ISO 91-2:1991 pdf download.Petroleum measurement tables
This part of ISO 91 refers to computer implemen-tation procedures for the correction of densities and volumes to the reference lemperature of 20 °C (see note 1). The implementation procedures referred to do not cover the full range of tables referred to in part 1 of this International Standard, but provide for those tables designated in part 1 as being for pri-mary use. In addition, reference is made to im-
plementation procedures for use with lubricating oils that are not included in ISO 91-1:1982 (see note 2).
This part of ISO 91 provides for the reference tem-perature of 20 °C, using the same expansion data as used for the tables referred to in ISO 91-1.
NOTES
1 Although the standard reference temper ature for pet-roleum measurement adopted in ISO 5024 is 15 °C and should be used in international trade, it is recognized that its use is not yet universally accepted and that the refer-ence temperature of 20 °C is still widely used.
2 Tables relating to lubricating oils and the reference temperaturcs of 15 °C and 60 °F are proposed for adoption in a revision of ISO 91-1 in course of prepar ation.
3.1 The computer implementation procedures have been published by the Institute of Petroleum1 as Petroleum measurement paper No. 3: Computer immplementation procedures for correcting densities and volumes to 20 °C，October 1988. The six im-plementation procedures are designated by table numbers for continuity with the tables referred to in part 1 of this International Standard and are as fol-lows:
Table 59A一Implementation procedure for sub-routine TAB59A 一Generalized crude oils Correction of observed density to density at 20 °C
Table 60A一Implementation procedure for sub-routine T AB60A - Generalized crude oils - Correction of volume to 20 °C against density at 20 °C
Table 59B一Implementation procedure for sub-routine TAB59B一Generalized products 一Cor-rection of observed density to density at 20°C Table 60B一Implementation procedure for sub-routine TAB60B一Generalized products一Cor-rection of volume to 20 °C against densily at 20°C
Such publications are reprinted from time to time. If corrections are included in such reprints, the IP 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.
A list of errata was published by the IP in January 1989 and supplied with all copies of Petroleur measurement paper No. 3. Users of this part of ISO 91 shall ensure that the corrections in the errata slip are used.ISO 91-2 pdf download.