BS ISO 91:2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sources and usage guidelines for volume correction
  factors
Annex A (informative) - Changes to previous standards
Annex B (normative) - Standard reference conditions
Annex C (informative) - Titles of petroleum measurement
        tables given in the API-ASTM-IP-GPA standards for
        volume correction factors
Annex D (informative) - Other volume corrections factors
        standards
Bibliography

Pertains to temperature volume correction factors, which allow users to convert volumes, measured at ambient conditions, to those at reference conditions for transactional purposes.

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. This document also refers to compressibility factors required to correct hydrocarbon volumes measured under pressure to the corresponding volumes at the equilibrium pressure for the measured temperature. Table 1 shows the defining limits and their associated units of correction factors referenced in this document for crude oil, refined products and lubricating oils. These values are shown in bold italics . Also shown in the table are the limits converted to their equivalent units (and, in the case of the densities, other base temperatures). Table2 shows defining limits of correction factors for light hydrocarbons (natural gas liquids and liquefied petroleum gases). Table1 Defining limits of correction factors for crude oil, refined products and lubricating oils Crude oil Refined products Lubricating oils Density, kg/m3 @ 60°F 610,6 to 1163,5 800,9 to 1163,5 Relative density @ 60°F 0,6112 to 1,16464 0,80168 to 1,1646 API gravity @ 60°F 100 to –10 45 to –10 Density, kg/m3 @ 15°C 611,16 to 1163,79 611,16 to 1163,86 801,25 to 1163,85 Density, kg/m3 @ 20°C 606,12 to 1161,15 606,12 to 1160,62 798,11 to 1160,71 Temperature, °C –50,00 to 150 Temperature, °F –58,0 to 302 Pressure, psig 0 to 1500 Pressure, kPa (gauge) 0 to 1,034 × 104 Pressure, bar (gauge) 0 to 103,4 60°F thermal expansion
factor (α60), per °F 230,3 × 10 − 6 to 930,0 × 10−6 α60, Per °C 414,0 × 10−6 to 1674,0 × 10−6 Table2 Defining limits of correction factors for light hydrocarbons (natural gas liquids and liquefied petroleum gases) Density, kg/m3 @ 60 °F Density, kg/m3 @ 15 °C Density, kg/m3 @ 20 °C 350,0 to 688,0 351,7 to 687,8 331,7 to 683,6 Temperature °C Temperature °F −46,0 to 93,0 −50,8 to 199,4 Pressure Saturation conditions (bubble point or saturation vapour
pressure) (see Note 2 to 4.1) This document also specifies standard reference conditions of pressure and temperature for measurements carried out on crude petroleum and its products, including liquefied petroleum gases (see AnnexB). This document excludes specifying standard reference conditions for natural gas which are given in ISO13443[15].