prEN ISO 28622

SLOVENSKI STANDARD
oSIST prEN ISO 28622:2008
01-april-2008
9DUQRVWQLYHQWLOL]DSUHPLþQHSRQRYQRSROQOMLYHMHNOHQNH]DXWHNRþLQMHQLQDIWQLSOLQ
813,62',6
Pressure relief valves for transportable refillable cylinders for liquefied petroleum gas
(LPG) (ISO/DIS 28622:2008)
Gasflaschen - Druckentlastungsventile für ortsbewegliche, wiederbefüllbare Flaschen für
Flüssiggas (LPG) (ISO/DIS 28622:2008)
Soupapes de sécurité pour les bouteilles transportables et rechargeables pour gaz de
pétrole liquéfiés (GPL) (ISO/DIS 28622:2008)
Ta slovenski standard je istoveten z: prEN ISO 28622
ICS:
23.020.30
23.060.40
oSIST prEN ISO 28622:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
DRAFT
prEN ISO 28622
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2008
ICS 23.060.40; 23.020.30 Will supersede EN 13953:2003
English Version
Pressure relief valves for transportable refillable cylinders for
liquefied petroleum gas (LPG) (ISO/DIS 28622:2008)
Soupapes de sécurité pour les bouteilles transportables et
rechargeables pour gaz de pétrole liquéfiés (GPL) (ISO/DIS
28622:2008)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 286.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 28622:2008: E
worldwide for CEN national Members.

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prEN ISO 28622:2008 (E)
Contents Page
Foreword.3

2

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prEN ISO 28622:2008 (E)
Foreword
This document (prEN ISO 28622:2008) has been prepared by Technical Committee ISO/TC 58 "Gas
cylinders" in collaboration with Technical Committee CEN/TC 286 “Liquefied petroleum gas equipment and
accessories” the secretariat of which is held by NSAI.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN 13953:2003.
Endorsement notice
The text of ISO/DIS 28622:2008 has been approved by CEN as a prEN ISO 28622:2008 without any
modification.

3

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DRAFT INTERNATIONAL STANDARD ISO/DIS 28622
ISO/TC 58/SC 2 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2008-01-24 2008-06-24
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Pressure relief valves for transportable refillable cylinders for
liquefied petroleum gas (LPG)
Soupapes de sécurité pour les bouteilles transportables et rechargeables pour gaz de pétrole liquéfiés (GPL)
ICS 23.020.30; 23.060.40

ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2008

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ISO/DIS 28622
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Violators may be prosecuted.
©
ii ISO 2008 – All rights reserved

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ISO/DIS 28622
Contents Page
Foreword .iv
1 Scope.1
2 Terms and definitions .1
3 Symbols and abbreviated terms .2
4 Operating temperatures.2
5 Materials.3
5.1 General .3
5.2 Metallic materials.3
5.3 Non-metallic components.3
5.4 Lubricants, sealants and adhesives.4
6 Design.4
6.1 General .4
6.2 Threads.5
6.3 Springs .5
6.4 Test requirements .5
7 Testing and inspection of the design.5
7.1 General .5
7.2 Hydraulic proof test.6
7.3 Start to discharge pressure test .6
7.4 Discharge capacity test .7
7.5 Leak Tightness Test.7
7.6 Leak tightness at high temperature.7
7.7 Leak tightness at low temperature .8
7.8 Test records .8
8 Production testing.8
9 Marking.8
10 Documentation .9
Annex A (informative) Terms used with pressure relief valves .10
Annex B (normative) Special low temperature requirements for valves .11
Annex C (informative) Sizing of pressure relief valves for LPG cylinders.12
Annex D (informative) Production testing.13
D.1 General.13
D.2 Dimensional inspection .13
D.3 Setting and leak testing of pressure relief valves.13
Bibliography.14

© ISO 2007 – All rights reserved iii

DRAFT 2008

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ISO/DIS 28622
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 28622 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings.
iv © ISO 2007 – All rights reserved

DRAFT 2008

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DRAFT INTERNATIONAL STANDARD ISO/DIS 28622

