SIST EN ISO 11114-1:2020
(Main)Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1: Metallic materials (ISO 11114-1:2020)
Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1: Metallic materials (ISO 11114-1:2020)
This document provides requirements for the selection of safe combinations of metallic cylinder and valve materials and cylinder gas content.
The compatibility data given is related to single gases and to gas mixtures.
Seamless metallic, welded metallic and composite gas cylinders and their valves, used to contain compressed, liquefied and dissolved gases are considered.
NOTE In this document the term "cylinder" refers to transportable pressure receptacles, which also include tubes and pressure drums.
Aspects such as the quality of delivered gas product are not considered.
Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in Berührung kommenden Gasen - Teil 1: Metallische Werkstoffe (ISO 11114-1:2020)
Dieses Dokument enthält Anforderungen für die Auswahl von sicheren Kombinationen von metallischen Gasflaschen- und Ventilwerkstoffen und den in Berührung kommenden Gasen.
Die Angaben zur Verträglichkeit beziehen sich auf Einzelgase und Gasgemische.
Es sind nahtlose metallische Gasflaschen, geschweißte metallische Gasflaschen und Gasflaschen aus Verbundwerkstoffen (Composite-Gasflaschen) einschließlich ihrer Ventile zur Verwendung mit verdichteten, verflüssigten und gelösten Gasen berücksichtigt.
ANMERKUNG In diesem Dokument wird der Begriff „Flasche“ für ortsbewegliche Druckgefäße, welche auch Großflaschen und Druckfässer umfassen, verwendet.
Aspekte wie die Qualität des gelieferten Gasproduktes werden nicht berücksichtigt.
Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les contenus gazeux - Partie 1: Matériaux métalliques (ISO 11114-1:2020)
Le présent document fournit les exigences pour le choix des combinaisons de matériaux sûres pour les bouteilles à gaz métalliques et leur robinet et les gaz contenus dans la bouteille.
Les données de compatibilité indiquées se rapportent aux gaz à l'état pur et aux mélanges de gaz.
Le présent document prend en considération les bouteilles à gaz métalliques sans soudure, soudées et composites, et leurs robinets utilisés pour contenir des gaz comprimés, liquéfiés et dissous.
NOTE Dans le présent document, le terme «bouteille» se réfère aux récipients à pression transportables qui incluent aussi les tubes et les fûts à pression.
Il ne traite pas d'autres aspects tels que la qualité du produit gazeux fourni.
Plinske jeklenke - Združljivost materialov za ventil in jeklenko s plinom - 1. del: Kovinski materiali (ISO 11114-1:2020)
Ta dokument določa zahteve za izbiro varnih kombinacij materialov za kovinske jeklenke in ventile ter jeklenke s plinom.
Navedeni podatki o združljivosti se navezujejo na enokomponentne pline in mešanice plinov.
Obravnavane so kovinske, varjene kovinske in plinske jeklenke iz kompozitnih materialov brez spojev in njihovi ventili, ki se uporabljajo za stisnjene, utekočinjene in raztopljene pline.
OPOMBA: V tem dokumentu se izraz »jeklenka« navezuje na prenosne tlačne posode, ki vključujejo tudi cevi in tlačne valje.
