ISO 7289:2018

Gas welding equipment - Quick-action couplings with shut-off valves for welding, cutting and allied processes

This document defines the specifications and the type tests for quick-action couplings with shut-off valves. It applies to quick-action couplings used between the regulator and the torch in equipment for gas welding, cutting and allied processes. This document applies to cases where these couplings are used with hoses in accordance with ISO 3821 or threaded unions in accordance with ISO/TR 28821.

Matériel de soudage aux gaz — Raccords rapides à obturation pour soudage, coupage et techniques connexes

General Information

• Status: Published
• Publication Date: 12-Dec-2018
• ICS: 25.160.30 - Welding equipment
• Technical Committee: ISO/TC 44/SC 8 - Equipment for gas welding, cutting and allied processes
• Drafting Committee: ISO/TC 44/SC 8 - Equipment for gas welding, cutting and allied processes
• Current Stage: 9093 - International Standard confirmed
• Start Date: 24-May-2024
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 7289:2010 - Gas welding equipment - Quick-action couplings with shut-off valves for welding, cutting and allied processes
• Effective Date: 23-Apr-2016

Overview

ISO 7289:2018 specifies requirements and type tests for quick-action couplings with shut-off valves used in gas welding, cutting and allied processes. The standard covers couplings installed between the regulator and the torch (with hoses conforming to ISO 3821 or threaded unions per ISO/TR 28821) and defines design, installation, material and performance requirements so coupling/uncoupling can be performed safely while equipment remains pressurized.

Key topics and technical requirements

• Scope and application: Applies to couplings used between regulator and torch for gas welding, cutting and allied processes.
• Coupling types: Three gas-specific types defined - Type O (oxygen), Type F (fuel gas) and Type N (other welding gases) - to prevent accidental interchange.
• Dimensions and interchangeability: Standardizes critical dimensions (including a minimum length for the internal diameter) so that elements of different gas types are non-interchangeable while couplings of the same type remain interchangeable across manufacturers.
• Shut-off configuration: The shut-off device must be located in the female element; gas-tight sealing is provided on the cylindrical shaft surface.
• Materials and hardness: Materials must meet ISO 9539 requirements. Male elements must be from uncoated material with a surface hardness ≥ 270 HV10 (higher surface-hardness criteria apply for certain coated materials).
• Performance / working requirements:
  • Designed for a maximum working pressure of 2 MPa (20 bar).
  • Type-testing includes pressure-resistance (test pressures up to 4 MPa and 6 MPa specified), gas tightness, pressure drop, flashback resistance, tensile and radial load resistance, and endurance.
• Coupling/uncoupling: Must be operable without tools, resist accidental disengagement (e.g., not by simple rotation or by longitudinal traction < 1 kN), and the shut-off must operate automatically on uncoupling.
• Marking and user instructions: Requirements for identification and instructions for safe use are specified.

Applications and who uses this standard

ISO 7289:2018 is relevant to:

• Manufacturers of welding and cutting torches, regulators and hose assemblies (product design and production).
• Test laboratories and conformity assessment bodies performing type tests and certification.
• Procurement, quality and safety engineers specifying compliant quick-action couplings for workshops, fabrication shops, shipyards and industrial maintenance.
• Equipment installers and maintenance teams ensuring safe installation (female shut-off upstream) and correct gas-specific connections.

Related standards

• ISO 3821 - hoses for gas welding and allied processes
• ISO/TR 28821 - threaded unions recommendations
• ISO 9539 - materials for welding equipment
• ISO 5175-1, ISO 9090, ISO 6150, ISO 15296 - normative references used for testing, vocabulary and related safety/devices

Keywords: ISO 7289:2018, quick-action couplings, shut-off valves, gas welding, cutting, hose ISO 3821, threaded unions ISO/TR 28821, pressure resistance, gas tightness, coupling interchangeability.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7289
Fourth edition
2018-12
Corrected version
2021-08
Gas welding equipment — Quick-
action couplings with shut-off valves
for welding, cutting and allied
processes
Matériel de soudage aux gaz — Raccords rapides à obturation pour
soudage, coupage et techniques connexes
Reference number
©
ISO 2018
© ISO 2018
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types of coupling . 2
5 Installation . 2
6 Design requirement . 2
6.1 Dimensions, non-interchangeability and interchangeability . 2
6.2 Configuration . 2
6.3 Coupling and uncoupling . 3
6.4 Connections . 3
6.5 Materials . 3
7 Working requirements . 4
7.1 Pressure resistance . 4
7.2 Gas tightness . 4
7.2.1 General requirements . 4
7.2.2 Specific requirements . 4
7.3 Pressure drop . 4
7.4 Resistance to flashback . 4
7.5 Resistance to tensile load . 4
7.6 Resistance to radial loads . 4
7.7 Endurance . 5
7.8 Other functions . 5
8 General test conditions . 5
8.1 General . 5
8.2 Test sequence . 6
9 Test procedure . 7
9.1 Examination of dimensions and test of non-interchangeability and interchangeability . 7
9.1.1 Dimensions . 7
9.1.2 Non-interchangeability between different gas types . 7
9.1.3 Interchangeability within a single gas type . 7
9.2 Pressure resistance . 8
9.3 Gas tightness test . 8
9.3.1 General. 8
9.3.2 Basic method and test device . . 8
9.3.3 Particular specifications . 8
9.4 Flashback test . 8
9.5 Resistance to tensile load . 8
9.6 Resistance to radial load . 9
9.7 Endurance test . 9
10 Marking . 9
11 Instructions for use . 9
Bibliography .10
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 7289:2010), which has been technically
revised. The main changes compared to the previous edition are as follows:
a) normative references have been updated;
b) Subclause 6.2 has been updated;
c) in 6.5, requirements for coated material have been added;
d) in 8.1, accuracy of pressure and flow measurement have been added;
e) old Subclause 8.3 has been updated and incorporated in 9.1;
f) Subclause 9.4 has been updated;
g) Clause 10 has been updated.
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.
This corrected version of ISO 7289:2018 incorporates the following correction:
— representation of the dimension of diameter B in Figure 1 has been corrected to keep the full
interchangeability and standard dimensions in line with the previous edition (ISO 7289:2010).
iv © ISO 2018 – All rights reserved

Introduction
Quick-action couplings with shut-off valves are used in equipment for gas welding, cutting and allied
processes to connect the hoses used between the regulator and the torch, either to one another or to
the regulators and the torches themselves.
These couplings are fitted with shut-off devices that interrupt the gas flow when the two elements
are disconnected, so that coupling and uncoupling operations can be performed manually while the
equipment is under pressure.
INTERNATIONAL STANDARD ISO 7289:2018(E)
Gas welding equipment — Quick-action couplings with
shut-off valves for welding, cutting and allied processes
1 Scope
This document defines the specifications and the type tests for quick-action couplings with shut-off
valves. It applies to quick-action couplings used between the regulator and the torch in equipment for
gas welding, cutting and allied processes.
This document applies to cases where these couplings are used with hoses in accordance with ISO 3821
or threaded unions in accordance with ISO/TR 28821.
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 5175-1:2017, Gas welding equipment — Safety devices — Part 1: Devices incorporating a flame
(flashback) arrestor
ISO 6150, Pneumatic fluid power — Cylindrical quick-action couplings for maximum working pressures
of 10 bar, 16 bar and 25 bar (1 MPa, 1,6 MPa, and 2,5 MPa) — Plug connecting dimensions, specifications,
application guidelines and testing
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 15296, 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 terminological databases for use in standardization at th
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