EN 17942:2024

Welding and allied processes - Gas welding equipment - Safety requirements for thermoprocess equipment with open firing oxy-fuel gas welding equipment

This document, together with EN 746-1, EN 746-2 and EN 746-11, specifies the safety requirements for industrial thermoprocessing equipment ( IThE) with "Open firing oxy-fuel gas welding equipment", as well as the relevant gas distribution and protective systems. This document applies to IThE supplied with fuel gases. IThE in the scope of application of this document shall be able to be operated under the following ambient conditions:
- temperature range;
- during operation: +5°C to +40°C;
- during transportation and storage: -5°C to +55°C;
- relative humidity: up to 90% at 20°C, non-condensing.
This document covers the significant hazards, hazardous situations and events listed in Appendix A for oxy-fuel IThE, associated gas supply systems and protective systems on the basis that they are used as intended and under the conditions specified by the manufacturer.
This document applies to:
- gas distribution system, beginning in the direction of flow with the manually isolation main shut-off valve at the inlet of the thermoprocessing equipment;
- burner, burner assembly and ignition devices, open firing;
- Safety control system (protective system).
This document is applicable to all types of combustion of fuel gases with atmospheric air, compressed air or oxygen. This document also includes necessary requirements for user information. This document does not apply to manual burners, systems for flame spraying and micro soldering torches.
This document does not apply to systems for welding, cutting and associated processes using plasma and laser technology. This document does not cover the hazards arising as a result of the release of flammable substances from the products processed in the IThE.
This document is not applicable to electrical wiring and heavy-current wiring connected upstream of the IThE control cabinet/control panel/protective system.
Noise and optical radiation can cause significant hazards when using gas welding equipment. These are not covered in this document.
This document is not applicable to oxy-fuel IThE, associated gas supply systems and protective systems manufactured before the date of publication of this document in the Official Journal of the EU.

Schweißen und verwandte Verfahren - Gasschweißgeräte - Sicherheitsanforderungen an industrielle Thermoprozess-Einrichtungen mit freibrennenden Gasschweißgeräten der Autogentechnik

Dieses Dokument legt zusammen mit EN 746 1:1997+A1:2009, EN 746 2:2010 und ISO 13577 4:2022 die Sicherheitsanforderungen an industrielle Thermoprozess-Einrichtungen mit „freibrennenden Gasschweißgeräten der Autogentechnik“, deren Gasverteilungssysteme und Schutzsysteme fest. (Im Folgenden werden Industrielle Thermoprozess-Einrichtungen als „IThE“ bezeichnet).
Dieses Dokument ist anwendbar auf IThE, die mit Brenngasen versorgt werden. Anhang B enthält Beispiele typischer IThE.
Dieses Dokument behandelt die in Anhang A aufgeführten signifikanten Gefährdungen, Gefährdungssituationen und -ereignisse für IThE der Autogentechnik, deren Gasführungssysteme und Schutzsysteme, auf der Grundlage, dass diese, wie vorgesehen, und unter den vom Hersteller vorgesehenen Bedingungen eingesetzt werden.
Dieses Dokument ist anwendbar auf:
-   Gasverteilungssystem, in Strömungsrichtung beginnend mit dem handbetätigten Hauptabsperrventil am Eingang der Thermoprozess-Einrichtung;
-   Brenner, Brennergruppe und Zündeinrichtungen, freibrennend;
-   sicherheitsbezogenes Steuerungssystem (Schutzsystem).
Dieses Dokument ist anwendbar auf alle Arten von Verbrennung von Brenngasen mit atmosphärischer Luft, mit komprimierter Luft oder Sauerstoff.
Dieses Dokument behandelt auch notwendige Anforderungen für die Benutzerinformation.
Dieses Dokument ist nicht anwendbar auf Handbrenner, Anlagen zum Flammspritzen und Mikrolötbrenner.
Dieses Dokument ist nicht anwendbar auf Anlagen zum Schweißen, Schneiden und verwandten Prozessen mittels Plasma- und Lasertechnologie. Dieses Dokument behandelt nicht die Gefährdungen, die durch Freisetzung von entzündbaren Substanzen aus den in der IThE verarbeiteten Produkten entstehen.
Dieses Dokument ist nicht anwendbar auf beladene mobile Trolleys, welche Sauerstoff- und Brenngasflaschen mit Druckreglern und Schweiß- und Schneidbrennern mitführen.
Dieses Dokument ist nicht anwendbar auf elektrische Verkabelung und Starkstromverkabelung, die dem IThE-Steuerungsschrank/Bedienerfeld/Schutzsystem vorgeschaltet ist.
Lärm und optische Strahlung können signifikante Gefährdungen beim Einsatz von Gasschweißgeräten sein. Sie werden in diesem Dokument nicht behandelt.
Dieses Dokument ist anwendbar auf eine IThE der Autogentechnik, deren Gasführungssysteme und Schutzsysteme, die nach dem Datum der Veröffentlichung dieses Dokuments im Amtsblatt der EU hergestellt wurden.

