prEN ISO 15615
(Main)Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - Safety requirements in high-pressure devices (ISO/DIS 15615:2022)
Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - Safety requirements in high-pressure devices (ISO/DIS 15615:2022)
Gasschweißgeräte - Acetylenflaschen-Batterieanlagen für Schweißen, Schneiden und verwandte Prozesse - Sicherheitsanforderungen für Hochdruckeinrichtungen (ISO/DIS 15615.2:2022)
Matériel de soudage aux gaz - Centrales de détente pour la distribution d'acétylène pour le soudage, le coupage et les techniques connexes - Exigences de sécurité pour les dispositifs haute pression (ISO/DIS 15615:2022)
Oprema za plamensko varjenje - Baterije acetilenskih jeklenk za varjenje, rezanje in sorodne postopke - Varnostne zahteve za visokotlačne naprave (ISO/DIS 15615:2022)
General Information
RELATIONS
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN ISO 15615:2022
01-februar-2022
Oprema za plamensko varjenje - Baterije acetilenskih jeklenk za varjenje, rezanje
in sorodne postopke - Varnostne zahteve za visokotlačne naprave (ISO/DIS15615:2022)
Gas welding equipment - Acetylene manifold systems for welding, cutting and allied
processes - Safety requirements in high-pressure devices (ISO/DIS 15615:2022)Gasschweißgeräte - Acetylenflaschen-Batterieanlagen für Schweißen, Schneiden und
verwandte Prozesse - Sicherheitsanforderungen für Hochdruckeinrichtungen (ISO/DIS
15615.2:2022)Matériel de soudage aux gaz - Centrales de détente pour la distribution d'acétylène pour
le soudage, le coupage et les techniques connexes - Exigences de sécurité pour les
dispositifs haute pression (ISO/DIS 15615:2022)Ta slovenski standard je istoveten z: prEN ISO 15615
ICS:
25.160.30 Varilna oprema Welding equipment
oSIST prEN ISO 15615:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------oSIST prEN ISO 15615:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 15615:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 15615.2
ISO/TC 44/SC 8 Secretariat: DIN
Voting begins on: Voting terminates on:
2022-01-06 2022-03-03
Gas welding equipment — Acetylene manifold systems
for welding, cutting and allied processes — Safety
requirements in high-pressure devices
Matériel de soudage aux gaz — Centrales de détente pour la distribution d'acétylène pour le soudage, le
coupage et les techniques connexes — Exigences de sécurité pour les dispositifs haute pression
ICS: 25.160.30This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 15615.2:2022(E)
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. © ISO 2022
---------------------- Page: 3 ----------------------
oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
Contents Page
Foreword ........................................................................................................................................................................................................................................iv
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ..................................................................................................................................................................................... 1
3 Terms and definitions .................................................................................................................................................................................... 1
4 Design .............................................................................................................................................................................................................................. 2
5 Requirements .......................................................................................................................................................................................................... 2
5.1 General ........................................................................................................................................................................................................... 2
5.2 General requirements ...................................................................................................................................................................... 2
5.2.1 Materials .................................................................................................................................................................................... 2
5.2.2 External gas tightness ................................................................................................................................................... 2
5.2.3 Internal gas tightness .................................................................................................................................................... 3
5.2.4 Internal gas tightness after decomposition test .................................................................................... 3
5.2.5 Pressure resistance ......................................................................................................................................................... 3
5.2.6 Acetylene decomposition ............................................................................................................................................ 3
5.3 Additional requirements to be met by specific types of device .................................................................. 3
5.3.1 Non-return valve ................................................................................................................................................................ 3
5.3.2 Automatic quick-acting shut-off device .......................................................................................................... 3
5.3.3 Automatic pressure-actuated shut-off valve ............................................................................................. 3
5.3.4 Three-way valve ................................................................................................................................................................. 4
5.3.5 Stop valve .................................................................................................................................................................................. 4
5.3.6 Pressure gauge ..................................................................................................................................................................... 4
6 Type testing ............................................................................................................................................................................................................... 4
6.1 General ........................................................................................................................................................................................................... 4
6.2 Reference values and accuracy of instruments ......................................................................................................... 4
6.3 Test gases..................................................................................................................................................................................................... 5
6.4 External gas tightness ..................................................................................................................................................................... 5
6.5 Internal gas leakage test ................................................................................................................................................................ 5
6.6 Pressure resistance test ................................................................................................................................................................. 5
