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

oSIST prEN ISO 14114:2026 is the SIST publication of the draft ISO 14114 standard for gas welding equipment, focused on acetylene manifold systems for welding, cutting and allied processes. It specifies general requirements for design, materials, testing, marking and instructions for use so manufacturers, installers and users can handle acetylene supplied from single cylinders, multiple cylinders, single bundles or multiple bundles under collective gas withdrawal.

What does oSIST prEN ISO 14114:2026 specify?

oSIST prEN ISO 14114:2026 applies to acetylene manifold systems from the cylinder valve or bundle outlet connections up to the outlet connection of the main shut-off valve. It covers systems used for collective withdrawal from one or more acetylene cylinders or bundles, and it excludes a single individual cylinder directly connected with a cylinder regulator according to ISO 2503.

The document is organized into Scope, Normative references, Terms and definitions, Design and materials, Tests, Marking, Instructions for use, and Annex A.

Annex	What it covers
Annex A	Normative configurations of acetylene manifold systems, with figures and a component list

What are the key requirements of oSIST prEN ISO 14114:2026?

oSIST prEN ISO 14114:2026 focuses on the system layout, the gas safety devices, the material suitability, and the tests needed before a manifold system is put into service. The practical aim is to make sure the system can supply acetylene safely, be checked on site, and be identified clearly.

System design and safety devices

Clause 4.1 requires a defined chain of components in the manifold system, including high pressure non-return protection, connection pipework or hoses, an automatic quick-acting shut-off device, pressure regulation, a main isolation function, low pressure pipework, low-pressure safety devices, gauges and the main shut-off valve. In practice, the system must prevent reverse flow, isolate the supply, control pressure and provide flame and decomposition protection where needed.

Clause 4.1 also allows alternative safety-device arrangements, including a decomposition blocker with associated non-return valve, flame arrestor and cut-off device. Annex A gives the allowed configurations, so installers can build one-sided, two-sided, cylinder or bundle systems in the approved pattern.

Materials

Clause 4.2 requires materials that are resistant to acetylene, acetone and dimethylformamide (DMF), and to the mechanical, chemical and thermal loads expected in service. For a buyer or designer, this means material choice is part of compliance, not only a manufacturing preference.

Tests

Clause 5.1 requires strength testing of both high-pressure and low-pressure components, with hydraulic testing for the high-pressure part and pneumatic testing for the low-pressure part. The practical point is that components must survive the service pressures without visible permanent deformation.

Clause 5.2 requires external gas-tightness testing at commissioning on site. The high-pressure part is checked at low and high pressure, and the low-pressure part is checked at the maximum outlet pressure of the regulator, so the installer has to prove the assembled system is leak-tight before use.

Marking and instructions for use

Clause 6 requires the installer to mark the system with the document reference, supplier identity, gas type, maximum regulated pressure, maximum flow, operating temperature range, and year and month of manufacture or installation. Clause 7 requires instructions for use covering the application, description and marking, installation, commissioning tests, operation, maintenance, disassembly, disposal, troubleshooting, hazards and safety precautions.

What terms does oSIST prEN ISO 14114:2026 define?

• Acetylene manifold systems - an assembly that connects one or more gas sources to a user pipeline system and delivers regulated pressure under safe conditions.
• Acetylene cylinder bundle - a group of cylinders fastened and interconnected for collective filling and gas withdrawal, intended to be transported as one unit.
• Change-over unit - a device in a two-sided system that switches supply from one bank of cylinders or bundles to the other without interrupting gas flow.
• Decomposition blocker - a safety device that stops acetylene decomposition by using a temperature-sensitive or pressure-sensitive cut-off device.
• Pressure regulator for manifold systems - a device that reduces a variable inlet pressure to as constant an outlet pressure as possible.
• Flame arrestor - a device that extinguishes a flame front.

Who uses oSIST prEN ISO 14114:2026?

This standard is used by manufacturers, suppliers, distributors and installers of acetylene manifold systems. It is also relevant to engineers, maintenance staff, testers and inspectors who design, assemble, commission and verify systems for welding, cutting and allied processes.

Buyers and quality managers use it when specifying manifold components, safety devices, marking and user instructions for acetylene installations. The document is particularly relevant where cylinders, bundles and change-over systems are used in industrial gas supply.

What changed in oSIST prEN ISO 14114:2026 from the previous edition?

The foreword says that this third edition cancels and replaces ISO 14114:2014. It reports revisions to Clause 3, 4.1, 5.3, Clauses 6 and 7, Table A.1, Figures A.2 and A.4, deletion of Figure A.5, and a modified title for Annex B.

Which standards are used with oSIST prEN ISO 14114:2026?

The document relies on ISO 5175 (all parts) for safety devices, including flame arrestors, non-return valves and cut-off devices. It uses ISO 7291 for pressure regulators and change-over units, ISO 9090 for gas-tightness, ISO 9539 for materials, ISO 10961 for cylinder bundles, ISO 14113 for hoses and hose assemblies, ISO 15296 for vocabulary, and ISO 15615 for high-pressure device requirements and the valve and gauge components named in Clause 4.

What does the oSIST prEN ISO 14114:2026 document contain?

The document contains the full requirement set for acetylene manifold systems, from scope and definitions through design, testing, marking and user information. Annex A adds the normative system configurations, with Figures A.1 to A.4 and Table A.1 listing the numbered components used in those drawings. That annex is the practical guide for arranging one-sided and two-sided systems, bundles, cylinders, change-over units and decomposition blockers.

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
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 on 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 the following URL:
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
...