SIST EN ISO 15996:2005
(Main)Gas cylinders - Residual pressure valves - General requirements and type testing (ISO 15996:2005)
Gas cylinders - Residual pressure valves - General requirements and type testing (ISO 15996:2005)
This standard specifies requirements for residual pressure valves (RPV's), with or without a non-return function, for gas cylinders and the methods of testing such valves, for type approval. This standard is applicable to valves to be fitted to gas cylinders up to 150 l water capacity, intended to contain compressed, liquefied or dissolved gases. This standard does not cover valves for fire extinguishers, cryogenic equipment or liquefied petroluem gas. These requirements are in addition to those laid down in ISO 10297.
Gasflaschen - Restdruckventile - Allgemeine Anforderungen und Typprüfung (ISO 15996:2005)
Diese Internationale Norm enthält Anforderungen an Restdruckventile, mit oder ohne Rückschlagfunktion, für Gasflaschen und Prüfverfahren zur Prüfung dieser Ventile für die Typzulassung.
Diese Internationale Norm gilt für Ventile an Gasflaschen mit einem Fassungsraum bis zu 150 Liter, die für verdichtete, verflüssigte und beständige Gase vorgesehen sind.
Diese Internationale Norm gilt nicht für Ventile an Feuerlöschern, für die Ausrüstung im Kryo-Bereich und für Flüssiggas.
Diese Anforderungen gelten zusätzlich zu den in ISO 10297 festgelegten Angaben.
Bouteilles a gaz - Robinets a pression résiduelle - Exigences générales et essais de type (ISO 15996:2005)
L'ISO 15996:2005 spécifie les exigences applicables aux robinets à pression résiduelle montés sur les bouteilles à gaz, avec ou sans dispositif antiretour, ainsi que les méthodes d'essai de ces robinets en vue de l'approbation de type.
L'ISO 15996:2005 est applicable aux robinets à monter sur les bouteilles à gaz de capacité en eau ne dépassant pas 150 l, destinées à contenir des gaz comprimés, liquéfiés ou dissous.
L'ISO 15996:2005 ne traite pas des robinets pour extincteurs d'incendie, équipements cryogéniques ou gaz de pétrole liquéfié.
Plinske jeklenke - Ventili z ostankom tlaka - Splošne zahteve in preskus tipa (ISO 15996:2005)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 15996:2005
01-julij-2005
Plinske jeklenke - Ventili z ostankom tlaka - Splošne zahteve in preskus tipa (ISO
15996:2005)
Gas cylinders - Residual pressure valves - General requirements and type testing (ISO
15996:2005)
Gasflaschen - Restdruckventile - Allgemeine Anforderungen und Typprüfung (ISO
15996:2005)
Bouteilles a gaz - Robinets a pression résiduelle - Exigences générales et essais de type
(ISO 15996:2005)
Ta slovenski standard je istoveten z: EN ISO 15996:2005
ICS:
23.020.35 Plinske jeklenke Gas cylinders
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
SIST EN ISO 15996:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 15996:2005
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SIST EN ISO 15996:2005
EUROPEAN STANDARD
EN ISO 15996
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2005
ICS 23.020.30
English version
Gas cylinders - Residual pressure valves - General
requirements and type testing (ISO 15996:2005)
Bouteilles à gaz - Robinets à pression résiduelle - Gasflaschen - Restdruckventile - Allgemeine
Exigences générales et essais de type (ISO 15996:2005) Anforderungen und Typprüfung (ISO 15996:2005)
This European Standard was approved by CEN on 21 March 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15996:2005: E
worldwide for CEN national Members.
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SIST EN ISO 15996:2005
EN ISO 15996:2005 (E)
Foreword
This document (EN ISO 15996:2005) 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 October 2005, and conflicting national
standards shall be withdrawn at the latest by October 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 15996:2005 has been approved by CEN as EN ISO 15996:2005 without any
modifications.