6.7 Acetylene decomposition test ................................................................................................................................................... 5
6.7.1 General ........................................................................................................................................................................................ 5
6.7.2 Test conditions ..................................................................................................................................................................... 5
6.7.3 Test procedure and test precautions ................................................................................................................ 6
6.7.4 Additional test conditions for certain devices ......................................................................................... 6
6.8 Non-return valve tests ..................................................................................................................................................................... 7
6.8.1 General ........................................................................................................................................................................................ 7
6.8.2 Reverse flow test for non-return valves ........................................................................................................ 7
6.8.3 Fatigue test for non-return valves ...................................................................................................................... 8
6.9 Endurance test for three-way valves and stop valves ......................................................................................... 9
6.10 Trip pressure test for automatic pressure-actuated shut-off valves ...................................................... 9
6.10.1 Equipment ................................................................................................................................................................................ 9
6.10.2 Test procedure................................................................................................................................................................... 10
7 Manufacturer's instructions ................................................................................................................................................................10
8 Marking ........................................................................................................................................... ............................................................................11
Annex A (normative) Summary of tests ........................................................................................................................................................12
Bibliography .............................................................................................................................................................................................................................16
iii© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes,
Subcommittee SC 8, Equipment for gas welding, cutting and allied processes.Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.This third edition cancels and replaces the second edition (ISO 15615:2002), which has been technically
revised.The main changes compared to the previous edition are as follows:
— the manual quick-acting shut-off valve has been removed from the document because it is no longer
state of the art;— the remotely actuated shut-off valve has been removed from the document because it is no longer
state of the art;— in 3.8 the definition of change-over unit has been added;
— in 5.3.4 the test method for three-way valves have been precised;
— in 5.3.6 specific requirements for pressure gauges have been added;
— new subclause 6.4 has been added;
— in 6.7.2 tolerances have been added;
— in 6.7.3, a minimum value for vacuum has been added;
— in 6.8.2 other comparable test methods for leakage have been permitted;
— in 6.8.3 a minimum settling time of pressure has been added;
— in 8 the kind of device has been added to the marking.
© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
Official interpretations of ISO/TC 44 documents, where they exist, are available from this page:
https://committee.iso.org/sites/tc44/home/interpretation.html.© ISO 2022 – All rights reserved
---------------------- Page: 7 ----------------------
oSIST prEN ISO 15615:2022
---------------------- Page: 8 ----------------------
oSIST prEN ISO 15615:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 15615.2:2022(E)
Gas welding equipment — Acetylene manifold systems
for welding, cutting and allied processes — Safety
requirements in high-pressure devices
1 Scope
This document establishes the general specifications, requirements and tests for devices located on the
high-pressure side of acetylene manifold systems up to 25 bar (2,5 MPa) as defined in ISO 14114. It does
not cover the high-pressure piping, high-pressure flexible hoses or the pressure regulator.
2 Normative referencesThe 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.
ISO 5171, Gas welding equipment — Pressure gauges used in welding, cutting and allied processes
ISO 9090, Gas tightness of equipment for gas welding and allied processesISO 9539, Gas welding equipment — Materials for equipment used in gas welding, cutting and allied
processesISO 10297, Gas cylinders — Cylinder valves — Specification and type testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15296:2017 and the following
apply.ISO and IEC maintain terminological 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
non-return valve
device that prevents passage of gas in the direction opposite to the intended flow
[SOURCE: ISO 15296:2017, 3.4.2]3.2
automatic quick-acting shut-off device
self-acting device that closes quickly, e.g. when triggered by an acetylene decomposition in the high-
pressure manifold pipework[SOURCE: ISO 15296:2017, 3.4.10, modified - “acetylene explosion” was replaced by “acetylene
decomposition”]3.3
automatic pressure-actuated shut-off valve
device which automatically stops the gas supply to the regulator when the downstream pressure rises
above the maximum operating pressure© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
3.4
three-way valve
device which can be manually or automatically actuated and allows gas flow from one side of the high-
pressure manifold to enter the regulator while isolating flow from the other side
Note 1 to entry: Its position can be reversed so that gas flows from the other side while the first side is isolated. It
prevents simultaneous flow from both sides.3.5
stop valve
device to prevent the flow of gas when closed
3.6
multifunctional safety device
device that incorporates two or more of the safety functions
[SOURCE: ISO 15296:2017, 3.4.8]
3.7
pressure gauge
device which shows the actual pressure of the assembly (digital or analogue readouts) (e.g. used in the
high-pressure line of manifold systems)3.8
change-over unit
device in a two-sided system allowing switching the supply of gas to the system from either of its bank
of cylinders or bundles by means of a pressure actuated switching mechanism without interrupting
supply[SOURCE: ISO 14114:2017, 3.7, modified − “by means of a pressure actuated switching mechanism” has
been added to the definition. The note to entry has been deleted.]4 Design
Components within the devices should be designed to remain at the same electrostatic potential as the
body of the device during operation. All metal components in contact with gas should be electrically
continuous to prevent static electricity discharges.5 Requirements
5.1 General
The general requirements (see 5.2) apply to all the devices defined in Clause 3. The multifunctional
safety devices shall meet the general and additional requirements corresponding to each function.