Vidiki, kot je kakovost dobavljenega plina, niso obravnavani.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST EN ISO 11114-1:2012
SIST EN ISO 11114-1:2012/A1:2017
Plinske jeklenke - Združljivost materialov za ventil in jeklenko s plinom - 1. del:
Kovinski materiali (ISO 11114-1:2020)
Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1:
Metallic materials (ISO 11114-1:2020)
Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in
Berührung kommenden Gasen - Teil 1: Metallische Werkstoffe (ISO 11114-1:2020)
Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les
contenus gazeux - Partie 1: Matériaux métalliques (ISO 11114-1:2020)
Ta slovenski standard je istoveten z: EN ISO 11114-1:2020
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 Tlačni regulatorji Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 11114-1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 23.020.35 Supersedes EN ISO 11114-1:2012
English Version
Gas cylinders - Compatibility of cylinder and valve
materials with gas contents - Part 1: Metallic materials
(ISO 11114-1:2020)
Bouteilles à gaz - Compatibilité des matériaux des Gasflaschen - Verträglichkeit von Werkstoffen für
bouteilles et des robinets avec les contenus gazeux - Gasflaschen und Ventile mit den in Berührung
Partie 1: Matériaux métalliques (ISO 11114-1:2020) kommenden Gasen - Teil 1: Metallische Werkstoffe
(ISO 11114-1:2020)
This European Standard was approved by CEN on 11 May 2020.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11114-1:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 11114-1:2020) has been prepared by Technical Committee ISO/TC 58 "Gas
cylinders" in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the
secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2020, and conflicting national standards
shall be withdrawn at the latest by December 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11114-1:2012.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11114-1:2020 has been approved by CEN as EN ISO 11114-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 11114-1
Third edition
2020-05
Gas cylinders — Compatibility of
cylinder and valve materials with gas
contents —
Part 1:
Metallic materials
Bouteilles à gaz — Compatibilité des matériaux des bouteilles et des
robinets avec les contenus gazeux —
Partie 1: Matériaux métalliques
Reference number
ISO 11114-1:2020(E)
©
ISO 2020
ISO 11114-1:2020(E)
© ISO 2020
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
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
ISO 11114-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials . 2
4.1 General . 2
4.2 Cylinder materials . 2
4.3 Valve materials . 3
4.3.1 General. 3
4.3.2 Particular considerations . 3
5 Compatibility criteria . 3
5.1 General . 3
5.2 Corrosion . 4
5.2.1 General. 4
5.2.2 Corrosion in dry conditions . 4
5.2.3 Corrosion in wet conditions . 4
5.2.4 Corrosion by impurities . 4
5.3 Hydrogen embrittlement phenomenon . 5
5.4 Generation of dangerous products . 5
5.5 Violent reactions (e.g. ignition) . 5
5.6 Stress corrosion cracking . 5
6 Material compatibility . 5
6.1 Table of compatibility for single gases . 5
6.2 Compatibility for gas mixtures . 5
6.3 Using Table 1 . 6
6.3.1 Conventions and numbers . 6
6.3.2 Abbreviations for materials. 6
Annex A (informative) Gas/materials NQSAB compatibility code .37
Bibliography .48
ISO 11114-1:2020(E)
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 58, Gas cylinders, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 23, Transportable gas
cylinders, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This third edition cancels and replaces the second edition (ISO 11114-1:2012), which has been
technically revised. It also incorporates the Amendment ISO 11114-1:2012/Amd.1:2017. The main
changes compared to the previous edition are as follows:
— inclusion of all changes in ISO 11114-1:2012/Amd.1:2017;
— clarification of the definition of dry;
— addition of notes in Table 1.
A list of all parts in the ISO 11114 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
ISO 11114-1:2020(E)
Introduction
Industrial, medical and special gases (e.g. high-purity gases, calibration gases) can be transported or
stored in gas cylinders. An essential requirement of the material from which such gas cylinders and
their valves are manufactured is compatibility with the gas content.
Compatibility of cylinder materials with gas content has been established over many years by practical
application and experience. Existing national and international regulations and standards do not fully
cover this aspect.
This document is based on current international experience and knowledge.
[1]
This document has been written so that it is suitable to be referenced in the UN Model Regulations .
INTERNATIONAL STANDARD ISO 11114-1:2020(E)
Gas cylinders — Compatibility of cylinder and valve
materials with gas contents —
Part 1:
Metallic materials
1 Scope
This document provides requirements for the selection of safe combinations of metallic cylinder and
valve materials and cylinder gas content.
The compatibility data given is related to single gases and to gas mixtures.
Seamless metallic, welded metallic and composite gas cylinders and their valves, used to contain
compressed, liquefied and dissolved gases are considered.