Pressure relief valves for transportable refillable cylinders for
liquefied petroleum gas (LPG)
1 Scope
This standard specifies the design, testing and marking requirements for spring loaded pressure relief valves,
for use in liquefied petroleum gas (LPG) cylinders.
These valves can be either an integral part of a cylinder valve (see ISO 14245 and ISO 15995) or a separate
device.
This standard does not exclude the use of other designs of pressure relief devices that provide a similar level
of safety.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
LPG (liquefied petroleum gas)
mixture of predominantly butane or propane with traces of other hydrocarbon gases classified in accordance
with UN number 1965, hydrocarbon gases mixture, liquefied, NOS or UN number 1075, petroleum gases,
liquefied
NOTE In some countries, UN number 1011, 1978 may also be designated LPG.
2.2
pressure relief valve
valve which automatically opens without the assistance of any energy other than that of the internal fluid
pressure. The loading due to the fluid pressure underneath the valve-sealing element is opposed by a spring.
The valve when open will discharge a quantity of fluid so as to prevent a rise of internal fluid pressure in
excess of a specified value due to emergency or abnormal conditions, and re-closes and prevent the further
flow of fluid after normal pressure conditions of service have been restored
2.3
pressure/flow terms
NOTE 1 Terms used with LPG pressure relief valves are described graphically in Annex A.
NOTE 2 All pressures are gauge pressures unless otherwise specified.
2.3.1
nominal set pressure
predetermined pressure at which the pressure relief valve is set to start to discharge
2.3.2
start to discharge pressure
inlet pressure at which the first of a stream of bubbles appears at the outlet of a pressure relief valve through a
water seal of not more than 50 mm water column, or other equivalent method
© ISO 2007 – All rights reserved 1

DRAFT 2008

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ISO/DIS 28622
2.3.3
pop action
rapid opening of the valve sealing element to achieve full lift, resulting from an increase of inlet pressure
creating a sudden increase in force and compression of the spring
2.3.4
overpressure
pressure range between the nominal set pressure and the flow rating pressure
2.3.5
re-seat pressure
inlet pressure at which the sealing element effects a seal with the valve seat after the valve has been
subjected to pop action
2.3.6
flow rating pressure
inlet pressure at which the discharge capacity is measured
2.4
nominal discharge capacity
minimum discharge capacity at the flow rating pressure expressed in cubic metres per minute of free air at
STP rounded down to one decimal place
2.5
discharge capacity
capacity at the flow rating pressure of a pressure relief valve expressed in cubic metres per minute of free air
at STP
2.6
sealing element
non-metallic resilient component which effects the seal by contact with the pressure relief valve seat
2.7
valve seat
normally raised area of the pressure relief valve body on to which the sealing element effects a seal
2.8
cylinder valve
valve fitted to transportable refillable LPG cylinders from 0,5 l up to 150 l water capacity intended to convey
LPG only
2.9
leak tightness
resistance to leakage to atmosphere across the valve seat or any other pressure containing component when
the valve is closed
3 Symbols and abbreviated terms
STP Standard Temperature and Pressure [15,6 °C (288,7 K), 1,013 bar absolute (0,1013 MPa absolute)]
4 Operating temperatures
Valves designed in accordance with this standard shall be suitable for:
 a minimum operating temperature of - 20 °C in service. Temperatures below this are acceptable for short
periods for example, when filling;
2 © ISO 2007 – All rights reserved

DRAFT 2008

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ISO/DIS 28622
 a minimum operating temperature of - 40 °C for those parts of the world where valves are subject to
more severe temperature conditions. The material and design shall be shown to be satisfactory for
operations under these conditions and shall meet the requirements of Annex B;
 a maximum operating temperature of 65 °C. Temperatures above this are acceptable for short periods.
5 Materials
5.1 General
5.1.1 Materials in contact with LPG shall be physically and chemically compatible with LPG under all
normal operating conditions for which the valve is intended, see ISO 11114-1 and ISO 11114-2.
5.1.2 Materials for valve components shall be selected to give adequate strength in service. Consideration
shall be given to all modes
...