2
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SIST EN ISO 15996:2005
INTERNATIONAL ISO
STANDARD 15996
First edition
2005-04-01
Gas cylinders — Residual pressure
valves — General requirements and type
testing
Bouteilles à gaz — Robinets à pression résiduelle — Exigences
générales et essais de type
Reference number
ISO 15996:2005(E)
©
ISO 2005
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
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ii © ISO 2005 – All rights reserved
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 Valve requirements. 2
4.1 General. 2
4.2 Description. 2
4.3 Valve outlet geometry. 2
4.4 Performance requirements of the residual pressure device. 3
4.4.1 Leakage tightness. 3
4.4.2 Endurance. 3
4.4.3 Resistance against reverse over pressure. 3
4.4.4 Resistance to ignition. 3
5 Type testing. 3
5.1 General. 3
5.2 Documents. 4
5.3 Test valves. 4
5.4 Residual pressure device performance tests . 5
5.4.1 General. 5
5.4.2 Leak tightness tests. 5
5.4.3 Cycle life test . 5
5.4.4 Resistance test against reverse over-pressure . 5
5.4.5 Oxygen pressure surge test. 5
5.5 Test report. 6
Annex A (informative) Various examples of residual pressure valve designs . 7
Annex B (informative) Test equipment. 10
B.1 Tightness test equipment for residual pressure valve . 10
B.2 Cycle life test equipment for residual pressure valve. 11
Annex C (informative) Conveyance test. 12
Annex D (informative) Integrity under high flow . 13
Bibliography . 15
© ISO 2005 – All rights reserved iii
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SIST EN ISO 15996:2005
ISO 15996:2005(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 15996 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings.
iv © ISO 2005 – All rights reserved
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
Introduction
Gas cylinders are fitted with valves, to contain and control the discharge of their contents.
Increased requirements about avoidance of contamination of gases and gas cylinders has led to the
development of gas cylinder valves incorporating residual pressure devices.
These devices are designed to maintain a small positive differential pressure between the inlet and the outlet
of the cylinder valve. This prevents the gas cylinder from being completely empty in customer use and stops
ingress of atmospheric contamination.
Many of these devices include a non-return function that protects the cylinder from back flow from
downstream processes.
© ISO 2005 – All rights reserved v
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SIST EN ISO 15996:2005
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SIST EN ISO 15996:2005
INTERNATIONAL STANDARD ISO 15996:2005(E)
Gas cylinders — Residual pressure valves — General
requirements and type testing
1 Scope
This International Standard specifies requirements for residual pressure valves, with or without a non-return
function, for gas cylinders and the methods of testing such valves, for type approval.
This International Standard is applicable to valves to be fitted to gas cylinders of up to 150 l water capacity,
intended to contain compressed, liquefied or dissolved gases.
This International Standard does not cover valves for fire extinguishers, cryogenic equipment or liquefied
petroleum gas.
These requirements are in addition to those laid down in ISO 10297.
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 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of
cylinder valve outlets
ISO 10297:1999, Gas cylinders — Refillable gas cylinder valves — Specification and type testing.
3 Terms and definitions
For the purposes of this document the following terms and definitions apply.
3.1
working pressure
p
w
settled pressure, at a uniform temperature of 15 °C, for a full gas cylinder
3.2
valve test pressure
p
vt
for compressed gases p = 1,2 × p and for liquefied gases and dissolved gases under pressure
vt w
(e.g. acetylene), p is greater or equal to the minimum test pressure of the cylinder quoted in the relevant
vt
transportation regulation for that gas or gas group and filling ratio
3.3
flow direction
path taken through the valve by the gas when flowing out of the cylinder through the outlet
© ISO 2005 – All rights reserved 1
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SIST EN ISO 15996:2005
ISO 15996:2005(E)
3.4
filling direction
path taken through the valve by the gas when filling from the outlet into the gas cylinder
3.5
opening pressure
differential pressure between upstream and downstream pressures at which the residual pressure device
starts to open
NOTE Due to the effects of manufacturing tolerances this is normally expressed as a range of pressures.
3.6
closing off pressure
differential pressure between upstream and downstream pressures at which the residual pressure device
closes
NOTE Due to the effects of manufacturing tolerances this is normally expressed as a range of pressures.
4 Valve requirements
4.1 General
Valves shall operate satisfactorily over the full range of service temperatures, normally from − 20 °C to + 65 °C.
The range may be exceeded for short periods (e.g. during filling). Where higher or lower service temperatures
are required for longer periods, the purchaser shall specify them accordingly.
Valves shall be capable of withstanding the mechanical stresses or chemical attack they may experience
during normal service e.g. during storage, valving into cylinders, filling processes, transportation and end use
of the cylinder.
Valves shall be cleaned to meet the requirements of the intended service. However, valves to be tested shall
be in a condition that the manufacturer intends to supply, prior to any test or test preparation.
4.2 Description
There are currently two main types of residual pressure valves (see Figures A.1 and A.2). The valve shown in
Figure A.1 leaves a small positive or residual pressure in the cylinder. The valve shown in Figure A.2 not on
...
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