SIST EN ISO 15615:2023
(Main)Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - Safety requirements in high-pressure devices (ISO 15615:2022)
Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - Safety requirements in high-pressure devices (ISO 15615:2022)
This document establishes the general specifications, requirements and tests for devices located on the high-pressure side of acetylene manifold systems up to 2,5 MPa (25 bar) as defined in ISO 14114. It does not apply to high-pressure piping, high-pressure flexible hoses or pressure regulators.
Gasschweißgeräte - Acetylenflaschen-Batterieanlagen für Schweißen, Schneiden und verwandte Prozesse - Sicherheitsanforderungen für Hochdruckeinrichtungen (ISO 15615.2:2022)
Dieses Dokument legt allgemeine Festlegungen, Anforderungen und Prüfungen für hochdruckseitig liegende Ausrüstungsteile in Acetylenflaschen Batterieanlagen bis 2,5 MPa (25 bar) nach ISO 14114 fest. Diese Norm gilt nicht für Hochdruckleitungen, Hochdruckschlauchleitungen oder Druckregler.
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 15615:2022)
Le présent document établit les spécifications générales, les exigences et les essais pour les dispositifs utilisés sur le côté haute pression des centrales de détente pour la distribution d’acétylène jusqu’à 2,5 MPa (25 bar) telles que définies dans l’ISO 14114. Il ne traite pas des canalisations haute pression, des tuyaux souples haute pression ou des détendeurs.
Oprema za plamensko varjenje - Baterije acetilenskih jeklenk za varjenje, rezanje in sorodne postopke - Varnostne zahteve za visokotlačne naprave (ISO 15615.2:2022)
Ta dokument podaja splošne specifikacije, zahteve in preskuse za naprave, ki se nahajajo na tisti strani baterij acetilenskih jeklenk, kjer je visok tlak do 2,5 MPa (25 barov), kot je opredeljeno v standardu ISO 14114. Ne uporablja se za visokotlačno ocevje, visokotlačne hidroizolacijske cevi ali tlačne regulatorje.
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SLOVENSKI STANDARD
SIST EN ISO 15615:2023
01-marec-2023
Nadomešča:
SIST EN ISO 15615:2013
Oprema za plamensko varjenje - Baterije acetilenskih jeklenk za varjenje, rezanje
in sorodne postopke - Varnostne zahteve za visokotlačne naprave (ISO
15615.2:2022)
Gas welding equipment - Acetylene manifold systems for welding, cutting and allied
processes - Safety requirements in high-pressure devices (ISO 15615:2022)
Gasschweißgeräte - Acetylenflaschen-Batterieanlagen für Schweißen, Schneiden und
verwandte Prozesse - Sicherheitsanforderungen für Hochdruckeinrichtungen (ISO
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 15615:2022)
Ta slovenski standard je istoveten z: EN ISO 15615:2022
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN ISO 15615:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 15615:2023
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SIST EN ISO 15615:2023
EN ISO 15615
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 25.160.30 Supersedes EN ISO 15615:2013
English Version
Gas welding equipment - Acetylene manifold systems for
welding, cutting and allied processes - Safety requirements
in high-pressure devices (ISO 15615:2022)
Matériel de soudage aux gaz - Centrales de détente Gasschweißgeräte - Acetylenflaschen-Batterieanlagen
pour la distribution d'acétylène pour le soudage, le für Schweißen, Schneiden und verwandte Prozesse -
coupage et les techniques connexes - Exigences de Sicherheitsanforderungen für Hochdruckeinrichtungen
sécurité pour les dispositifs haute pression (ISO (ISO 15615.2:2022)
15615:2022)
This European Standard was approved by CEN on 20 October 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15615:2022 E
worldwide for CEN national Members.
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SIST EN ISO 15615:2023
EN ISO 15615:2022 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 15615:2023
EN ISO 15615:2022 (E)
European foreword
This document (EN ISO 15615:2022) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” the secretariat of which is held by DIN.
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 May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
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 supersedes EN ISO 15615:2013.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.
Endorsement notice
The text of ISO 15615:2022 has been approved by CEN as EN ISO 15615:2022 without any modification.
