ISO 91-2-1991 pdf download – Petroleum measurement tables – Part 2: Tables based on a reference temperature of 20 “C.
1 Scope This part of ISO 91 refers to Computer implemen- tation procedures for the correction of densities and volumes to the reference temperature of 20 “C (see note 1 ). The implementation procedures referred to do not cover the full range of tables referred to in patt 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 OC, using the Same expansion data as used for the tables referred to in ISO 91 -1 . NOTES 1 Although the Standard reference temperature for pet- roleum measurement adopted in ISO 5024 is 1 5 T 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 OC is still widely used. 2 Tables relating to lubricating oils and the reference temperatures of 15 “C and 60 OF are proposed for adoption in a revision of ISO 91 -1 in course of preparation. 2 Normative reference The following Standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 91 . At the time of publication, the edition indicated was valid. All Standards are sub- ject to revision, and Parties to agreements based on this part of ISO 91 are encouraged to investigate the possibility of applying the most recent edition of the Standard indicated below. Members of IEC and ISO
maintain registers of currently valid International Standards. ISO 91 -1 :1982, Petroleum measurement tables – Part 1: Tables based on reference temperatures of 1 5 “C and 60 degrees F. 3 Source of Computer implementation procedures 3.1 The Computer implementation procedures have been published by the Institute of Petroleuml) as Petroleum measurement Paper No. 3: Computer implernen ta tion procedures for correc fing densities and volumes to 20 OC, October 1 988. The six im- plementation procedures are designated by table numbers for continuity with the tables referred to in patt 1 of this International Standard and are as fol- lows: Table 59A – Implementation procedure for sub- routine TAB59A – Generalized crude oils – Correction of observed density to density at 20 T Table 60A – lmplementation procedure for sub- routine TABGOA – Generalized crude oils – Correction of volume to 20 “C against density at 20 “C Table 59B – Implementation procedure for sub- routine TAB59B – Generalized products – Cor- rection of observed density to density at 20 “C Table 60B – Implementation procedure for sub- routine TABGOB – Generalized products – Cor- rection of volume to 20 “C against density at 20 T