EN ISO 4256:1998

SLOVENSKI STANDARD
SIST EN ISO 4256:1999
01-november-1999
1DGRPHãþD
SIST EN ISO 4256:1998
8WHNRþLQMHQLQDIWQLSOLQL'RORþHYDQMHSDUQHJDWODND0HWRGD813,62
Liquefied petroleum gases - Determination of gauge pressure - LPG method (ISO
4256:1996)
Flüssiggase - Bestimmung des Dampfdruckes - LPG-Verfahren (ISO 4256:1978)
Gaz de pétrole liquéfiés - Détermination de la pression de vapeur - Méthode GPL (ISO
4256:1978)
Ta slovenski standard je istoveten z: EN ISO 4256:1998
ICS:
75.160.30 Plinska goriva Gaseous fuels
SIST EN ISO 4256:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 4256:1999

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SIST EN ISO 4256:1999

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SIST EN ISO 4256:1999

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SIST EN ISO 4256:1999

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SIST EN ISO 4256:1999

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SIST EN ISO 4256:1999
INTERNATIONAL
STANDARD
Second edition
1996-I O-l 5
Liquefied petroleum gases -
Determination of gauge vapour pressure -
LPG method
DBtermination de la pression de vapeur
Gaz de p&role liqu@fi& -
Mkthode GPL
relative -
Reference number
IS0 4256: 1996(E)

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SIST EN ISO 4256:1999
IS0 4256: 1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide fed-
eration of national standards bodies IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
body interested in a subject for
technical committees. Each membe
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 4256 was prepared by Technical Committee
lSO/lC 28, Petroleum products and lubricants.
This second edition cancels and replaces the first edition (IS0 4256:1978),
which has been technically revised.
Annexes A and B form an integral part of this International Standard.
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 CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 4256:1999
INTERNATIONAL STANDARD @ IS0 IS0 4256: 1996(E)
Liquefied petroleum gases - Determination of gauge
vapour pressure - LPG 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 International Standard to establish appropriate safety and health
practices and determine the applicability of regulatory limitations prior to use.
of IEC and IS0 maintain registers of currently valid In-
1 Scope
ternational Standards.
This International Standard describes a method for the
IS0 3007: 1986, Petroleum products - Determination
determination of gauge vapour pressures of liquefied
of vapour pressure - Reid method.
petroleum gas products (see clause 3) at temper-
atures within the approximate range of 35 “C to 70 “C.
IS0 4257:1988, Liquefied petroleum gases - Method
of sampling.
NOTES
I Information on the vapour pressure of liquefied petro-
leum gases is required for the selection of properly de-
signed storage vessels, shipping containers and customer
3 Definitions
utilization equipment, to ensure the safe handling of these
products, and to ensure that maximum operating design
For the purposes of this International Standard, the
pressures are not exceeded under the foreseen ambient
following definitions apply.
operating conditions.
2 The vapour pressure of liquefied petroleum gases is an
3.1 vapour pressure: Pressure exerted by the va-
indirect measure of the lowest temperature at which initial
pour of a liquid when in equilibrium with the liquid.
vaporization can be expected to occur. It may also be con-
sidered to be an indirect indication of the most volatile con-
stituent p
...