prEN ISO 14114

• 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
• Publication Date: 15-Feb-2028
• ICS: 25.160.30 - Welding equipment
• Technical Committee: CEN/TC 121 - Welding
• Drafting Committee: CEN/TC 121/WG 19 - Equipment for gas welding, cutting and allied processes
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 27-Aug-2026
• Completion Date: 27-Aug-2026
• Ref Project: oSIST prEN ISO 14114:2026 - Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - General requirements (ISO/DIS 14114:2026)

• Revises: EN ISO 14114:2018 - Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - General requirements (ISO 14114:2017)
• Effective Date: 13-Nov-2024

prEN ISO 14114 is a draft standard from CEN based on ISO/DIS 14114:2026. It sets general requirements for acetylene manifold systems used in welding, cutting and allied processes, covering design, materials, testing, marking and instructions for use. It is aimed at designers, manufacturers, installers, and users who need to specify, build, check, or operate acetylene supply systems fed from cylinders or bundles.

What does prEN ISO 14114 specify?

prEN ISO 14114 specifies the requirements for acetylene cylinder manifold systems from the cylinder valve or bundle outlet connections up to the outlet connection of the main shut-off valve. The standard is for systems that collect gas from one or more acetylene cylinders or bundles for collective withdrawal in welding, cutting and allied processes.

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

Annex	What it covers
Annex A (normative)	Configurations of acetylene manifold systems, with component lists and example layouts

The standard also notes a specific exclusion: a single individual cylinder directly connected with a cylinder regulator according to ISO 2503 is outside its scope.

What are the key requirements of prEN ISO 14114?

prEN ISO 14114 requires the manifold system to include a defined set of components so acetylene can be withdrawn safely and without reverse flow. In practice, that means the designer must build in the right valves, regulators, safety devices and shut-off functions, and then verify the whole arrangement as a system.

System design and component layout

Clause 4.1 requires, among other items, a high pressure non-return valve immediately downstream of the cylinder or bundle outlet, high pressure pipework or hose to the manifold inlet, an automatic quick-acting shut-off device upstream of the manifold regulator, pressure regulators for manifold systems, low pressure pipework, safety devices at the low pressure outlet, and the main shut-off valve. For two-sided systems, a three-way valve may replace two high pressure stop valves. This matters because the system has to control flow direction, limit pressure, and isolate the supply in a way that matches the layout.

Safety devices and alternatives

Clause 4.1 also allows either the listed safety devices or, as an alternative, a decomposition blocker together with the specified supporting devices downstream. High pressure gauges have to meet ISO 15615, with limited exceptions for gauges integrated into devices already covered elsewhere. In practice, this affects what components can be bought separately and what can be accepted as a tested assembly.

Materials and resistance

Clause 4.2 requires materials resistant to acetylene, acetone and dimethylformamide (DMF), and to the mechanical, chemical and thermal loads expected in service. This is the material check that helps avoid incompatibility with gas service conditions.

Strength testing

Clause 5.1 requires strength testing of all high pressure and low pressure manifold components. The high pressure part is hydraulically tested at 315 bar for five minutes, and the low pressure part is pneumatically tested at a minimum of 24 bar unless other standards require more. The practical point is that components must survive likely service pressures without visible permanent deformation.

Tightness testing

Clause 5.2 requires on-site leak testing at commissioning by the installer. The high pressure part is tested at low pressure and at high pressure, and the low pressure part is tested at the maximum outlet pressure of the regulator. This matters because leak-tightness is checked after installation, not only at factory stage.

Marking and instructions

Clauses 6 and 7 require a permanently fixed plate with the document reference, supplier name or trademark, gas type, maximum regulated pressure, maximum flow at 15 °C, operating temperature range, and month and year of manufacture or installation. The supplier must also provide instructions covering application, system description, installation, commissioning tests, maintenance, disassembly, disposal, troubleshooting, hazards and safety precautions.

What terms does prEN ISO 14114 define?

prEN ISO 14114 defines key system terms so users can identify the parts of an acetylene manifold correctly.

• acetylene manifold systems - An assembly linking one or more gas sources to a user pipeline system and delivering regulated pressure under specified safe conditions.
• acetylene cylinder bundle - A set of cylinders fastened and interconnected for collective filling and gas withdrawal, intended to be transported as one unit.
• manifold high pressure pipework - The pipework from the cylinder or bundle outlet at full charging pressure to the inlet of the pressure regulator.
• flame arrestor - A device that extinguishes a flame front.
• temperature-sensitive cut-off valve - A device that stops gas flow when a predetermined temperature is reached.
• pressure-sensitive cut-off valve - A device that stops gas flow when downstream pressure exceeds upstream pressure by more than a set value.
• change-over unit - A device that switches supply from either side of a two-sided system without interrupting gas supply.
• decomposition blocker - A safety device that stops acetylene decomposition using a temperature- or pressure-sensitive cut-off device.

Who uses prEN ISO 14114?

prEN ISO 14114 is used by manufacturers, suppliers, distributors and installers of acetylene manifold systems, because it defines what must be built, marked and documented. It is also used by designers, test personnel, and maintenance teams who need to assemble, commission, inspect or refurbish systems for gas welding, cutting and allied processes.

Buyers, quality managers and compliance teams use it to compare offered systems against a common technical basis. In practice, it helps them check whether a manifold system includes the required safety devices, test evidence and user instructions.

What changed in prEN ISO 14114 from the previous edition?

prEN ISO 14114 replaces the second edition, ISO 14114:2014. The foreword states these technical changes from the previous edition:

• Clause 3 restructured
• 4.1 revised
• 5.3 revised
• Clause 6 revised
• Clause 7 revised
• Table A.1 revised
• Figures A.2 and A.4 revised
• Figure A.5 deleted
• Title of Annex B modified

Which standards are used with prEN ISO 14114?

prEN ISO 14114 refers to several companion standards that provide the detailed requirements for parts and methods used in the manifold system:

• ISO 5175 (all parts) - safety devices for gas welding equipment
• ISO 7291:2010 - pressure regulators for manifold systems up to 30 MPa
• ISO 9090 - gas tightness of equipment for gas welding and allied processes
• ISO 9539 - materials for equipment used in gas welding, cutting and allied processes
• ISO 10961 - design, manufacture, testing and inspection of cylinder bundles
• ISO 14113 - rubber and plastics hose and hose assemblies up to 450 bar
• ISO 15296 - vocabulary used for gas welding equipment
• ISO 15615:2013 - safety requirements in high-pressure devices for acetylene manifold systems

What does the prEN ISO 14114 document contain?

The document contains the technical requirements and test methods for acetylene manifold systems, together with a normative annex of example configurations. Annex A includes drawings for one-sided and two-sided cylinder or bundle systems and a table that maps the numbered parts used in those figures.

It also contains the procedures for strength testing and external gas tightness testing, so a system can be checked before use and at commissioning. The marking and instructions clauses show what information must be supplied to the installer and end user.

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
...