SIST EN ISO 11114-1:2012
(Main)Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1: Metallic materials (ISO 11114-1:2012)
Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1: Metallic materials (ISO 11114-1:2012)
This standard provides requirements for the selection and evaluation of compatibility between metallic gas cylinder and valve materials, and the gas content. The compatibility data given is related to single component gases and to gas mixtures. Seamless and welded gas cylinders used to contain compressed, liquefied and dissolved gases, are considered.
Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in Berührung kommenden Gasen - Teil 1: Metallische Werkstoffe (ISO 11114-1:2012)
Diese Norm enthält Anforderungen für die Auswahl und die Beurteilung der Verträglichkeit zwischen metallischen Gasflaschen- und Ventilwerkstoffen und den in Berührung kommenden Gasen.
Die Angaben zur Verträglichkeit beziehen sich auf Einzelgase und Gasgemische.
Es sind nahtlose und geschweißte Gasflaschen, die verdichtete, verflüssigte und gelöste Gase enthalten, berücksichtigt.
ANMERKUNG In dieser Norm wird der Begriff "Flasche" für ortsbewegliche Druckgefäße, welche auch Großflaschen und Druckfässer umfassen, verwendet.
Weitere Aspekte, wie die Qualität des gelieferten Produktes, werden nicht behandelt.
Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les contenus gazeux - Partie 1: Matériaux métalliques (ISO 11114-1:2012)
L'ISO 11114-1:2012 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.
L'ISO 11114-1:2012 prend en considération les bouteilles à gaz composites, métalliques soudées, métalliques sans soudure et leurs robinets utilisées pour contenir des gaz comprimés, liquéfiés et dissous.
Elle 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 11114-1:2012)
Ta standard določa zahteve za izbiro in oceno združljivosti materialov za kovinske plinske jeklenke in ventile s plinom. Navedeni podatki o združljivosti se nanašajo na enokomponentne pline in mešanice plinov. Obravnavane so brezšivne in varjene plinske jeklenke, ki se uporabljajo za stisnjene, utekočinjene in raztopljene pline.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11114-1:2012
01-maj-2012
1DGRPHãþD
SIST EN ISO 11114-1:1999
SIST EN ISO 11114-1:1999/AC:1999
Plinske jeklenke - Združljivost materialov za ventil in jeklenko s plinom - 1. del:
Kovinski materiali (ISO 11114-1:2012)
Gas cylinders - Compatibility of cylinder and valve materials with gas contents - Part 1:
Metallic materials (ISO 11114-1:2012)
Gasflaschen - Verträglichkeit von Werkstoffen für Gasflaschen und Ventile mit den in
Berührung kommenden Gasen - Teil 1: Metallische Werkstoffe (ISO 11114-1:2012)
Bouteilles à gaz - Compatibilité des matériaux des bouteilles et des robinets avec les
contenus gazeux - Partie 1: Matériaux métalliques (ISO 11114-1:2012)
Ta slovenski standard je istoveten z: EN ISO 11114-1:2012
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
SIST EN ISO 11114-1:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 11114-1:2012
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SIST EN ISO 11114-1:2012
EUROPEAN STANDARD
EN ISO 11114-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2012
ICS 23.020.30 Supersedes EN ISO 11114-1:1997
English Version
Gas cylinders - Compatibility of cylinder and valve materials with
gas contents - Part 1: Metallic materials (ISO 11114-1:2012)
Bouteilles à gaz - Compatibilité des matériaux des Gasflaschen - Verträglichkeit von Werkstoffen für
bouteilles et des robinets avec les contenus gazeux - Partie Gasflaschen und Ventile mit den in Berührung kommenden
1: Matériaux métalliques (ISO 11114-1:2012) Gasen - Teil 1: Metallische Werkstoffe (ISO 11114-1:2012)
This European Standard was approved by CEN on 18 February 2012.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11114-1:2012: E
worldwide for CEN national Members.
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SIST EN ISO 11114-1:2012
EN ISO 11114-1:2012 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 11114-1:2012
EN ISO 11114-1:2012 (E)
Foreword
This document (EN ISO 11114-1:2012) 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 September 2012, and conflicting national standards shall be
withdrawn at the latest by September 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11114-1:1997.
This European Standard has been submitted for reference into the RID and/or the technical annexes of the
ADR.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11114-1:2012 has been approved by CEN as a EN ISO 11114-1:2012 without any
modification.
3
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SIST EN ISO 11114-1:2012
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SIST EN ISO 11114-1:2012
INTERNATIONAL ISO
STANDARD 11114-1
Second edition
2012-03-15
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 11114-1:2012(E)
©
ISO 2012
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Materials . 2
4.1 General . 2
4.2 Cylinder materials . 3
4.3 Valve materials . 3
5 Compatibility criteria . 3
5.1 General . 3
5.2 Corrosion . 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 (see Table 1) . 5
6.2 Compatibility for gas mixtures . 5
6.3 Using Table 1 . 6
Annex A (informative) Gas/materials NQSAB compatibility code . 33
Bibliography . 47
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 11114-1 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 23, Transportable gas cylinders, in collaboration with ISO Technical Committee ISO/TC 58, Gas
cylinders, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This second edition cancels and replaces the first edition (ISO 11114-1:1997), which has been technically
revised. The main changes resulting from the revision of this part of ISO 11114 are
the term “not recommended” has been replaced by “not acceptable”,
the text has been clarified,
a requirement for gas mixtures has been introduced.