3
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SIST EN ISO 15615:2023
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SIST EN ISO 15615:2023
INTERNATIONAL ISO
STANDARD 15615
Third edition
2022-10
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
Reference number
ISO 15615:2022(E)
© ISO 2022
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SIST EN ISO 15615:2023
ISO 15615:2022(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
ii
© ISO 2022 – All rights reserved
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SIST EN ISO 15615:2023
ISO 15615:2022(E)
Contents Page
Foreword .iv
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
4 D e sig n . 2
5 R e qu i r ement s . 2
5.1 G eneral . 2
5.2 G eneral requirements . 2
5.2.1 M aterials . 2
5.2.2 E xternal gas leakage . 3
5.2.3 I nternal gas leakage . 3
5.2.4 I nternal gas leakage after decomposition test . 3
5.2.5 Pressure resistance . 3
5.2.6 A cetylene decomposition . 3
5.3 A dditional requirements to be met by specific types of devices . 3
5.3.1 Non-return valve . 3
5.3.2 A utomatic quick-acting shut-off device . 3
5.3.3 Automatic pressure-actuated shut-off valve . 3
5.3.4 T hree-way valve . 4
5.3.5 Stop valve . 4
5.3.6 Pressure gauge . 4
6 Ty p e t e s t i n g . 4
6.1 General . 4
6.2 R eference values and accuracy of instruments . 4
6.3 Test gases. 5
6.4 E xternal gas leakage . 5
6.5 I nternal gas leakage test . 5
6.6 P ressure resistance test . 5
6.7 A cetylene decomposition test . 5
6.7.1 General . 5
6.7.2 T est conditions . 5
6.7.3 Test procedure and test precautions . 6
6.7.4 Additional test conditions for certain devices . 6
6.8 N on-return valve test . 8
6.8.1 General . 8
6.8.2 R everse flow test for non-return valves . 8
6.8.3 Fatigue test for non-return valves . 9
6.9 E ndurance test for three-way valves, automatic pressure-actuated shut-off valves
and stop valves . 9
6.10 T rip pressure test for automatic pressure-actuated shut-off valves . 10
6.10.1 G eneral . 10
6.10.2 Equipment . 10
6 .10 . 3 Te s t pr o c e du r e. 10
7 M a nuf ac t ur er 's i ns t r uc t ions .11
8 M a rk i n g . .11
Annex A (normative) Summary of tests .13
Bibliography .16
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SIST EN ISO 15615:2023
ISO 15615:2022(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, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 121, Welding and allied
processes, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This third edition cancels and replaces the second edition (ISO 15615:2013), which has been technically
revised.
The main changes are as follows:
— the manual quick-acting shut-off valve has been removed because it is no longer state of the art;
— the remotely actuated shut-off valve has been removed because it is no longer state of the art;
— in 3.8 the definition of change-over unit has been added;
— in 5.2.6 a requirement has been added;
— in 5.3.4 the additional requirements for three-way valves have been clarified;
— in 5.3.6 specific requirements for pressure gauges have been added;
— new subclause 6.4 on external gas leakage test has been added;
— in 6.7.2 tolerances have been added;
— in 6.7.3 a minimum value for vacuum has been added;
— in 6.7.4.4 the test conditions for three-way valves have been clarified;
— 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;
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SIST EN ISO 15615:2023
ISO 15615:2022(E)
— in Clause 8 the kind of device has been added to the marking.
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. Official
interpretations of ISO/TC 44 documents, where they exist, are available from this page:
https://committee.iso.org/sites/tc44/home/interpretation.html.
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SIST EN ISO 15615:2023
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SIST EN ISO 15615:2023
INTERNATIONAL STANDARD ISO 15615:2022(E)
Gas welding equipment — Acetylene manifold systems
for welding, cutting and allied processes — Safety
requirements in high-pressure devices
1 S cope
This document establishes the general specifications, requirements and tests for devices located on the
1)
high-pressure side of acetylene manifold systems up to 2,5 MPa (25 bar) as defined in ISO 14114. It
does not apply to high-pressure piping, high-pressure flexible hoses or pressure regulators.
2 Normat ive 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.
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 processes
ISO 9539, Gas welding equipment — Materials for equipment used in gas welding, cutting and allied
processes
ISO 10297, Gas cylinders — Cylinder valves — Specification and type testing
ISO 15296:2017, Gas welding equipment — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15296 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
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, for example when triggered by an acetylene decomposition in the
high-pressure manifold pipework
[SOURCE: ISO 15296:2017, 3.4.10, modified — Definition revised.]
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
1
© ISO 2022 – All rights reserved
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SIST EN ISO 15615:2023
ISO 15615:2022(E)
3.3
automatic pressure-actuated shut-off valve
device that automatically stops the gas supply to the regulator when the downstream pressure rises
above the maximum operating pressure
Note 1 to entry: The terms “upstream”, “upstream side”, “downstream” and “downstream side” in this document
refer to the intended direction of gas flow in the device.
3.4
three-way valve
device that can be manually or automatically actuated and allows gas flow from one side or the other,
but not both sides, of the high-pressure manifold to enter the regulator while isolating flow from the
other side
3.5
stop valve
device that prevents 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 that shows the actual pressure of the assembly (digital or analogue readouts), for example 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 its bank of
cylinders or bundles by means of a pressure-actuated switching mechanism without interrupting the
supply
[SOURCE: ISO 14114:2017, 3.7, modified — Definition revised and note to entry 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 rate figures in this document shall be specified and measured under normal
conditions [0,101 3 MPa (1,013 bar), 23 °C].