NOTE In this document the term “cylinder” refers to transportable pressure receptacles, which also include
tubes and pressure drums.
Aspects such as the quality of delivered gas product are not considered.
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 10156, Gas cylinders — Gases and gas mixtures — Determination of fire potential and oxidizing ability
for the selection of cylinder valve outlets
ISO 10286, Gas cylinders — Terminology
ISO 10297, Gas cylinders — Cylinder valves — Specification and type testing
ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials
ISO 11114-3, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 3:
Autogenous ignition test for non-metallic materials in oxygen atmosphere
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10286 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 http:// www .electropedia .org/
3.1
competent person
person who has the necessary technical knowledge, experience and authority to assess and approve
materials for use with gases and to define any special conditions of use that are necessary
ISO 11114-1:2020(E)
3.2
acceptable
A
material/gas combination that is safe under normal conditions of use, provided that any indicated
non-compatibility risks are taken into account
Note 1 to entry: Low levels of impurities can affect the acceptability of some single gases or gas mixtures.
3.3
not acceptable
N
material/single gas combination that is not safe under all normal conditions of use
Note 1 to entry: For gas mixtures special conditions may apply (see 6.2 and Table 1).
3.4
dry
state in which there is no free water in a cylinder under any service conditions, including at the highest
expected operating pressure and at the lowest expected operating temperature
Note 1 to entry: For compressed gases at, for example, 200 bar and −20 °C, the maximum moisture content is
not to exceed 5 ppmV, to avoid condensation of free water. For other temperatures and pressures, the maximum
moisture content needed to avoid condensation of water will be different. Another source of moisture to be
considered is the cylinder itself which implies appropriate drying procedures such as purging and vacuuming.
3.5
wet
state in which the conditions as defined for dry (3.4) are not met
3.6
gas mixture
combination of different single gases deliberately mixed in specified proportions
3.7
single gas
gas which does not contain deliberately added content of another gas or gases
4 Materials
4.1 General
The compatibility of most materials used to manufacture gas cylinders and valves is identified in this
document.
Other materials whose compatibility is not identified in this document may be used if all compatibility
aspects have been considered and validated by a competent person.
4.2 Cylinder materials
The most commonly used metallic materials for cylinders are (among others) carbon manganese steel,
chromium molybdenum steel, chromium molybdenum nickel steel, stainless steel and aluminium
alloys, as specified in the following documents:
— aluminium and aluminium alloys: ISO 6361-2, ISO 7866 and ISO 11118;
— steel: ISO 4706, ISO 9328-5, ISO 9809-1, ISO 9809-2, ISO 9809-3, ISO 11118 and ISO 11120;
— stainless steel: ISO 9809-4 and ISO 15510.
2 © ISO 2020 – All rights reserved
ISO 11114-1:2020(E)
4.3 Valve materials
4.3.1 General
The most commonly used metallic materials for valve bodies and internal gas wetted parts are brass
and other similar copper-based alloys, carbon steel, stainless steel, refined nickel and nickel alloys, Cu–
Be (2 %) and aluminium alloys.
4.3.2 Particular considerations
4.3.2.1 In special cases, non-compatible materials may be used for non-oxidizing gases if suitably
plated, protected or coated. This may only be done if all compatibility aspects have been considered and
validated by a competent person for the entire life of the valve.
4.3.2.2 Special precautions, in accordance with ISO 11114-3 (which addresses testing, not precautions
per se), shall be taken for oxidizing gases as specified in ISO 10156. In this case, non-compatible materials
are not acceptable (see 3.3) for use in valves, even if plated, protected or coated.
4.3.2.3 For cylinder valves, compatibility in wet conditions shall be considered because of the high risk
of contamination by atmospheric moisture and an airborne contaminant.