ISO 11114 consists of the following parts, under the general title Gas cylinders — Compatibility of cylinder and
valve materials with gas contents:
Part 1: Metallic materials
Part 2: Non-metallic materials
Part 3: Autogenous ignition test for non-metallic materials in oxygen atmosphere
Part 4: Test methods for selecting metallic materials resistant to hydrogen embrittlement
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(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 part of ISO 11114 is based on current international experience and knowledge.
Where there is any conflict between this International Standard and any applicable regulation, the regulation
always takes precedence.
This part of ISO 11114 has been written to be in conformity with the UN Recommendations on the Transport
of Dangerous Goods: Model Regulations. When published it will be submitted to the UN Sub Committee of
Experts on the Transport of Dangerous Goods with a request that it be included in the Model Regulations.
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SIST EN ISO 11114-1:2012
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SIST EN ISO 11114-1:2012
INTERNATIONAL STANDARD ISO 11114-1:2012(E)
Gas cylinders — Compatibility of cylinder and valve materials
with gas contents —
Part 1:
Metallic materials
1 Scope
This part of ISO 11114 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 part of ISO 11114 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 referenced documents are indispensable for the application 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 9809-1, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa
ISO 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of
cylinder valve outlets
ISO 10297, Transportable 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
ISO 11120, Gas cylinders — Refillable seamless steel tubes for compressed gas transport of water capacity
between 150 l and 3 000 l — Design, construction and testing
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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
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 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 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 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.
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 part of
ISO 11114.
Other materials whose compatibility is not identified in this part of ISO 11114 may be used if all compatibility
aspects have been considered and validated by a competent person.
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
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 International Standards:
aluminium, ISO 7866 and ISO 11118;
steel, ISO 4706, ISO 9328-5, ISO 9809-1, ISO 9809-2, ISO 9809-3, ISO 9809-4, ISO 11118 and
ISO 11120;
aluminium alloys and stainless steel, ISO 6361-2 and ISO 15510.
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, 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 part of ISO 11114 to stainless steels by their commonly used AISI identification
numbers, e.g. 304. For information, 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
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;
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
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.
5.2 Corrosion
Many types of corrosion mechanisms can occur due to the presence of the gas, as outlined in 5.2.1 to 5.2.3.
5.2.1 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.
5.2.2 Corrosion in wet conditions
This corrosion 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
2
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
2
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:
a) 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
b) 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.
5.2.3 Corrosion by impurities
Gases which themselves are inert (non-corrosive) can cause corrosion due to the presence of impurities.
Pollution 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 5.2.2) and oxygen (e.g. in
liquefied ammonia);
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
b) aggressive products contained in some gases, e.g. H S in natural gas;
2
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.
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 % copper and of
2 2
CH Cl in aluminium alloy cylinders.
3
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 (see Table 1)
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 Table A.3, 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. Some International Standards, such as ISO 11114-4,
specify test methods for selecting appropriate steels with a maximum UTS (ultimate tensile strength) greater
than 950 MPa.
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SIST EN ISO 11114-1:2012
ISO 11114-1:2012(E)
NOTE In a gas mixture, the partial pressure for hydrogen sulphide and methyl mercaptan is reduced to 0,25 MPa
(2,5 bar) at a maximum UTS of 950 MPa.
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 Compressed gas, flammable, NOS, UN 1954.
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
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ISO 11114-1:2012(E)
© ISO 2012 – All rights reserved 7
Table 1 — Gas/material compatibility
Material
Cylinder Valve (body and
No. Gas number Name Formula Key compatibility characteristics
components)
UN number
A N A N
Ability to form explosive acetylides with certain
1 (UN 1001) ACETYLENE C H NS B B
2 2
metals, including copper and copper alloys. Use
(Cu
(UN 3374)
<65 % Cu and copper alloy. This also applies to
>65 %)
mixtures 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
(2 %)
case exceeding 50 %.
SS SS
Ni Ni
2 (UN 1005) AMMONIA Risk of stress corrosion cracking with brass (and NS CS
NH
3
other copper alloys) valves due to atmospheric
QTS SS
contaminant. This applies to all gases and
AA AA B
mixtures containing even traces of NH .
3
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
4 (UN 2188) ARSINE AsH Because of risk of hydrogen embrittlement: NS B
3
— QTS are limited to a maximum ultimate
QTS CS
tensile strength of 950 MPa;
AA SS
— SS may be used for valve diaphragms and
SS AA
springs when there is operating experience
Ni
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.
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ISO 11114-1:2012(E)
8 © ISO 2012 – All rights reserved
Table 1 (continued)
Material
Cylinder Valve (body and
No. Gas number Name Formula Key compatibility characteristics
components)
UN number
A N A N
5 (UN 1741) BORON Hydrolyses to hydrogen chloride in contact with NS AA CS AA
BCl
3
moisture. In wet conditions, see specific risk of
TRICHLORIDE QTS SS B
hydrogen chloride compatibility, i.e. severe
SS Ni
corrosion of most of the materials and risk of
Ni
hydrogen embrittlement.
Mixtures of dry gas not exceeding 0,1 % of this
gas may
...
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