Visual testing (VT) is a non-destructive testing method.
NOTE 2 Visual testing can be carried out by competent user.
4.3.3 Leakage testing
Leakage tests shall comply with EN ISO 9090.
NOTE 1 Leakage tests set the maximum limit for acceptable leaks in every type of equipment. The testing
methods used to verify that tightness is within the limits set by EN ISO 9090 can vary. Other test methods for leakage
are permitted, provided that it can be shown that these give results as accurate as those available from the method
given in EN ISO 9090.
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