NOTE Reference is made in this document to stainless steels by their commonly used AISI identification
numbers, i.e. 304. For example, the equivalent grades according to EN 10088-1 are as follows:
304 1.4301
304L 1.4306 and 1.4307
316 1.4401
316L 1.4404
316Ti 1.4571
321 1.4541
904L 1.4539
5 Compatibility criteria
5.1 General
Compatibility between a gas and the cylinder/valve material is affected by chemical reactions and
physical influences, which can be classified into five categories:
— corrosion;
— stress corrosion cracking;
— hydrogen embrittlement;
— generation of dangerous products through chemical reaction;
— violent reactions, such as ignition.
Non-metallic components (valve sealing, gland packing, O-ring, etc.) shall be in accordance
with ISO 11114-2.
Sealing or lubricating materials (when used) at the valve stem shall be compatible with the gas content.
NOTE Annex A gives the gas/materials NQSAB compatibility codes, for information.
ISO 11114-1:2020(E)
5.2 Corrosion
5.2.1 General
Many types of corrosion mechanisms can occur due to the presence of the gas, as outlined in 5.2.2 to 5.2.4.
5.2.2 Corrosion in dry conditions
This corrosion is affected by chemical attack by a dry gas on the cylinder material. The result is a
reduction of the cylinder wall thickness. This type of corrosion is not very common, because the rate of
dry corrosion is very low at ambient temperature.
5.2.3 Corrosion in wet conditions
This is the most common type of corrosion, which only occurs in a gas cylinder due to the presence of
free water or aqueous solutions. However, with some hygroscopic gases (e.g. HCl, Cl ) corrosion would
occur even if the water content were less than the saturation value. Therefore, some gas/material
combinations are not recommended, even if inert in the theoretical dry conditions. It is thus very
important to prevent any water ingress into gas cylinders. The most common sources of or reasons for
water ingress are:
a) the customer, by retro-diffusion/backfilling or when the cylinder is empty, by air entry, if the valve
is not closed,
b) ineffective drying following hydraulic testing, and
c) during filling.
In some cases, it is very difficult to completely prevent water ingress – particularly when the gas is
hygroscopic (e.g. HCl, Cl ). In cases where the filler cannot guarantee the dryness of gas and cylinder, a
cylinder material which is compatible with the wet gas shall be used, even if the dry gas is not corrosive.
There are several different types of “wet corrosion” in alloys:
1) general corrosion leading to the reduction of the wall thickness, e.g. by acid gases (CO , SO ) or
2 2
oxidizing gases (O , Cl );
2 2
2) localized corrosion, e.g. pitting corrosion or grain boundary attack.
Additionally, some gases, even inert ones, when hydrolysed could lead to the production of corrosive
products.
5.2.4 Corrosion by impurities
Gases which themselves are inert (non-corrosive) can cause corrosion due to the presence of impurities.
Contamination of gases can occur, during filling, during use or if the initial product is not properly
purified.
The most common pollutants are:
a) atmospheric air, in which case the harmful impurities can be moisture (see also 5.2.3) and oxygen
(e.g. in liquefied ammonia);
b) aggressive products contained in some gases, e.g. H S in natural gas;
c) aggressive traces (acid, mercury, etc.) remaining from the manufacturing process of some gases.
The materials compatible with the impurities shall be used if the presence of these impurities cannot be
prevented and if the corresponding corrosion rate is unacceptable for the intended application.
4 © ISO 2020 – All rights reserved
ISO 11114-1:2020(E)
5.3 Hydrogen embrittlement phenomenon
Embrittlement caused by hydrogen can occur at ambient temperature in the case of certain gases and
under service conditions which stress the cylinder or valve material.
This type of stress cracking phenomenon can, under certain conditions, lead to the failure of gas
cylinders and/or valve components containing hydrogen, mixtures of hydrogen and other gases.
5.4 Generation of dangerous products
In some cases, reactions of a gas with a metallic material can lead to the generation of dangerous
products. Examples are the possible reactions of C H with copper alloys containing more than 65 %
2 2
copper and of CH Cl in aluminium alloy cylinders.
