SIST EN 1797:2002
(Main)Cryogenic vessels - Gas/material compatibility
Cryogenic vessels - Gas/material compatibility
This European Standard specifies requirements for gas/materials compatibility for cryogenic vessels (such as chemical resistance) but it does not cover mechanical properties (e.g. for low temperature application).
It gives guidance for compatibility with gases other than oxygen and it gives detailed requirements for oxygen and oxygen enriched atmosphere compatibility and defines the testing methods for establishing oxygen compatibility of materials (metallic and non-metallic) to be used for cryogenic vessels and associated equipment.
It mainly deals with materials that are normally or could be in contact with liquid/gaseous oxygen e.g., materials for cryogenic vessels used for the storage and/or transport of liquid oxygen.
It also deals with the materials which can be in contact with oxygen enriched environment e.g. insulating materials used for nitrogen, neon, hydrogen and helium cryogenic vessels in case of air condensation.
Kryo-Behälter - Verträglichkeit von Gas/Werkstoffen
Diese Europäische Norm enthält Anforderungen (wie chemische Beständigkeit) an die Verträglichkeit von Werkstoffen mit Gasen für Kryo-Behälter, aber sie umfasst nicht mechanische Eigenschaften (z. B. für die Anwendung bei tiefen Temperaturen).
Sie gibt Hinweise für die Verträglichkeit mit anderen Gasen als Sauerstoff und sie enthält detaillierte Anforderungen an die Sauerstoff-Verträglichkeit und an die Verträglichkeit mit einer sauerstoffangereicherten Atmosphäre und definiert die Prüfverfahren für die Festlegung der Sauerstoff-Verträglichkeit von (metallischen und nicht-metallischen) Werkstoffen, die für Kryo-Behältern und deren Zubehör verwendet werden.
Sie behandelt hauptsächlich Werkstoffe, die üblicher- oder möglicherweise mit flüssigem/gasförmigem Sauerstoff in Berührung kommen, wie z. B. Werkstoffe für Kryo-Behälter zur Lagerung und/oder für den Transport von flüssigem Sauerstoff.
Sie behandelt auch Werkstoffe, die mit einer sauerstoffangereicherten Umgebung in Berührung kommen könnten, wie z. B. Isolierwerkstoffe gegen Luftkondensation für Kryo-Behälter für Stickstoff, Neon, Wasserstoff und Helium.
Récipients cryogéniques - Compatibilité entre gaz et matériaux
La présente Norme européenne spécifie les prescriptions pour la compatibilité entre gaz et matériaux pour les récipients cryogéniques (telle que la résistance chimique). Les propriétés mécaniques (par exemple : pour une application a basse température) sont en dehors du domaine d'application de la présente Norme européenne.
Elle fournit des lignes directrices pour la compatibilité entre matériaux et gaz autre que l'oxygene et spécifie les prescriptions pour la compatibilité entre matériaux et oxygene et atmosphere enrichie en oxygene ; elle définit également les méthodes d'essai pour établir la compatibilité entre oxygene et matériaux (métalliques et non métalliques) destinés a etre utilisés pour les récipients cryogéniques et leurs équipements associés.
Elle traite principalement de matériaux qui sont ou qui pourraient normalement se trouver au contact d'oxygene liquide/gazeux, comme par exemple, les matériaux utilisés pour récipients cryogéniques servant au stockage et/ou au transport d'oxygene liquide.
Elle traite également de matériaux qui sont susceptibles de se trouver au contact d'un environnement enrichi en oxygene, comme par exemple, les matériaux isolants utilisés pour la fabrication de récipients destinés a recevoir de l'azote, du néon, de l'hydrogene et de l'hélium, en cas de condensation d'air.