All flow and leakage rates figures in this document shall be specified and measured under normal
conditions (1 016 hPa, 20 °C).5.2 General requirements
5.2.1 Materials
Materials used for devices shall be in accordance with ISO 9539.
5.2.2 External gas tightness
The general requirements on external gas tightness shall be in accordance with ISO 9090 at all times,
before and after the tests. See 6.4 for test details.© ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
5.2.3 Internal gas tightness
Where internal gas tightness is required in this document, the leakage rate shall not exceed 50 cm /h
for devices with a connection internal bore (diameter) less than 11 mm, or less than 0,41d for larger
diameters. See 6.5 for test details.2 3
NOTE The expression 0,41d gives the value of the flow in cm /h, where d is the internal bore (diameter),
in mm, of the largest connection in the device.5.2.4 Internal gas tightness after decomposition test
Where internal gas tightness is required after acetylene decomposition, the leakage rate shall not
exceed 50 l/h (see 6.5 for test details).5.2.5 Pressure resistance
The housings of the devices shall withstand a pressure of 31,5 MPa (315 bar) for 5 min without any
observed leakage. After pressurization, there shall be no visible permanent deformation (see 6.6 for
test details).5.2.6 Acetylene decomposition
After the device has been tested with decomposition at 2,5 MPa (25 bar) initial pressure in accordance
with 6.7, there shall be no visible permanent deformation of the device. No escape of gas shall occur
during the test. No part shall be ejected. Destruction of inner parts is permitted.
5.3 Additional requirements to be met by specific types of device5.3.1 Non-return valve
Non-return valves shall not allow the reverse flow of gas greater than 150 cm /h (0,15 l/h) when tested
with a back pressure of 0,05 MPa (0,5 bar) and 2,5 MPa (25 bar) in accordance...
SLOVENSKI STANDARD
oSIST prEN ISO 15615:2020
01-maj-2020
Oprema za plamensko varjenje - Baterije acetilenskih jeklenk za varjenje, rezanje
in sorodne postopke - Varnostne zahteve za visokotlačne naprave (ISO/DIS15615:2020)
Gas welding equipment - Acetylene manifold systems for welding, cutting and allied
processes - Safety requirements in high-pressure devices (ISO/DIS 15615:2020)Gasschweißgeräte - Acetylenflaschen-Batterieanlagen für Schweißen, Schneiden und
verwandte Prozesse - Sicherheitsanforderungen für Hochdruckeinrichtungen (ISO/DIS
15615:2020)Matériel de soudage aux gaz - Centrales de détente pour la distribution d'acétylène pour
le soudage, le coupage et les techniques connexes - Exigences de sécurité pour les
dispositifs haute pression (ISO/DIS 15615:2020)Ta slovenski standard je istoveten z: prEN ISO 15615
ICS:
25.160.30 Varilna oprema Welding equipment
oSIST prEN ISO 15615:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------oSIST prEN ISO 15615:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 15615:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 15615
ISO/TC 44/SC 8 Secretariat: DIN
Voting begins on: Voting terminates on:
2020-03-10 2020-06-02
Gas welding equipment — Acetylene manifold systems
for welding, cutting and allied processes — Safety
requirements in high-pressure devices
Matériel de soudage aux gaz — Centrales de détente pour la distribution d'acétylène pour le soudage, le
coupage et les techniques connexes — Exigences de sécurité pour les dispositifs haute pression
ICS: 25.160.30THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 15615:2020(E)
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. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 15615:2020
ISO/DIS 15615:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 15615:2020
ISO/DIS 15615:2020(E)
Contents Page
Foreword ........................................................................................................................................................................................................................................iv
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Terms and definitions ..................................................................................................................................................................................... 1
4 Design .............................................................................................................................................................................................................................. 2
5 Requirements .......................................................................................................................................................................................................... 2
5.1 General ........................................................................................................................................................................................................... 2
5.2 General requirements ....................................................................................................................................................................... 2
5.2.1 Materials ................................................................................................................................................................................. 2
5.2.2 External gas tightness ................................................................................................................................................. 2
5.2.3 Internal gas tightness................................................................................................................................................... 2
5.2.4 Internal gas tightness after decomposition test ................................................................................... 3
5.2.5 Pressure resistance ........................................................................................................................................................ 3
5.2.6 Acetylene decomposition ......................................................................................................................................... 3
5.3 Additional requirements to be met by specific types of device .................................................................... 3
5.3.1 Non-return valve .............................................................................................................................................................. 3
5.3.2 Automatic quick-acting shut-off device .................. ...................................................................................... 3
5.3.3 Remotely actuated shut-off valve ...................................................................................................................... 3
5.3.4 Automatic pressure-actuated shut-off valve ............................................................................................ 3
5.3.5 Three-way valve................................................................................................................................................................ 4
5.3.6 Stop valve ............................................................................................................................................................................... 4
6 Type tests ..................................................................................................................................................................................................................... 4