5.5 Violent reactions (e.g. ignition)
In principle, violent reactions of gas/metallic material are not very common at ambient temperatures,
because high activation energies are necessary to initiate such reactions. In the case where a
combination of non-metallic and metallic materials is used, e.g. for valves, this type of reaction can
occur with some gases (e.g. O , Cl ).
2 2
5.6 Stress corrosion cracking
Stress corrosion cracking can occur in many metallic materials subjected to stress, moisture and
a contaminant at the same time. Stress corrosion cracking can, under certain conditions, lead to the
failure of the gas cylinder or valve and/or its components (e.g. ammonia in contact with copper alloy
valves or carbon monoxide/carbon dioxide mixtures in steel cylinders).
6 Material compatibility
6.1 Table of compatibility for single gases
Before any gas/cylinder/valve combination is chosen a careful study of all the key compatibility
characteristics given in Table 1 shall be made. Particular attention shall be paid to any restrictions,
which shall be applied to acceptable materials.
NOTE The gases are generally listed in the table in English alphabetical order.
6.2 Compatibility for gas mixtures
Any gas mixtures containing single gases that are all compatible with a given material shall be
considered as being compatible with this material.
For gas mixtures containing gases causing embrittlement (see 5.3, and Clause A.4, groups 2 and 11) the risk
of hydrogen embrittlement only occurs if the partial pressure of the gas is greater than 5 MPa (50 bar) and
the stress level of the cylinder material is high enough. In a gas mixture, the partial pressure for hydrogen
sulphide and methyl mercaptan shall be less than 0,25 MPa (2,5 bar) at a maximum UTS (ultimate tensile
strength) of 950 MPa. If the stress level of the cylinder material is high, see Table 1, row 63.
Some International Standards, such as ISO 11114-4, specify test methods for selecting appropriate
steels with a maximum UTS greater than 950 MPa.
For the halogenated gases that are not compatible with aluminium alloy cylinders, the maximum
acceptable concentration in gas mixtures shall be limited to 0,1 % as indicated in Table 1 unless higher
concentrations have been validated after conducting specific tests (examples of such tests are given
[14]
in EIGA document 161/16 ). The moisture content (dryness) in these mixtures shall be limited to a
maximum of 10 ppmV.
ISO 11114-1:2020(E)
For non-compatibility of some halogenated gases with aluminium alloys, the maximum acceptable
content is given in Table 1. The level of moisture can affect the acceptability of such mixtures.
6.3 Using Table 1
6.3.1 Conventions and numbers
In Table 1, bold face type indicates that the material is commonly used under normal service conditions:
— A = acceptable (see 3.2);
— N = not acceptable (see 3.3).
If there is no UN number listed for a gas (or liquid), the gas has no official UN number but may be shipped
using a generic NOS (not otherwise specified) number.
EXAMPLE UN 1954, Compressed gas, flammable, N.O.S.
6.3.2 Abbreviations for materials
CS carbon steels used for the manufacture of cylinder valve bodies
NS carbon steels heat treated by normalization that are used for the manufacture of seamless and
welded cylinders
QTS alloy steels that are treated by quenching and tempering and that are used for the manufacture
of seamless steel cylinders
SS austenitic type stainless steels used for the manufacture of seamless and welded cylinders and
some valve bodies and valve components
AA aluminium alloys specified in ISO 7866 when used for the manufacture of seamless cylinders;
for aluminium valve bodies, alloys not specified in ISO 7866 may also be used
B brass and other copper alloys used for the manufacture of cylinder valves
Ni nickel alloys used for the manufacture of cylinders, valves and valve components
Cu copper
ASB aluminium silicon bronze
6 © ISO 2020 – All rights reserved
ISO 11114-1:2020(E)
Table 1 — Gas/material compatibility
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
1 (UN 1001) ACETYLENE C H Ability to form explosive acetylides with certain NS B B
2 2
metals, including copper and copper alloys. Use (Cu
(UN 3374)
<65 % Cu and copper alloy. This also applies to mix- >65 %)
tures of more than 1 % C H .
