EN ISO 10156:2017/A1:2026
(Amendment)Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets - Amendment 1 (ISO 10156:2017/Amd 1:2026)
- Status
- Not Published
- Publication Date
- 13-Oct-2026
- Technical Committee
- CEN/TC 23 - Transportable gas cylinders
- Drafting Committee
- CEN/TC 23/WG 20 - Cylinder design - Fittings
- Current Stage
- 6055 - CEN Ratification completed (DOR) - Publishing
- Start Date
- 20-Jun-2026
- Completion Date
- 20-Jun-2026
EN ISO 10156:2017/A1:2026 is a draft CEN amendment to ISO 10156:2017. It updates the method used to determine the fire potential and oxidizing ability of gases and gas mixtures when selecting cylinder valve outlets, so it matters to anyone classifying gases for cylinder and valve compatibility.
What does EN ISO 10156:2017/A1:2026 specify?
EN ISO 10156:2017/A1:2026 specifies targeted changes to the base standard’s calculation and reference list. The amendment affects Clause 5.3.2, Table 4, and the Bibliography.
The document is organized as amendment instructions rather than a full standalone method. In practice, users apply the change to the existing EN ISO 10156:2017 text when they determine how a gas or gas mixture should be handled for cylinder valve outlet selection.
What are the key requirements of EN ISO 10156:2017/A1:2026?
EN ISO 10156:2017/A1:2026 makes one technical correction that affects the calculation used in the base standard. It also adds a supporting reference in the Bibliography.
Updated Table 4 coefficient
Clause 5.3.2, Table 4 replaces the Ci coefficient for Fluorine. The amended value is the one to use in the fire-potential and oxidizing-ability determination.
In practice, this matters because the coefficient feeds the classification logic used for gas mixtures. Anyone applying the standard to select a cylinder valve outlet must use the updated coefficient rather than the earlier one.
Application to gas mixture evaluation
EN ISO 10156:2017/A1:2026 continues to support the assessment of gases and gas mixtures for their fire potential and oxidizing ability. The amendment does not change the overall purpose of the base standard; it refines one input to the method.
For users, that means the amendment is not a separate procedure. It is a correction that must be folded into the existing determination method so the result matches the revised table.
Use with cylinder valve outlet selection
The standard remains focused on selecting cylinder valve outlets for gases and gas mixtures. The updated coefficient helps the user decide which outlet arrangement is appropriate for a given gas or mixture.
In practical terms, this is a safety and compatibility check. The result affects how cylinders are connected and what outlet types are used in handling, distribution, and use.
Added background reference
The Bibliography gains a report by Schröder on determining the oxidizing ability of gases and gas mixtures for ISO/TC 58/SC 2/WG 7 at BAM, July 1999.
For readers, this shows the technical background linked to the oxidizing-ability work. It can help when tracing the method’s basis or explaining why the amended coefficient matters.
What terms does EN ISO 10156:2017/A1:2026 define?
- Fire potential - the characteristic used in this standard to judge whether a gas or gas mixture presents a fire-related concern for valve outlet selection.
- Oxidizing ability - the tendency of a gas or gas mixture to support combustion, which is part of the outlet-selection method.
- Cylinder valve outlets - the valve outlet connection on a gas cylinder that the standard helps users select.
- Gas mixtures - combinations of gases assessed together rather than as single components.
- Ci coefficient - the coefficient listed in Table 4 and used in the standard’s calculation method.
- Fluorine - the gas named in Table 4 whose Ci coefficient is updated by this amendment.
- Bibliography - the reference list at the end of the document, which this amendment extends with one added report.
Who uses EN ISO 10156:2017/A1:2026?
EN ISO 10156:2017/A1:2026 is used by people who specify, manufacture, supply, or assess gas cylinders and their valve outlets. That includes gas producers, cylinder manufacturers, valve designers, safety and quality staff, and technical buyers working with industrial gases.