Kriogene posode - Združljivost plin/material
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Cryogenic vessels - Gas/material compatibilityKriogene posode - Združljivost plin/materialRécipients cryogéniques - Compatibilité entre gaz et matériauxKryo-Behälter - Verträglichkeit von Gas/WerkstoffenTa slovenski standard je istoveten z:EN 1797:2001SIST EN 1797:2002en23.020.40ICS:SIST EN 1797-1:19991DGRPHãþDSLOVENSKI
STANDARDSIST EN 1797:200201-november-2002
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1797July 2001ICS 23.020.40Supersedes EN 1797-1:1998English versionCryogenic vessels - Gas/material compatibilityRécipients cryogéniques - Compatibilité entre gaz etmatériauxKryo-Behälter - Verträglichkeit von Gas/WerkstoffenThis European Standard was approved by CEN on 9 June 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1797:2001 E
EN 1797:2001 (E)2ContentspageForeword.31Scope.42Normative references.43Compatibility of materials with gases other than oxygen.44General requirements for oxygen service.54.1Evaluation of materials for oxygen service.54.2Evaluation of metallic materials.54.3Evaluation of non metallic materials.64.4Test methods and acceptance criteria.64.4.1Ignition tests.64.4.2Mechanical impact test in liquid oxygen (LOX).7Annex A (normative)
Spontaneous ignition test (Bomb test).8Annex B (normative)
Pressure surge test.13Annex C (informative)
Ignition test - Advantages and disadvantages of the two alternative methods.16Annex ZA (informative)
Clauses of this European Standard addressing essential requirements orother provisions of EU directives.17Bibliography.18
EN 1797:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 268, "Cryogenic vessels", thesecretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by January 2002, and conflicting national standards shall be withdrawn at the latestby January 2002.This document replaces EN 1797-1:1998.For relationship with EU Directives, see informative annex ZA, which is an integral part of this document.This document has been prepared under a mandate given to CEN by the European Commission and the EuropeanFree Trade Association, and supports essential requirements of EU Directives.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.
EN 1797:2001 (E)41 ScopeThis European Standard specifies requirements for gas/materials compatibility for cryogenic vessels (such aschemical resistance) but it does not cover mechanical properties (e.g. for low temperature application).It gives guidance for compatibility with gases other than oxygen and it gives detailed requirements for oxygen andoxygen enriched atmosphere compatibility and defines the testing methods for establishing oxygen compatibility ofmaterials (metallic and non-metallic) to be used for cryogenic vessels and associated equipment.It mainly deals with materials that are normally or could be in contact with liquid/gaseous oxygen e.g., materials forcryogenic vessels used for the storage and/or transport of liquid oxygen.It also deals with the materials which can be in contact with oxygen enriched environment e.g. insulating materialsused for nitrogen, neon, hydrogen and helium cryogenic vessels in case of air condensation.2 Normative referencesThis European Standard incorporates by dated or undated references provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publication apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).EN 849: 1996, Transportable gas cylinder – Cylinder valves - Specification and type testing.EN 12300, Cryogenic vessels - Cleanliness for cryogenic service.EN ISO 11114-1, Transportable gas cylinders - Compatibility of cylinder and valve materials with gas contents -Part 1 : Metallic materials (ISO 11114-1:1997).prEN ISO 11114-2:1997, Transportable gas cylinders - Compatibility of cylinder and valve materials with gascontents - Part 2 : Non-metallic materials (ISO/DIS 11114-2).3 Compatibility of materials with gases other than oxygenThe cryogenic vessels are used in a range of temperature from very low temperature to ambient temperature. Theproblems of compatibility with gases other than oxygen such as corrosion, hydrogen embrittlement normally occurat ambient temperature and become negligible at cryogenic temperature.So, in case of gases other than oxygen, EN ISO 11114-1 and prEN ISO 11114-2:1997 may be used as a guide forcryogenic vessels.