6.1 General ........................................................................................................................................................................................................... 4
6.2 Reference values and accuracy of instruments ........................................................................................................... 4
6.3 Test gases ..................................................................................................................................................................................................... 4
6.4 Acetylene decomposition test .................................................................................................................................................... 4
6.4.1 General...................................................................................................................................................................................... 4
6.4.2 Test conditions................................................................................................................................................................... 5
6.4.3 Test procedure and test precautions .............................................................................................................. 6
6.5 Pressure resistance test .................................................................................................................................................................. 6
6.6 Non-return valve test ......................................................................................................................................................................... 6
6.6.1 General...................................................................................................................................................................................... 6
6.6.2 Reverse flow test .............................................................................................................................................................. 7
6.6.3 Fatigue test ............................................................................................................................................................................ 7
6.7 Endurance test ........................................................................................................................................................................................ 8
6.8 Trip pressure test for automatic pressure-actuated shut-off valves ........................................................ 8
6.8.1 Equipment ............................................................................................................................................................................. 8
6.8.2 Test procedure ................................................................................................................................................................... 9
6.9 Internal gas leakage test ................................................................................................................................................................. 9
6.10 External gas tightness ....................................................................................................................................................................... 9
7 Manufacturer's instructions ..................................................................................................................................................................... 9
8 Marking .......................................................................................................................................................................................................................10
Annex A (normative) Summary of tests ..........................................................................................................................................................11
Bibliography .............................................................................................................................................................................................................................18
© ISO 2020 – All rights reserved iii---------------------- Page: 5 ----------------------
oSIST prEN ISO 15615:2020
ISO/DIS 15615:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15615 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 8, Equipment for gas welding, cutting and allied processes.This second edition cancels and replaces the first edition (ISO 15615:2002), which has been technically
revised.The main changes compared to the previous edition are as follows:
— The manual quick-acting shut-off valve was deleted throughout the document because it is no longer
state of the art;— In Clause 6.3.4 a minimum value for vacuum was added;
— In Clause 6.6.3 a minimum settling time of pressure was added;
— Clause 6.10 was added;
Requests for official interpretations of any aspect of this International Standard should be directed to
the Secretariat of ISO/TC 44/SC 8 via your national standards body. A complete listing of these bodies
can be found at www .iso .org.iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 15615:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 15615:2020(E)
Gas welding equipment — Acetylene manifold systems
for welding, cutting and allied processes — Safety
requirements in high-pressure devices
1 Scope
This International Standard establishes the general specifications, requirements and tests for devices
located on the high-pressure side of acetylene manifold systems as defined in ISO 14114. It does not
cover the high-pressure piping, flexible hoses and the regulator.NOTE The terms “upstream” and “downstream” refer to the normal direction of gas flow in the device.
2 Normative referencesThe following referenced documents are indispensable for the application 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.ISO 9090, Gas tightness of equipment for gas welding and allied processes
ISO 9539, Gas welding equipment — Materials for equipment used in gas welding, cutting and allied
processesISO 10297, Gas cylinders — Cylinder valves — Specification and type testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
non-return valve
device which prevents passage of gas in the direction opposite to flow
[SOURCE: ISO 15296:2004]
3.2
automatic quick-acting shut-off device
self-acting device which closes quickly, e.g. when triggered by an acetylene explosion in the high-
pressure manifold pipework[SOURCE: ISO 15296:2004]
3.3
remotely actuated shut-off valve
quick-acting shut-off valve which quickly stops the gas flow when remotely triggered
3.4automatic pressure-actuated shut-off valve
device which automatically stops the gas supply to the regulator when the downstream pressure rises
above the maximum operating pressure© ISO 2020 – All rights reserved 1
---------------------- Page: 7 ----------------------
oSIST prEN ISO 15615:2020
ISO/DIS 15615:2020(E)
3.5
three-way valve
device which allows gas flow from one side of the high-pressure manifold to enter the regulator while
isolating flow from the second sideNote 1 to entry: Its position can be reversed so that gas flows from the second side while the first side is isolated.
