oSIST prEN ISO 14114:2026

• Abstract:

  ISO 14114:2017 applies to acetylene cylinder manifold systems extending from the cylinder valve or the bundle outlet connections to the outlet connection of the main shut-off valve. It specifies requirements for design, materials and testing of cylinder manifold systems for the supply of acetylene for use in welding, cutting and allied processes.; ISO 14114:2017 applies to acetylene cylinder manifold systems in which acetylene single cylinders or acetylene bundles are coupled for collective gas withdrawal.; NOTE National regulations exist regarding limitation of the amount of single cylinders/bundles of acetylene on a single location (e.g. in warehouse or connected to a manifold system).; ISO 14114:2017 also covers a test procedure for decomposition blockers.

• Status: Not Published
• Public Enquiry End Date: 01-Nov-2026
• ICS: 25.160.30 - Welding equipment
• Technical Committee: VAR - Welding
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 02-Sep-2026
• Due Date: 20-Jan-2027
• Ref Project: prEN ISO 14114 - Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - General requirements (ISO/DIS 14114:2026)

• Revises: SIST EN ISO 14114:2018 - Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - General requirements (ISO 14114:2017)
• Effective Date: 01-Oct-2026

Overview

oSIST prEN ISO 14114:2026 specifies the general requirements for acetylene manifold systems used in gas welding, cutting, and allied processes. This international standard applies to systems comprising acetylene cylinders or bundles that are manifolded together for collective gas withdrawal. The standard outlines the requirements for the design, materials, testing, and marking of these manifold systems to ensure operational safety and efficiency. Developed by the Slovenian Institute for Standardization (SIST) and based on ISO/DIS 14114:2026, it targets equipment connecting from the cylinder valve or bundle outlet to the main shut-off valve's outlet.

Key Topics

• System Scope: The standard applies to acetylene manifold systems for welding, cutting, and related applications, covering both single and multiple cylinders or bundles linked together.
• Design and Material Requirements: It mandates the use of materials resistant to acetylene and associated environmental factors, and defines essential components such as pressure regulators, flame arrestors, non-return valves, and shut-off valves.
• Testing: Requirements are included for hydraulic and pneumatic testing of both high-pressure and low-pressure components to ensure leak-tightness and robustness under operational pressures.
• Safety Devices: Integration of devices like flame arrestors, automatic shut-off valves, and decomposition blockers is specified to safeguard against acetylene decomposition and backflow.
• Marking and Documentation: Systems must be clearly and permanently marked with information including maximum operating pressure and temperature, gas type, manufacturer details, and reference to the standard.
• Instructions for Use: Manufacturers and installers are required to provide comprehensive instructions for installation, commissioning, operation, maintenance, and troubleshooting.

Applications

oSIST prEN ISO 14114:2026 is essential in environments where acetylene gas is supplied to welding and cutting equipment via manifold systems, including:

• Industrial Fabrication: Factories and workshops where acetylene is used for processes like oxy-acetylene welding, metal cutting, brazing, and heating.
• Maintenance Facilities: Sites maintaining or repairing heavy equipment that require a reliable acetylene gas supply.
• Construction Sites: Temporary or fixed acetylene manifold systems used for on-site fabrication, pipework installation, and structural repairs.
• Educational Institutions: Training facilities that demonstrate safe installation and use of acetylene supply systems in welding and cutting technology courses.

Related Standards

To ensure the safety and compatibility of system components, oSIST prEN ISO 14114:2026 references several related standards:

• ISO 5175 (all parts): Gas welding equipment - Safety devices
• ISO 7291: Gas welding equipment - Pressure regulators for manifold systems
• ISO 9090: Gas tightness of equipment for gas welding
• ISO 9539: Gas welding equipment - Materials for equipment used in welding, cutting, and allied processes
• ISO 10961: Gas cylinders - Cylinder bundles - Design and testing
• ISO 14113: Gas welding equipment - Rubber and plastics hose and hose assemblies for industrial gases
• ISO 15296: Gas welding equipment - Vocabulary
• ISO 15615: Safety requirements in high-pressure devices for acetylene manifold systems

Practical Value

Implementing oSIST prEN ISO 14114:2026 helps organizations:

• Enhance Safety: Following standardized requirements for acetylene manifold systems minimizes risks of leaks, decompositions, and equipment failure.
• Regulatory Compliance: Assists companies in meeting national safety regulations and international best practices for gas welding systems.
• Improve Reliability: Ensures robust system design and proper testing, contributing to reduced downtime and safer operations.
• Facilitate Maintenance: Clear guidance on marking, documentation, and instructions streamlines system identification and ongoing maintenance.

Adopting this standard is instrumental for any facility handling acetylene gas with manifold systems, supporting both operational excellence and workplace safety.

