SIST EN ISO 5171:2019

SLOVENSKI STANDARD
SIST EN ISO 5171:2019
01-oktober-2019
Nadomešča:
SIST EN ISO 5171:2011
Oprema za plamensko varjenje - Manometri za varjenje, rezanje in sorodne tehnike
(ISO 5171:2019)
Gas welding equipment - Pressure gauges used in welding, cutting and allied processes
(ISO 5171:2019)
Gasschweißgeräte - Manometer für Schweißen, Schneiden und verwandte Prozesse
(ISO 5171:2019)
Matériel de soudage au gaz - Manomètres utilisés pour le soudage, le coupage et les
techniques connexes (ISO 5171:2019)
Ta slovenski standard je istoveten z: EN ISO 5171:2019
ICS:
17.100 Merjenje sile, teže in tlaka Measurement of force,
weight and pressure
25.160.30 Varilna oprema Welding equipment
SIST EN ISO 5171:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 5171:2019

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SIST EN ISO 5171:2019


EN ISO 5171
EUROPEAN STANDARD

NORME EUROPÉENNE

May 2019
EUROPÄISCHE NORM
ICS 25.160.30 Supersedes EN ISO 5171:2010
English Version

Gas welding equipment - Pressure gauges used in welding,
cutting and allied processes (ISO 5171:2019)
Matériel de soudage au gaz - Manomètres utilisés pour Gasschweißgeräte - Manometer für Schweißen,
le soudage, le coupage et les techniques connexes (ISO Schneiden und verwandte Prozesse (ISO 5171:2019)
5171:2019)
This European Standard was approved by CEN on 5 May 2019.

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, Turkey 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 5171:2019 E
worldwide for CEN national Members.

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SIST EN ISO 5171:2019
EN ISO 5171:2019 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 5171:2019
EN ISO 5171:2019 (E)
European foreword
This document (EN ISO 5171:2019) 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 November 2019, and conflicting national standards
shall be withdrawn at the latest by November 2019.
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 5171:2010.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 5171:2019 has been approved by CEN as EN ISO 5171:2019 without any modification.

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SIST EN ISO 5171:2019

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SIST EN ISO 5171:2019
INTERNATIONAL ISO
STANDARD 5171
Fourth edition
2019-05
Gas welding equipment — Pressure
gauges used in welding, cutting and
allied processes
Matériels de soudage au gaz — Manomètres utilisés pour le soudage,
le coupage et les techniques connexes
Reference number
ISO 5171:2019(E)
©
ISO 2019

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SIST EN ISO 5171:2019
ISO 5171:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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 2019 – All rights reserved

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SIST EN ISO 5171:2019
ISO 5171:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Pressure . 2
4.1 Unit of pressure . 2
4.2 Maximum scale reading. 2
4.3 Maximum pressure mark . 2
5 Manufacturing requirements . 3
5.1 Materials . 3
5.1.1 General. 3
5.1.2 Oxygen pressure gauges . 3
5.2 Design and dimensions . 4
5.2.1 Operational equipment . 4
5.2.2 Dimensions . 4
5.2.3 Dial and pointer . 8
6 Safety . 8
7 Marking . 8
8 Tests . 9
8.1 General . 9
8.2 Accuracy .10
8.3 Torsion test.10
8.4 Bend test .11
8.5 Case vent test .12
8.6 Overpressure and leakage test .13
8.6.1 Test A .13
8.6.2 Test B .14
8.7 Flammability test .14
Bibliography .15
© ISO 2019 – All rights reserved iii

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SIST EN ISO 5171:2019
ISO 5171:2019(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.
This fourth edition cancels and replaces the third edition (ISO 5171:2009) which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Clause 7 has been revised;
— Clause 8 has been clarified regarding the amount of test samples to be used;
— editorial changes have been made;
— test B has been added in 5.2.1.2.3 for supplementary leakage rate under the testing conditions of 8.7.2.
Any feedback, question or request for official interpretation related to any aspect of this document
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/members .html. Official interpretations, where they
exist, are available from this page: https: //committee .iso .org/sites/tc44/home/interpretation .html.
iv © ISO 2019 – All rights reserved

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SIST EN ISO 5171:2019
INTERNATIONAL STANDARD ISO 5171:2019(E)
Gas welding equipment — Pressure gauges used in
welding, cutting and allied processes
1 Scope
This document specifies requirements for Bourdon-tube pressure gauges normally used with
compressed gas systems at pressures up to 30 MPa (300 bar) in welding, cutting and allied processes. It
also covers use for dissolved acetylene and for liquefied gases under pressure.
It does not cover gauges for acetylene in acetylene-manufacturing plants.
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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of
preferred numbers
ISO 4589-2:2017, Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-
temperature test
ISO 9539, Gas welding equipment — Materials for equipment used in gas welding, cutting and allied
processes
ISO 10102, Assembly tools for screws and nuts — Double-headed open-ended engineers' wrenches —
Outside dimensions
ISO 14114, Gas welding equipment — Acetylene manifold systems for welding, cutting and allied processes —
General requirements
ISO 15296, Gas welding equipment — Vocabulary
1)
ANSI/ASME B1.20.1 , Pipe threads, general purpose (inch)
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 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 http: //www .electropedia .org/
1) Published by and available from the American National Standards Institute (ANSI), 11 West 42nd Street,
New York, NY 10036.
© ISO 2019 – All rights reserved 1

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SIST EN ISO 5171:2019
ISO 5171:2019(E)

3.1
Bourdon tube pressure gauge
device incorporating elastic tube with direct indication by pointer (3.5) and graduated scale (3.7) of the
pressure being measured
3.2
case
outer housing that contains the Bourdon tube and the movement (if existing)
3.3
dial
plate or area on which the scale (3.7) is marked
3.4
flange
circular extension of the case (3.2) used for mounting
3.5
pointer
indicator whose position in relation to the scale (3.7) indicates the value of the measured pressure
3.6
pointer stop
projection that stops the travel of the pointer (3.5)
3.7
scale
array of marks, together with any associated figuring, in relation to which the position of the pointer
(3.5) is observed
3.8
vent
blowout safety device or venting area incorporated in the gauge to permit the rapid safe dissipation
...