It prevents simultaneous flow from both sides.3.6
stop valve
device to prevent, when closed, the flow of gas
3.7
multifunctional safety device
device which incorporates two or more of the safety functions
[SOURCE: ISO 15296:2004]
3.8
pressure gauge
device which shows the actual pressure of the assembly (digital or analogue readouts) (e.g. used in the
high-pressure line of manifold systems or in pressure regulators for manifold systems.)
4 DesignComponents within the devices should be designed to remain at the same electrostatic potential as the
body of the device during operation. All metal components in contact with gas should be electrically
continuous to prevent static electricity discharges.5 Requirements
5.1 General
The general requirements (see 5.2) apply to all the devices defined in Clause 3. The multifunctional
safety devices shall meet the general and additional requirements corresponding to each function.
5.2 General requirements5.2.1 Materials
Materials used for devices shall be in accordance with ISO 9539.
5.2.2 External gas tightness
The general requirements on external gas tightness shall be in accordance with ISO 9090 at all times,
before and after the tests.5.2.3 Internal gas tightness
Where internal gas tightness is required in this International Standard, the leakage rate shall not
exceed 50 cm /h for devices with a connection internal bore (diameter) less than 11 mm, or less than
0,41d for larger diameters. See 6.9 for test details.2 3
NOTE The expression 0,41d gives the value of the flow in cm /h when d is the internal bore (diameter),
in mm, of the largest connection in the device.2 © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 15615:2020
ISO/DIS 15615:2020(E)
5.2.4 Internal gas tightness after decomposition test
Where internal gas tightness is required after acetylene decomposition, the leakage rate shall not
exceed 50 l/h. See 6.9 for test details.5.2.5 Pressure resistance
The housings of the devices shall withstand a pressure of 31,5 MPa (315 bar) for 5 min without any
observed leakage. After pressurization, there shall be no visible permanent deformation. See 6.5 for
test details.5.2.6 Acetylene decomposition
After the device has been tested with decomposition at 2,5 MPa initial pressure in accordance with 6.4,
there shall be no visible permanent deformation of the device. No escape of gas shall occur during the
test. Destruction of inner parts is permitted.5.3 Additional requirements to be met by specific types of device
5.3.1 Non-return valve
Non-return valves shall not allow the reverse flow of gas greater than 150 cm /h (0,15 l/h) when tested
in accordance with 6.6.1 and 6.6.2, both before and after the 2 000-cycle fatigue test (see 6.6.3).
This requirement does not apply to the non-return valve after it has been subjected to the acetylene
decomposition test.5.3.2 Automatic quick-acting shut-off device
Automatic quick-acting shut-off devices shall be triggered by an acetylene decomposition at 0,6 MPa
(6 bar) and 2,5 MPa (25 bar). After tripping by acetylene decomposition, the internal gas leakage shall
meet the requirements of 5.2.4.5.3.3 Remotely actuated shut-off valve
Remotely actuated shut-off valves shall be triggered by an acetylene decomposition at 0,6 MPa (6 bar)
and 2,5 MPa (25 bar). Remotely actuated shut-off valves shall meet the requirements of 5.2.3 before the
decomposition test (see 6.4) and after the endurance test. See 6.7 for endurance test details.
5.3.4 Automatic pressure-actuated shut-off valveAutomatic pressure-actuated shut-off valves shall be triggered (stop gas flow on high-pressure side)
at a pressure on the low-pressure signal port between 0,16 MPa and 0,20 MPa (1,6 bar and 2,0 bar) at
both 0,1 MPa and 2,5 MPa (1 bar and 25 bar) on the high-pressure side. When triggered, the internal gas
leakage shall meet the requirements of 5.2.3. See 6.8.2.1 (test 1) and 6.8.2.2 (test 2) for details.
The valve shall not be triggered when a pressure of 0,145 MPa to 0,150 MPa (1,45 bar to 1,50 bar) is held
on the low-pressure signal port for 168 h. See 6.8.2.3 (test 3) for details.Once actuated (closed), it shall not be possible for the valve to reset to an open condition without
manual intervention.In addition to the 31,5 MPa (315 bar) pressu
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