Soudage et techniques connexes - Matériel de soudage aux gaz - Prescriptions de sécurité pour les équipements thermiques avec matériel de soudage oxygaz à flamme nue

Varjenje in sorodni postopki - Oprema za plamensko varjenje - Varnostne zahteve za opremo za toplotne procese z odprtim plamenom

General Information

• Status: Published
• Publication Date: 10-Sep-2024
• ICS: 25.160.30 - Welding equipment
• Technical Committee: CEN/TC 121 - Welding
• Drafting Committee: CEN/TC 121/WG 19 - Equipment for gas welding, cutting and allied processes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Sep-2024
• Due Date: 05-Apr-2023
• Completion Date: 11-Sep-2024
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: SIST EN 17942:2024 - Welding and allied processes - Gas welding equipment - Safety requirements for thermoprocess equipment with open firing oxy-fuel gas welding equipment

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2024
Varjenje in sorodni postopki - Oprema za plamensko varjenje - Varnostne zahteve
za opremo za toplotne procese z odprtim plamenom
Welding and allied processes - Gas welding equipment - Safety requirements for
thermoprocess equipment with open firing oxy-fuel gas welding equipment
Schweißen und verwandte Prozesse - Gasschweißgeräte - Sicherheitsanforderungen an
industrielle Thermoprozessanlagen mit freibrennenden Gasschweißgeräten der
Autogentechnik
Soudage et techniques connexes - Matériel de soudage aux gaz - Prescriptions de
sécurité pour les équipements thermiques avec matériel de soudage oxygaz à flamme
nue
Ta slovenski standard je istoveten z: EN 17942:2024
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17942
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2024
EUROPÄISCHE NORM
ICS 25.160.30
English Version
Welding and allied processes - Gas welding equipment -
Safety requirements for thermoprocess equipment with
open firing oxy-fuel gas welding equipment
Soudage et techniques connexes - Matériel de soudage Schweißen und verwandte Prozesse -
aux gaz - Prescriptions de sécurité pour les Gasschweißgeräte - Sicherheitsanforderungen an
équipements thermiques avec matériel de soudage industrielle Thermoprozessanlagen mit
oxygaz à flamme nue freibrennenden Gasschweißgeräten der
Autogentechnik
This European Standard was approved by CEN on 21 July 2024.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17942:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 10
4 Safety requirements, measures and ascertaining compliance . 11
4.1 General. 11
4.2 Gases . 12
4.2.1 General. 12
4.2.2 Gases in accordance with EN 437:2021 . 12
4.2.3 Acetylene . 12
4.2.4 Hydrogen. 13
4.2.5 Oxygen or oxygen-enriched combustion air . 13
4.3 Gas distribution system . 15
4.3.1 General. 15
4.3.2 Connections . 16
4.3.3 Interrupted lines . 16
4.3.4 Galvanic elements . 16
4.3.5 Gas warning devices – Stationary gas detector . 16
4.3.6 Hoses and couplings. 16
4.3.7 Labelling . 17
4.3.8 Inspection and testing . 17
4.3.9 Condensate drains . 18
4.3.10 Purge points . 18
4.3.11 Safety devices to prevent gas back flow and flashback . 18
4.3.12 Pressure fluctuations . 19
4.3.13 Bypass . 19
4.3.14 Disconnection of prescribed safety devices . 19
4.3.15 Mandatory safety devices . 19
4.3.16 Industrial thermo-processing equipment . 20
4.3.17 Valve monitoring system . 20
4.3.18 Gas pressure regulator . 21
4.3.19 Pressure and flow monitors . 21
4.3.20 Filters/strainers . 21
4.3.21 Exhaust gas system . 21
4.3.22 Ignition system . 22
4.3.23 Individual manual shut-off valves for gas welding equipment . 22
4.3.24 Supply of pre-mixed fuel gas/air mixtures to the gas welding equipment . 22
4.3.25 Gas welding equipment . 22
4.3.26 Startup and ignition . 23
4.3.27 Safety time . 24
4.3.28 Flame failure . 25
4.3.29 Burner power control unit . 25
4.3.30 Flame monitoring . 26
5 Requirements to the design of electrical and electronic equipment for control and
protective systems . 26
6 Checking of safety requirements and/or measures . 27
7 User information . 30
7.1 Labelling . 30
7.2 Operating instructions . 30
7.3 Description of the IThE . 31
7.4 Checking procedure . 31
7.5 Commissioning . 31
7.6 Shutdown procedure . 32
7.7 Maintenance procedure . 32
7.8 Documentation . 32
Annex A (informative) List of hazards . 33
Annex B (informative) Typical examples of industrial thermoprocessing equipment, gas welding
equipment . 35
Annex C (informative) Typical examples of piping diagrams . 36
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2006/42/EC aimed to be covered . 41
Bibliography . 43

European foreword
This document (EN 17942:2024) has been prepared by Technical Committee CEN/TC 121 “Welding and
allied processes”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2025, and conflicting national standards shall be
withdrawn at the latest by March 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For relationship with EU Legislation, see informative Annex ZA, which is an integral part of this document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
...