SLOVENSKI STANDARD
01-oktober-2026
Oprema za plamensko varjenje - Baterije jeklenk z acetilenom za varjenje, rezanje
in sorodne postopke - Splošne zahteve (ISO/DIS 14114:2026)
Gas welding equipment - Acetylene manifold systems for welding, cutting and allied
processes - General requirements (ISO/DIS 14114:2026)
Gasschweißgeräte - Acetylenflaschen-Batterieanlagen für Schweißen, Schneiden und
verwandte Verfahren - Allgemeine Anforderungen (ISO/DIS 14114:2026)
Matériel de soudage aux gaz - Centrales de détente pour la distribution d'acétylène pour
le soudage, le coupage et les techniques connexes - Exigences générales (ISO/DIS
14114:2026)
Ta slovenski standard je istoveten z: prEN ISO 14114
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 14114
ISO/TC 44/SC 8
Gas welding equipment — Acetylene
Secretariat: DIN
manifold systems for welding,
Voting begins on:
cutting and allied processes —
2026-08-28
General requirements
Voting terminates on:
2026-11-20
Matériel de soudage aux gaz — Centrales de détente pour
la distribution d'acétylène pour le soudage, le coupage et les
techniques connexes — Exigences générales
ICS: 25.160.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO/DIS 14114:2026(en)
DRAFT
ISO/DIS 14114:2026(en)
International
Standard
ISO/DIS 14114
ISO/TC 44/SC 8
Gas welding equipment — Acetylene
Secretariat: DIN
manifold systems for welding,
Voting begins on:
cutting and allied processes —
General requirements
Voting terminates on:
Matériel de soudage aux gaz — Centrales de détente pour
la distribution d'acétylène pour le soudage, le coupage et les
techniques connexes — Exigences générales
ICS: 25.160.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 14114:2026(en)
ii
ISO/DIS 14114:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Design and materials . 4
4.1 Requirements for the manifold system and its components .4
4.2 Materials of construction .5
5 Tests . 5
5.1 Strength test .5
5.2 External gas tightness test .5
6 Marking . . 6
7 Instructions for use . . 6
Annex A (normative) Configurations of acetylene manifold systems. 7

iii
ISO/DIS 14114:2026(en)
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
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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
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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 third edition cancels and replaces the second edition (ISO 14114:2014), which has been technically
revised with the following changes:
a) Clause 3 has been restructured;
b) 4.1 has been revised;
c) 5.3 has been revised;
d) Clause 6 has been revised;
e) Clause 7 has been revised;
f) Table A.1 has been revised;
g) Figures A.2 and A.4 have been revised and Figure A.5 has been deleted;
h) the title of Annex B has been modified.
Requests for official interpretations of 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.
iv
DRAFT International Standard ISO/DIS 14114:2026(en)
Gas welding equipment — Acetylene manifold systems
for welding, cutting and allied processes — General
requirements
1 Scope
This document applies to acetylene manifold systems extending from the cylinder valve or the bundle
outlet connections to the outlet connection of the main shut-off valve. It specifies requirements for design,
materials and testing of cylinder manifold systems for the supply of acetylene for use in welding, cutting and
allied processes.
This document applies to acetylene manifold systems in which one of the following acetylene sources is used
or connected for collective gas withdrawal:
— Single individual cylinder;
— Multiple cylinders;
— Single individual bundle;
— Multiple bundles,
When a single individual cylinder with cylinder regulator according to ISO 2503 is directly connected to the
cylinder valve, this document does not apply.
NOTE National regulations exist regarding limitation of the amount of single cylinders/bundles of acetylene on a
single location (e.g. in warehouse or connected to a manifold system).
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 (all parts), Gas welding equipment — Safety devices
ISO 7291:2010, Gas welding equipment — Pressure regulators for manifold systems used in welding, cutting and
allied processes up to 30 MPa (300 bar)
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 10961, Gas cylinders — Cylinder bundles — Design, manufacture, testing and inspection
ISO 14113, Gas welding equipment — Rubber and plastics hose and hose assemblies for use with industrial gases
up to 450 bar (45 MPa)
ISO 15296, Gas welding equipment — Vocabulary
ISO 15615:2013, Gas welding equipment — Acetylene manifold systems for welding, cutting and allied processes
— Safety requirements in high-pressure devices

ISO/DIS 14114:2026(en)
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 https:// www .electropedia .org/
3.1
acetylene manifold systems
assembly of devices linking one or more gas sources coupled to a user pipeline system, delivering a regulated
pressure under specified safe conditions
Note 1 to entry: A manifold includes, for example, components like collectors, safety devices, and pressure regulators.
3.2
acetylene cylinder bundle
acetylene cylinder pack
assembly of cylinders fastened together, interconnected by a manifold for collective filling and gas
withdrawal, and intended to be transported as a single unit
3.3
manifold high pressure pipework
pipework system extending from the outlet connection of acetylene cylinders or bundles at full charging
pressure to the inlet of the pressure regulator, including as required hose assemblies or coiled metal pipes,
piping and high pressure valves
3.4
flame arrestor
device which extinguish
...