2 2
QTS CS
The acceptable limit of the silver content of alloys
AA AA Cu-Be
should preferably be 43 % (by mass) but in no case
(2 %)
exceeding 50 %.
SS SS
There is no known incompatibility between the sol-
Ni Ni
vents used and any metallic materials, this is more
relevant for ISO 11114-2.
2 (UN 1005) AMMONIA NH Risk of stress corrosion cracking with brass (and NS CS
other copper alloys) valves due to atmospheric
QTS SS
contaminant. This applies to all gases and mixtures
AA AA B
containing even traces of NH .
SS Ni
Ni
3 (UN 1006) ARGON Ar No reaction with any common materials in dry or NS B
wet conditions.
QTS CS
AA SS
SS AA
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
8 © ISO 2020 – All rights reserved
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
4 (UN 2188) ARSINE AsH Because of risk of hydrogen embrittlement: NS B
QTS CS
— QTS are limited to a maximum ultimate tensile
AA SS
strength of 950 MPa;
SS AA
— SS may be used for valve diaphragms and
Ni
springs when there is operating experience
that shows the design is suitable and safe.
Alternatively, use is also authorized if failure of
the SS springs or SS diaphragms does not result
in an unsafe condition.
NOTE Some SS alloys can be sensitive to hydrogen
embrittlement.
See special conditions for mixtures given in 6.2.
5 (UN 1741) BORON TRICHLORIDE BCl Hydrolyses to hydrogen chloride in contact with NS AA CS AA
moisture. In wet conditions, see specific risk of
QTS SS B
hydrogen chloride compatibility, i.e. severe corro-
SS Ni
sion of most of the materials and risk of hydrogen
embrittlement.
Ni
Mixtures of dry gas not exceeding 0,1 % of this gas
may be filled into AA cylinders.
6 (UN 1008) BORON TRIFLUORIDE BF Hydrolyses to hydrogen fluoride in contact with NS AA CS AA
moisture. In wet conditions, see specific risk of
QTS SS B
hydrogen fluoride compatibility, i.e. severe corro-
SS Ni
sion of most of the materials and risk of hydrogen
embrittlement.
Ni
Mixtures containing less than 0,1 % BF may be
filled into AA cylinders.
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
7 (UN 1974) BROMOCHLORODIFLUORO- CBrClF No reaction with any common materials when dry NS B
METHANE but in the presence of free water, corrosion can occur.
QTS CS
(R12B1)
AA SS
SS AA
8 (UN 1009) BROMOTRIFLUOROMETHANE CBrF No reaction with any common materials when dry NS B
but in the presence of free water, corrosion can occur.
QTS CS
(R13B1)
AA SS
SS AA
9 (UN 2419) BROMOTRIFLUOROETHYLENE C BrF No reaction with any common materials when dry NS B
2 3
but in the presence of free water, corrosion can occur.
QTS CS
AA SS
SS AA
10 (UN 1010) BUTADIENE-1,3 H C : C HC H: C H No reaction with any common materials. See 5.2.4 NS B
2 2
for the effect of impurities in wet conditions.
QTS CS
AA SS
SS AA
11 (UN 1010) BUTADIENE-1,2 H C : C : C HC H No reaction with any common materials. See 5.2.4 NS B
2 3
for the effect of impurities in wet conditions.
QTS CS
AA SS
SS AA
12 (UN 1011) BUTANE C H No reaction with any common materials. See 5.2.4 NS B
4 10
for the effect of impurities in wet conditions.
QTS CS
AA SS
SS AA
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
10 © ISO 2020 – All rights reserved
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
13 (UN 1012) BUTENE-1 CH CH C H: C H No reaction with any common materials. See 5.2.4 NS B
3 2 2
for the effect of impurities in wet conditions.
QTS CS
AA SS
SS AA
14 (UN 1012) BUTENE-2 CH C H: C HC H No reaction with any common materials. See 5.2.4 NS B
3 3
(CIS) for the effect of impurities in wet conditions.
