SIST EN ISO 13758:1998

SLOVENSKI STANDARD
SIST EN ISO 13758:1998
01-maj-1998
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Liquefied petroleum gases - Assessment of the dryness of propane - Valve freeze
method (ISO 13758:1996)
Flüssiggase - Prüfung auf Trockenheit von Propan - Ventileinfrier-Verfahren (ISO
13758:1996)
Gaz de pétrole liquéfiés - Evaluation de la siccité du propane - Méthode de givrage de
vanne (ISO 13758:1996)
Ta slovenski standard je istoveten z: EN ISO 13758:1996
ICS:
75.160.30 Plinska goriva Gaseous fuels
SIST EN ISO 13758:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 13758:1998

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SIST EN ISO 13758:1998

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SIST EN ISO 13758:1998

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SIST EN ISO 13758:1998
INTERNATIONAL IS0
STANDARD 13758
First edition
1996-l 2-l 5
Liquefied petroleum gases - Assessment
of the dryness of propane - Valve freeze
method
Gaz de p&role liqukfiks - &aluation de la siccit6 du propane - M&hode
de givrage de vanne
Reference number
IS0 13758: 1996(E)

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SIST EN ISO 13758:1998
IS0 13758:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 13758 was prepared by Technical Committee
ISOTTC 28, Petroleum products and lubricants.
0 IS0 1996
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 the publisher.
International Organization for Standardization
Case postale 56 l Cl-t-121 1 Geneve 20 l Switzerland
Internet central @ isocs.iso.ch
x.400 c=ch; a=40Onet; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST EN ISO 13758:1998
INTERNATIONAL STANDARD @ IS0 IS0 13758: 1996(E)
Liquefied petroleum gases - Assessment of the dryness of
propane - Valve freeze method
WARNING - The use of this International Standard may involve hazardous materials, operations and
equipment. This standard does not purport to address all of the safety problems associated with its use. It
is the responsibility of the user of this standard to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to use.
1 Scope
This International Standard describes a procedure for the assessment of whether liquefied petroleum gas (LPG)
hydrocarbons consisting predominantly of propane and/or propene are sufficiently dry to avoid malfunctions in
pressure-reducing systems installed in domestic, industrial and automotive LPG applications.
The test is normally used as a functional pass/fail test in which the behaviour of the product is assessed in a
specially designed and calibrated regulator valve.
NOTES
1 If excessive dissolved water is contained in the LPG under test, it will cause freezing and blockage of a test regulator valve,
which is an indication that the product could cause malfunctions in commercial pressure-reducing systems.
2 If the product under test contains an antifreeze agent, the time taken for the test valve to freeze is not necessarily a function
of dryness, but may provide an indication of the tendency of the product to cause freezing in pressure-reducing regulators
under service conditions.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the edition indicated was valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IS0 425711988, Liquefied petroleum gases - Method of sampling.
3 Definition
For the purposes of this I nternational Standard! the following definition applies:
3.1 valve freeze time; freeze-off time: Time, in seconds, from the start of the test until the test product ceases to
flow through a standard t est valve under specified conditions.

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SIST EN ISO 13758:1998
ISO13758:1996(E) @ IS0
4 Principle
A liquid-phase aliquot of the sample to be tested is allowed to flow through the wide-
...