ISO/R 91:1970
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UDC 665.6 : 53.08 (083.5) Ref. NO. : ISO/R 91 -1970 (E)
IS0
I N T E RN AT I O N A L
O ROAN I 2 AT I ON FOR STAND AR D It AT I O N
IS0 RECOMMENDATION
O
R 91
This second edition supersedes the first edition
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 91, Petroleum meusurement rubles, was drawn up by Technical Committee ISO/TC 28,
Perroleurn products, the Secretariat of which is held by the American National Standards Institute (ANSI).
Work on this question led to the adoption of Draft IS0 Recommendation No. 103, which was circulated to all IS0 Member
Bodies for enquiry in November 1957. It was approved by 22 Member Bodies. Four Member Bodies opposed the approval of the
Draft (Czechoslovakia, France, Romania, U.S.S. R.).
O
This Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided, in February 1959,
to accept it as an IS0 RECOMMENDATION.
BRIEF HISTORY RELATING TO THE 2nd EDITION
A few amendments to IS0 Recommendation R 91 having become necessary, a second edition of that
IS0 Recommendation was prepared by Technical Committee ISO/TC 28, and a Draft IS0 Recommendation
(No. 1384) adopted to this effect.
These amendments being of minor importance, the Draft IS0 Recommendation, after having been approved
(P) Members of ISO/TC 28, was submitted direct to the IS0 Council, in accordance with Clause F.7.1 of
by the
the Directives for the technical work of ISO.
O -
The IS0 Council then decided, in February 1970, to accept this Draft IS0 Recommendation as a second
edition of IS0 Recommendation R 91 -1959.
This edition (2nd edition) cancels and replaces the first edition of IS0 Recommendation R 91 -1959.
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-3- ISO/R 91 -1970(E)
IS0 Recommendation R 91 February 1970
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PETROLEUM MEASUREMENT TABLES
The International Organization for Standardization (ISO) recommends the use, for international trade, of the
ASTM-IP Petroleum Measurement Tables
which were developed jointly by
the American Society for Testing and Materials (ASTM) - U.S.A., and
(U)
the Institute of Petroleum (IP) - United Kingdom,
(b)
and which have been published
in the U.S.A., under the references
(U)
ASTM D 1250-56
USAS Z11.83-1956
in the United Kingdom, under the references
(b)
IP 200/52
BSI Handbook No. 15 (British Edition)
BSI Handbook No. 16 (Metric Edition)
(The publications referred to above are reprinted from time to time incorporating any corrections required in the
tables. Users of the tables should ensure that they have the most recent reprint).
NOTES
1. For the convenience of the user, the tables are available in three companion volumes called :
(U) the American Edition*,
(b) the British Edition*,
(c) the Metric Edition*.
2. The American Edition contains petroleum measurement tables used in U.S.A. oil measurement practice. The
oil measurement practice. The Metric
British Edition contains petroleum measurement tables used in British
Edition contains petroleum measurement tables in metric units.
3. Each edition contains tables which permit accurate conversion of measurements from one system to another;
hence there are some tables that are common to the three editions. A complete list of the tables to which this
IS0 Recommendation relates is given in the Annex.
4. The abridged tables 7,25 and 55 are intended for use when less precision is required than that afforded by
tables 6, 24 and 54 respectively. They should only be used in international trade with the explicit agreement of
the contracting parties.
The three editions may be purchased from the publishers, the American Society for Testing and Materials, 1916 Race Street,
Philadelphia, Pa. 19103, U.S.A., or from the Institute of Petroleum, 61, New Cavendish Street, London W1 M 8 AR, England,
and from any national standards organization.
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-4- ISO/R 91 -1970 (E)
5. It will be noticed that the names used in the titles, appearing in the Annex, and in the tables to designate quantities
IS0 to designate these quantities and units.
and units differ in certain cases from the names adopted by
The Table below gives the correspondence between the names used in the ASTM-IP Petroleum Measurement
Tables and those adopted by IS0 in the following IS0 Recommendations :
ISO/R 3 1, Part I, Basic quantities and units of the SI and quantities and units of space and time (2nd edition,
December 1965);
ISO/R 31, Part III, Quantities and units of mechanics (1st edition, December 1960).
References
Names used in the
Names, abbreviations and symbols
ASTM-IP Petroleum
lation R 31
adopted by IS0 IS0 Recommi
Measurement Tables*
Item No.
Part
Specific Gravity relative density (of the liquid in relation
III 3-3.1
to water) (d)
3-2.1
Density density (mass density) (p) III
I 1 -5.k
U.S. Gallon gallon (US), gal (US)
Barrel barrel (US) I 1 -5.0
1 -5.b
Liter, litre litre (1) I
Pound pound (avoirdupois) (lb) III 3-1.h
III 3-1.0
Short Ton sh
...
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