QTS CS
AA SS
SS AA
15 (UN 1012) BUTENE-2 CH C H: C HC H No reaction with any common materials. See 5.2.4 NS B
3 3
(TRANS) for the effect of impurities in wet conditions.
QTS CS
AA SS
SS AA
16 (UN 1013) CARBON DIOXIDE CO No reaction with any common materials when dry. NS B
Forms acidic carbonic in the presence of free water;
QTS CS
corrosive for NS, QTS and CS.
AA SS
Risk (for NS and QTS) of stress corrosion cracking
SS AA
in presence of CO (see carbon monoxide) and water.
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
17 (UN 1016) CARBON MONOXIDE CO Risk of formation of toxic metal carbonyls. NS B
QTS CS
Highly sensitive to any traces of moisture [>5 ppmV
at 20 MPa (200 bar)], in the presence of CO
2 AA SS
(>5 ppmV). Industrial grades of carbon monoxide
SS AA
normally contain traces of CO . This can result in
risk of stress corrosion cracking, in the case of QTS,
CS and NS cylinders if used at the normal service
stress levels. Experience shows that this risk is
eliminated if the fill pressure at 15 °C is less than
50 % of the cylinder working pressure. For details,
see EIGA/CGA reference in the Bibliography.
For QTS, CS, and NS steels this risk of stress cor-
rosion cracking shall be considered for mixtures
containing down to 0,1 % CO.
Refined nickel gaskets used for some applications
are not compatible with CO.
NOTE AA and SS are not affected by this stress
corrosion cracking phenomenon.
Nickel alloys also suffer from a high propensity to
form carbonyls. Alloys with less than 50% Nickel,
1 [16]
such as the Incoloy© may be acceptable .
18 (UN 1982) TETRAFLUORMETHANE CF (R14) No reaction with any common materials when dry NS B
(CARBON TETRAFLUORIDE) but in the presence of free water, corrosion can occur.
QTS CS
AA SS
SS AA
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
12 © ISO 2020 – All rights reserved
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
19 (UN 2204) CARBONYL SULPHIDE COS Risk of formation of toxic metal carbonyls at tem- NS B
perature >100 °C.
QTS CS
Highly sensitive to any traces of moisture
AA SS
(>5 ppmV), in the presence of CO (>5 ppmV);
SS AA
industrial grades of carbonyl sulphide normally
contain traces of CO . This results in a risk of stress
corrosion cracking, in the case of QTS, NS and CS.
See also CO (No.17).
20 (UN 1017) CHLORINE Cl Hydrolyses to hypochlorous acid and to hydrogen NS AA CS AA
chloride in contact with moisture. In wet condi-
a
QTS B
tions, see specific risk of hydrogen chloride compat-
SS SS
ibility, i.e. severe corrosion of most of the materials
and risk of hydrogen embrittlement.
Ni
The service life of brass valves strongly depends on ASB
the operating service conditions.
Mixtures containing less than 0,1 % of this gas may
be filled into AA cylinders.
21 (UN 1018) CHLORODIFLUOROMETHANE CHClF No reaction with any common materials when dry, NS B
but in the presence of free water corrosion occurs.
QTS CS
(R22)
AA SS
SS AA
ASB
22 (UN 1063) METHYL CHLORIDE CH Cl In the presence of free water, corrosion can occur. NS AA B AA
(R40) Mixtures of dry gas containing not more than 0,1 % QTS CS
of this gas may be filled into AA cylinders.
SS SS
No reaction with any common materials when dry,
Ni Ni
but in the presence of free water corrosion occurs.
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
23 (UN 1020) CHLOROPENTAFLUOROETHANE C ClF No reaction with any common materials when dry, NS B
2 5
but in the presence of free water corrosion occurs.
QTS CS
(R115)
AA SS
SS AA
24 (UN 1021) CHLOROTETRAFLUOROETHANE CClF CHF No reaction with any common materials when dry, NS B
2 2
but in the presence of free water corrosion occurs.
