EN ISO 4257:2001

SLOVENSKI STANDARD
01-december-2001
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SIST EN ISO 4257:1998
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Liquefied petroleum gases - Method of sampling (ISO 4257:2001)
Flüssiggase-Probenahme (ISO 4257:2001)
Gaz de pétrole liquéfiés - Méthode d'échantillonnage (ISO 4257:2001)
Ta slovenski standard je istoveten z: EN ISO 4257:2001
ICS:
75.160.30 Plinska goriva Gaseous fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 4257
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2001
ICS 75.160.30 Supersedes EN ISO 4257:1995
English version
Liquefied petroleum gases - Method of sampling (ISO
4257:2001)
Gaz de pétrole liquéfiés - Méthode d'échantillonnage (ISO
4257:2001)
This European Standard was approved by CEN on 29 June 2001.
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 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 translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4257:2001 E
worldwide for CEN national Members.

Foreword
The text of the International Standard ISO 4257:2001 has been prepared by Technical
Committee ISO/TC 28 "Petroleum products and lubricants" in collaboration with Technical
Committee CEN/TC 19 "Petroleum products, lubricants and related products", the secretariat
of which is held by NEN.
This European Standard supersedes EN ISO 4257:1995.
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 January 2002, and conflicting national
standards shall be withdrawn at the latest by January 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries 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.
NOTE FROM CMC: The foreword is susceptible to be amended on reception of the German
language version. The confirmed or amended foreword, and when appropriate, the normative
annex ZA for the references to international publications with their relevant European
publications will be circulated with the German version.
Endorsement notice
The text of the International Standard ISO 4257:2001 was approved by CEN as a European
Standard without any modification.
INTERNATIONAL ISO
STANDARD 4257
Second edition
2001-07-15
Liquefied petroleum gases — Method of
sampling
Gaz de pétrole liquéfiés — Méthode d'échantillonnage
Reference number
ISO 4257:2001(E)
©
ISO 2001
ISO 4257:2001(E)
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ii © ISO 2001 – All rights reserved

ISO 4257:2001(E)
Contents Page
Foreword.iv
1 Scope .1
2 Term and definition .1
3 Principle.1
4 General considerations for obtaining a representative sample .1
5 Safety precautions.2
6 Apparatus .3
7 Preparing the sample container.4
8 Procedure .4
Bibliography.7
ISO 4257:2001(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 4257 was prepared by Technical Committee ISO/TC 28, Petroleum products and
lubricants, Subcommittee SC 3, Static petroleum measurement.
This second edition cancels and replaces the first edition (ISO 4257:1988), of which it constitutes a technical
revision.
iv © ISO 2001 – All rights reserved

INTERNATIONAL STANDARD ISO 4257:2001(E)
Liquefied petroleum gases — Method of sampling
WARNING — The use of this International Standard may involve hazardous materials, operations and
equipment. This International 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, health and
environment protection practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This International Standard specifies the procedure to be used for obtaining samples of unrefrigerated liquefied
petroleum gases (LPG). It is suitable for sampling from bulk containers, to provide samples for laboratory testing of
products covered by ISO 9162.
This International Standard is applicable for the provision of samples for compositional analysis by ISO 7941. It is
not applicable for the provision of samples for trace analysis of low-boiling components. If trace analysis of low-
boiling components is required, a variable-volume receiver such as that described in ASTM D 3700 should be
used.
2 Term and definition
For the purposes of this International Standard, the following term and definition applies.
2.1
liquefied petroleum gases
LPG
petroleum gases that can be stored and/or handled in the liquid phase under moderate conditions of pressure and
at ambient temperature
NOTE These gases consist predominantly of propane, propene, butanes and butenes, with small proportions of ethane,
ethene and/or pentanes and pentenes. They are normally described in terms of the predominant hydrocarbon, e.g. commercial
butane or commercial propane.
3Principle
A liquid sample is transferred from the source into a sample container through a transfer line by purging the
container and filling it with liquid, then providing a liquid ullage so that 80 % (V/V) of the container volume
...