ISO 91-2017 pdf free.Petroleum and related products —Temperature and pressure volumecorrection factors (petroleum measurement tables) and standardreference conditions.
This document refers to temperature volume correction factors, which allow users to convert volumes,measured at ambient conditions, to those at reference conditions for transactional purposes. Thisdocument also refers to compressibility factors required to correct hydrocarbon volumes measuredunder pressure to the corresponding volumes at the equilibrium pressure for the measuredtemperature.
Table 1 shows the defining limits and their associated units of correction factors referenced in thisdocument for crude oil, refined products and lubricating oils. These values are shown in bold italics.Also shown in the table are thelimits converted to their equivalent units (and, in the case of the densities,other base temperatures).Table 2 shows defining limits of correction factors for light hydrocarbons(natural gas liquids and liquefied petroleum gases).
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
For the purpose of custody transfer in accordance with this document, reference shall be made to APIMPMS Chapter 11.1-2004/Adjunct to ASTM D1250-04 and IP 200/04, including Addendum 1-2007.
APIMPMS Chapter 11.1-2004/Adjunct to ASTM D1250-04 and IP 200/04, including Addendum 1-2007,recognizes three distinct commodity groups: crude oil, refined products, and lubricating oils.A special application category is also included which provides volume correction based on the input of anexperimentally derived coefficient of thermal expansion.
For density/weight/volume intraconversion，reference shall be made to API MPMS Chapter 11.5 Part 1 to Part 3/Adjunct to ASTM D1250-08 and lP 200/08.These standards provide conversion ofmeasurements from one system of units to another for both in vacuo and in air values.
For NGL and LPG, reference shall be made to API MPMS Chapter 11.2.4-2007/GPA Technical PublicationTP-27-2007.The implementation procedures describe how to calculate the CTL given an appropriatedensity factor at basis temperature and an observed temperature, and calculate the appropriate densityfactor at basis temperature given a relative density at an observed temperature. The implementationprocedures are presented in pairs by base temperature.First, the procedures for Tables 23E and 24E ofAPI MPMS Chapter 11.2.4-2007/GPA TP-27-2007 at a 60°F base temperature are given.The procedurefor Table 23E makes use of the procedure described in Table 24E, thus Table 24E is presented first.These are followed by procedures for Table 54E and Table 53E at a base temperature of 15 °C, whichthemselves make use of the procedures in Table 23E and Table 24E; these in turn are followed by theprocedures for Table 60E and Table 59E at a base temperature of 20 °C, which also make use of theprocedures described in Table 23E and Table 24E.ISO 91 pdf download.