BS 6441:1993 download.Schedule for Petroleum measurement tables.
Introduction
The tables referred to in ISOIR 9 1:1970 were developed during the late 1940’s and were based on data for crude petroleum and petroleum fractions published in 1916. Some later data on natural gasolines reported in 1942 were also used. The revised tables referred to in ISO 91-1:1982 were prepared by the American Petroleum Institute following the development of a new data base by the National Bureau of Standards (USA). This study included the examination of 463 samples of crude oil and refined products. The samples represented 67 % of world crude petroleum production and 68 % of the estimated reserves in 1974. The present revision takes account of subsequent publications.
1 Scope
This part of ISO 91 refers to petroleum measurement tables based on reference temperatures of 15 °C and 60 °F.
The standard reference temperature for petroleum measurement adopted in ISO 5024 [4] is 15 °C, and should be used for international trade. However, it is recognized that its use is not yet universally accepted and references to tables based on 60 °F have therefore been included in this part of ISO 91 and tables based on 20 °C are covered in
ISO 91-2[1].
2 Normative references
The tables that form the basis of this part of ISO 91 contain printing errors which are identified in other documents listed below. These subsidiary documents constitute, through reference in the text, an integral part of this part of ISO 91.
API Standard 2540, Manual of petroleum measurement standards, Chapter 11.1 — Volume correct ion factors.
Volumes I to X, 1980;
Volumes XIII and XIV, 1982.’
API Document, Editorial amplification of volume X — Background, development, and computer docu men tation, American Petroleum Institute, Washington DC, 1980.
API Document, Errata sheet to Table 23B and
Table 53B, American Petroleum Institute,
Washington DC. 1981.
APT Document, The use of the petroleum
measurement tables — APi STD. 2540 (CH. 11.1),
ASTM D 1250 and IP 200(1980), American
Petroleum Institute, Washington DC. 1984
(revised June 1987).
ASTM D 1250. Petroleum measurement tables:
Volumes I to X. 1980;1)
Volume XI/XII, l982.
ASTM-IP.API, Petroleum measurement tables for light hydrocarbon liquids, density range 0.500 to 0.653 kg/litre at 15 °C, published for the Institute of Petroleum by John Wiley and Sons, 1986.2)
IP Petroleum Measurement Paper No. 2, Guidelines
for users of the petroleum measurement tables
(APi STD. 2540; IP 200, ANSJ/ASTM D 1250), the
Institute of Petroleum, London, 1984.
3 Sources of tables
3.1 For the purpose of custody transfer in
accordance with this part of Iso 91, reference shall
be made to the API-ASTM-IP Pet roleunz
measurement tables, which were developed jointly
by
a) the American Petroleum Institute
(API) — USA,
b) the American Society for Testing and Materials (ASTM) — USA, and
c) the Institute of Petroleum (IP) — United Kingdom, and have been adopted by these organizations under the following designations:
API STD. 2540:1980
ANSIJASTM D 1250-80
IP 200/80
See also 3.6.
3.2 The tables have been published by the American Petroleum Institute under the title Manual of petroleum measurement standards, chapter 11.1 — Volume correction factors, and by the American Society for Testing and Materials. which published two of the volumes, Volumes XIIXIL as a combined document. The complete set of tables consists of 14 volumes, and the table numbers and titles are related to the volume numbers given in Annex A to this part of ISO 91. Such publications are reprinted from time to time. If corrections are included in such reprints, the API has agreed to advise ISO of them, and an amendment will be issued to this part of ISO 91 referring to the corrections and to the date of the reprint. Users should then ensure that they have the most recent reprint.
No amendments or reprints have been published since the previous edition of this part of ISO 91, but corrections are listed in the following publications and the corrected values shall be used in connection with this part of ISO 91:
a) Editorial amplification of volume X — Background, development, and computer documentation;
b) Errata sheet to Table 23B and Table 53B,
c) The use of the petroleum measurement tables — API STD. 2540 (CII. 11.1), ASTM D 1250 and IP 200 (1980,);
d) Guidelines for users of the petroleum measurement tables (API STD. 2540; IP 200; ANSI/ASTM D 1250).
NOTE I Copies of items a). b) and c) are usually supplied with the appropriate volumes of the tables; they are also reproduced witain item d). with other corrections.
3.3 Of the tables referred to in Annex A, the three series of tables
5A, SB. 5D, 6A, 6B. 6C. 6D
23A, 23B, 24A, 24B. 24C
53A, 53B, 53D, 54A. 54B, 54C, 54D
are of primary use. They shall be used to convert from hydrometer readings of API gravity or relative density or density and volume measurements, first to obtain API gravity at 60 °F, or relative density 60/60 °F, or density at 15 °C, respectively, and then to find the volume corrected to the corresponding reference temperature. The other tables, which are reproduced in volume XI/XII, permit accurate conversion of measurements from one system of units to another and conversions between apparent mass in air, mass and volume.
3.4 The tables referred to in Annex A relate to the following ranges of density and relative density:
Table 5A and Table 6A: 1000 to 00 API
Table SB and Table 6B: 85° to 00 API
Table 5D and Table 6D: 100 to 45° API
Table 23A and Table 24A: 0.6 12
to 1.076 (60 °F160 °F)
Table 23B and Table 24B: 0.654
to 1.075 (60 °F160 oF)
Table 53A and Table 54A: 612
to 1074 kg/rn3 at 15°C
Table 53B and Table 54B: 654
to 1075kg/rn3 at 15°C
Table 53D and Table 54D: 80() to 1164 kg/rn3 at 15°C
3.5 For values below the ranges in 3.4 and down to 500 kg/m1 (0.500 kgIl) at 15 °C, reference shall be made to ASTM-IP-API Petroleum measurement tables for light hydrocarbon. liquids, in which the tables are identical with the corresponding tables in the 1953 metric edition of API 2540. ASTM D 1250 and IP 200 and referred to in ISOIR 91:1970. For values in terms of relative density in the equivalent range, reference shall be made to Table 33 and Table 34 of ASTM D 1250.
The tables relating to values down to the equivalent of 500 kg/rn3 are designated in Annex A by reference to footnotes 3 and 4 to that annex.
3.6 Computer sub-routines in ANSI FORTRAN and the required program documentation are available for each of the tables in volumes I to IX. This documentation and information on the background and development of the tables have been published in volume X entitled “Background, development, and program documentation” (see notes 2 and 3). Computer sub-routines in ANSI FORTRAN are included in volumes XIII and XIV for the tables in these volumes, but without implementation procedures.
The program documentation in volume X includes implementation procedures that are the primary standard. These procedures may be used to develop computer sub-routines in any computer language. Such a sub-routine that exactly follows one of the procedures (including the rounding and truncation operations specified) is a valid application of this part of ISO 91.
No implementation procedures are included in volumes XIII and XIV, but a procedure for Table 54D has been included in IP Petroleum Measurement Paper No. 2 as “Standard for volume correction of lubricating oils” and is a valid application of this part of ISO 91.