5.2 General requirements
5.2.1 Materials
Materials used for devices shall be in accordance with ISO 9539.
2
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SIST EN ISO 15615:2023
ISO 15615:2022(E)
5.2.2 External gas leakage
The general requirements on external gas leakage shall be in accordance with ISO 9090 before and
after the tests except for the pressure resistance test. See 6.4 for test details.
5.2.3 Internal gas leakage
3
Where internal gas leakage is named in this document, the leakage rate shall not exceed 50 cm /h
2
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 leakage after decomposition test
Where internal gas leakage after acetylene decomposition is named, 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 devices
5.3.1 Non-return valve
3
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 with 6.8.2, before and
after the 2 000-cycle fatigue test carried out in accordance with 6.8.3.
These requirements do 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) and shall fulfil the requirements of 5.2.6. After tripping by acetylene
decomposition, the internal gas leakage shall meet the requirements of 5.2.4.
5.3.3 Automatic pressure-actuated shut-off valve
Automatic 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 6.10.3.1 (test 1) and 6.10.3.2 (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 6.10.3.3 (test 3) for details.
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SIST EN ISO 15615:2023
ISO 15615:2022(E)
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) pressure resistance test on high-pressure chambers in 5.2.5,
the internal chambers of the low-pressure signal port shall withstand a pressure of 6,0 MPa (60 bar)
for 5 min. During pressurization, there shall be no visible permanent deformation or leakage to the
atmosphere.
Automatic pressure shut-off valves shall meet the requirements of 5.2.3 before the decomposition test
(see 6.7) and after the endurance test (see 6.9).
5.3.4 Three-way valve
Three-way valves, when closed, shall meet the requirements of 5.2.3 before the decomposition test (see
6.7) and after the endurance test (see 6.9) and the requirements of 5.2.4 after the decomposition test.
Additional requirements for the decomposition test (see 6.7.4.4):
Sample 1: The three-way valve shall prevent the decomposition from passing through the isolated inlet
of the valve.
Sample 2: The three-way valve shall prevent the decomposition from passing through the isolated part
of the valve.
Sample 3: The three-way valve shall prevent the decomposition from passing through the isolated,
intended upstream side of the valve.
5.3.5 Stop valve
In the closed position, stop valves shall meet the requirements of 5.2.3 before the decomposition test
(see 6.7) and after the endurance test (see 6.9). After the decomposition test, the stop valves shall meet
the requirements of 5.2.4.
During the acetylene decomposition test, the stop valve shall prevent the decomposition from passing
downstream of the valve.
For valves with handwheels, the closing torque applied for the decomposition test shall be the endurance
test torque as defined in the endurance test for cylinder valves in ISO 10297.
5.3.6 Pressure gauge
If the pressure gauge is a Bourdon-tube pressure gauge, it shall fulfil the functions and safety
requirements specified in ISO 5171 in addition to the requirements of this document.
6 Type testing
6.1 General
The type test methods of 6.2 to 6.10 shall be applied to sample devices to be tested for conformity with
this document. Tests shall be carried out on new devices. The test order shall be carried out as specified
in Annex A, Table A.1.
6.2 R eference values and accuracy of instruments
The accuracy of the pressure-measuring instrument shall be within ± 3 % of the measured value. For
this purpose, the maximum measuring range (full scale) and class of the pressuremeasuring instrument
to be used shall be selected appropriately.
4
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SIST EN ISO 15615:
...
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/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)
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.
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oSIST prEN ISO 15615:2022
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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: 25.160.30
This 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
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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
ii
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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
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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.
iv
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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.
v
© ISO 2022 – All rights reserved
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oSIST prEN ISO 15615:2022
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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 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.
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 processes
ISO 9539, Gas welding equipment — Materials for equipment used in gas welding, cutting and allied
processes
ISO 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
1
© ISO 2022 – All rights reserved
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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.
2
© ISO 2022 – All rights reserved
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oSIST prEN ISO 15615:2022
ISO/DIS 15615.2:2022(E)
5.2.3 Internal gas tightness
3
Where internal gas tightness is required in this document, the leakage rate shall not exceed 50 cm /h
2
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 device
5.3.1 Non-return valve
3
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/DIS
15615:2020)
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: 25.160.30
THIS 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
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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 references
The 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
processes
ISO 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
3.4
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 2020 – All rights reserved 1
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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 side
Note 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 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.
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.
5.2.3 Internal gas tightness
Where internal gas tightness is required in this International Standard, the leakage rate shall not
3
exceed 50 cm /h for devices with a connection internal bore (diameter) less than 11 mm, or less than
2
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
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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
3
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 valve
Automatic 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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