QTS CS
(R124)
AA SS
SS AA
25 (UN 1983) CHLOROTRIFLUOROETHANE CH ClCF No reaction with any common materials when dry, NS B
2 3
but in the presence of free water corrosion occurs.
QTS CS
(R133a)
AA SS
SS AA
26 (UN 1082) CHLOROTRIFLUOROETHYLENE C ClF No reaction with any common materials when dry, NS B
2 3
but in the presence of free water corrosion occurs.
QTS CS
(R1113)
AA SS
SS AA
27 (UN 1022) CHLOROTRIFLUOROMETHANE CClF No reaction with any common materials when dry, NS B
but in the presence of free water corrosion occurs.
QTS CS
(R13)
AA SS
SS AA
28 (UN 1027) CYCLOPROPANE C H No reaction with any common materials. NS B
3 6
QTS CS
AA SS
SS AA
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
14 © ISO 2020 – All rights reserved
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
29 (UN 1957) DEUTERIUM D Because of risk of hydrogen embrittlement: QTS B
NS CS
— QTS are limited to a maximum ultimate tensile
AA AA
strength of 950 MPa;
SS SS
— SS may be used for valve diaphragms and
springs when there is operating experience
that shows the design is suitable and safe.
Alternatively, use is also authorized if failure of
the SS springs or SS diaphragms does not result
in an unsafe condition.
NOTE Some SS alloys can be sensitive to hydrogen
embrittlement.
See special conditions for mixtures given in 6.2.
Refined nickel is not acceptable for bursting disks
and other components.
Risk of embrittlement due to the presence of mer-
cury from certain production processes has to be
considered, especially with AA.
30 (UN 1941) DIBROMODIFLUOROMETHANE CBr F No reaction with any common materials when dry, QTS B
2 2
but in the presence of free water corrosion occurs.
NS CS
(R12B2)
AA AA
SS SS
31 (See 6.3.1) DIBROMOTETRAFLUORO- C Br F No reaction with any common materials when dry, QTS B
2 2 4
ETHANE but in the presence of free water corrosion occurs.
NS CS
AA AA
SS SS
a
Brass is only acceptable as a valve body but not as a general valve component material.
b
For mixtures containing up to 1 000 ppm of dry NO, brass valves can be used.
ISO 11114-1:2020(E)
Table 1 (continued)
No. Gas number Name Formula Key compatibility characteristics Material
UN number
Cylinder Valve (body and
components)
A N A N
32 (UN 1911) DIBORANE B H Because of risk of hydrogen embrittlement: QTS B
2 6
NS SS
— QTS are limited to a maximum ultimate tensile
AA CS
strength of 950 MPa;
SS Ni
— SS may be used for valve diaphragms and
springs when there is operating experience
that shows the design is suitable and safe.
Alternatively, use is also authorized if failure of
the SS springs or SS diaphragms does not result
in an unsafe condition.
NOTE Some SS alloys can be sensitive to hydrogen
embrittlement.
See special conditions for mixtures given in 6.2.
33 (UN 1028) DICHLORODIFLUOROMETHANE CCl F No reaction with any common materials when dry, QTS B
2 2
but in the presence of free water corrosion occurs.
NS CS
(R12)
AA AA
SS SS
34 (UN 1029) DICHLOROFLUOROMETHANE CHCl F No reaction with any common materials when dry, QTS B
but in the presence of free water corrosion occurs.
NS CS
(R21)
AA AA
SS SS
35 (UN 2189) DICHLOROSILANE SiH Cl Hydrolyses to hydrogen chloride in contact with QTS AA SS AA
2 2
moisture. In wet conditions, see specific risk of hy-
NS CS B
drogen chloride compatibility, i.e. severe corrosion of
SS Ni
most materials and risk of hydrogen embrittlement.
Ni
Mixtures of dry gas not exceeding 0,1 % of this gas
may be filled into AA cylinders.
a
Brass is only acceptable
...
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