They use it when they need to classify gases or mixtures for outlet selection and when they need a consistent technical basis for handling oxidizing or fire-related hazards.
What changed in EN ISO 10156:2017/A1:2026 from the previous edition?
EN ISO 10156:2017/A1:2026 updates the base standard in two places:
- Clause 5.3.2, Table 4: the Ci coefficient for Fluorine is changed from 40 to 7,56.
- Bibliography: a report by Schröder on determining oxidizing ability is added as reference [12].
What does the EN ISO 10156:2017/A1:2026 document contain?
EN ISO 10156:2017/A1:2026 contains amendment instructions only, not a full rewrite of the gas-classification method. The technical content is concentrated in one table change in Clause 5.3.2 and one new bibliographic reference.
For someone applying the standard, the important task is to carry the revised Fluorine coefficient into the existing determination method. For someone documenting a conformity or safety decision, the added report provides a cited technical background for the oxidizing-ability work.
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 23-Oct-2024
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Frequently Asked Questions
EN ISO 10156:2017/A1:2026 is a draft published by the European Committee for Standardization (CEN). Its full title is "Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets - Amendment 1 (ISO 10156:2017/Amd 1:2026)". This standard covers: Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets - Amendment 1 (ISO 10156:2017/Amd 1:2026)
Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets - Amendment 1 (ISO 10156:2017/Amd 1:2026)
EN ISO 10156:2017/A1:2026 is classified under the following ICS (International Classification for Standards) categories: 23.020.35 - Gas cylinders; 71.100.20 - Gases for industrial application. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 10156:2017/A1:2026 has the following relationships with other standards: It is inter standard links to ISO 10156:2017/Amd 1:2026, EN ISO 10156:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 10156:2017/A1:2026 is associated with the following European legislation: EU Directives/Regulations: 2008/68/EC; Standardization Mandates: M/TDG. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN ISO 10156:2017/A1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10156:2018/oprA1:2026
01-april-2026
Plinske jeklenke - Plini in zmesi plinov - Določanje stopnje vnetljivosti in
oksidativnosti za izbiro izhodnega priključka ventila za jeklenko - Dopolnilo A1
(ISO 10156:2017/DAM 1:2026)
Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing
ability for the selection of cylinder valve outlets - Amendment 1 (ISO 10156:2017/DAM
1:2026)
Gasflaschen - Gase und Gasgemische - Bestimmung der Brennbarkeit und des
Oxidationsvermögens zur Auswahl von Ventilausgängen - Änderung 1 (ISO
10156:2017/DAM 1:2026)
Bouteilles à gaz - Gaz et mélanges de gaz - Détermination du potentiel d'inflammabilité
et d'oxydation pour le choix des raccords de sortie de robinets - Amendement 1 (ISO
10156:2017/DAM 1:2026)
Ta slovenski standard je istoveten z: EN ISO 10156:2017/prA1
ICS:
23.020.35 Plinske jeklenke Gas cylinders
71.100.20 Industrijski plini Gases for industrial
application
SIST EN ISO 10156:2018/oprA1:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN ISO 10156:2018/oprA1:2026
SIST EN ISO 10156:2018/oprA1:2026
DRAFT
Amendment
ISO 10156:2017/
DAM 1
ISO/TC 58/SC 2
Gas cylinders — Gases and gas
Secretariat: AFNOR
mixtures — Determination of fire
potential and oxidizing ability
Voting begins on:
2026-02-24
for the selection of cylinder valve
Voting terminates on:
outlets
2026-05-19
AMENDMENT 1
Bouteilles à gaz — Gaz et mélanges de gaz — Détermination
du potentiel d'inflammabilité et d'oxydation pour le choix des
raccords de sortie de robinets
AMENDEMENT 1
ICS: 23.020.35; 71.100.20
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 is circulated as received from the committee 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 10156:2017/DAM 1:2026(en)
SIST EN ISO 1
...