EN 1797:2001 (E)54 General requirements for oxygen service4.1 Evaluation of materials for oxygen serviceThe selection of a material for use with oxygen and/or in an oxygen enriched atmosphere is primarily a matter ofunderstanding the circumstances that cause oxygen to react with the material. Most materials in contact withoxygen will not ignite without a source of ignition energy. When an energy input rate, as converted to heat, isgreater than the rate of heat dissipation, and the resulting heat increase is continued for sufficient time, ignition andcombustion will occur. Thus, two things shall be considered the material's minimum ignition temperature ; the energy sources that will produce a sufficient increase in the temperature of the material.These should be viewed in the context of the entire system design so that the specific factors listed below willassume the proper relative significance.The specific factors are : the properties of the materials, including the factors affecting ease of ignition and the conditions affectingpotential resulting damage (heat of reaction) ; the operating conditions : pressure, temperature, gas velocity, oxygen concentrations and oxygen state(gaseous or liquid), surface contamination in accordance with EN 12300 ; the potential sources of ignition (friction, heat of compression, heat from mass impact, heat from particleimpact, static electricity, electrical arc, resonance, internal flexing etc.) ; the reaction effect (consequence on the surroundings etc.) ; additional factors (performance requirements, prior experience, availability and cost).CAUTION This European Standard specifies the minimum acceptance requirements for materials in oxygen and enriched airservice. In the cases of severe conditions and when the operating pressure is above 40 bar, additional tests to those specifiedshould be considered.The use of materials in cryogenic vessels which do not pass the tests outlined in 4.4.1 and/or 4.4.2 shall besupported by a favourable risk assessment and/or documented evidence of previous long term satisfactory servicein use.4.2 Evaluation of metallic materialsMetallic materials normally used for the construction of cryogenic vessels i.e. low alloy steels, nickel steels,stainless steels, copper and copper alloys, aluminium and aluminium alloys do not normally present anyincompatibility when in contact with oxygen.The cases in which some ignitions or violent reactions may occur are when very thin materials are used with highsurface/volume ratio, and when high ignition energy is available e.g. pump failure. Thin materials e.g. thinner than0,1 mm shall be tested in accordance with 4.4.2 in conditions as close as possible to the real operational conditions(e.g. for multi-layer insulations use similar number of layers and configuration). Materials to be used in applicationswhere the ignition energy is potentially high should be subjected to special consideration.For cryogenic vessels intended for oxygen service the test shall be performed with oxygen. For cryogenic vesselsintended for nitrogen, hydrogen or helium service, when materials are located in an area where contact withcondensed enriched air is a risk, the test described in 4.4.2 shall be performed with cryogenic O²/N² mixturescontaining at least 50 % oxygen.
EN 1797:2001 (E)64.3 Evaluation of non metallic materialsNon metallic materials include, for example, plastics, elastomers, lubricants, ceramics, glasses and glues. Some ofthese materials present a high risk of ignition when in contact with oxygen and should be avoided or carefullyselected and used in limited quantity.Some fully oxidised materials such as ceramics and glass present no risk of ignition provided they are notcontaminated.Any non metallic materials, other than fully oxidised materials, in contact with liquid oxygen shall be tested inaccordance with 4.4.1 and 4.4.2. Consideration shall be given to testing materials used in those parts of the systemwhere liquid oxygen accumulation may incidentally occur (e.g. in the insulation).For cryogenic vessels intended for oxygen service the test shall be performed with oxygen. For cryogenic vesselsintended for nitrogen, hydrogen or helium service, when materials are located in an area where contact withcondensed enriched air is a risk, the test described in 4.4.2 shall be performed with cryogenic O²/N² mixturescontaining at least 50 % oxygen.Any non metallic materials, other than fully oxidised materials, in contact with gaseous oxygen shall be tested inaccordance with 4.4.1. Consideration shall be given to testing materials used in those parts of the system wheregaseous oxygen accumulation may incidentally occur (e.g. in the insulation).4.4 Test methods and acceptance criteriaEach material to be tested shall be clearly identified, normally by the commercial nam
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