Standard

BS ISO 91:2017

Petroleum and related products. Temperature and pressure volume correction factors (petroleum measurement tables) and standard reference conditions

Current

•

Published:

30 Jun 2017

1 Scope

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). Table 2 shows defining limits of correction factors for light hydrocarbons (natural gas liquids and liquefied petroleum gases).

Table 1 — 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 1 163,5*		*800,9 to 1 163,5*
Relative density @ 60 °F	0,611 2 to 1,164 64		0,801 68 to 1,164 6
API gravity @ 60 °F	100 to –10		45 to –10
Density, kg/m³ @ 15 °C	611,16 to 1 163,79	611,16 to 1 163,86	801,25 to 1 163,85
Density, kg/m³ @ 20 °C	606,12 to 1 161,15	606,12 to 1 160,62	798,11 to 1 160,71
*Temperature, °C*	*–50,00 to 150*
Temperature, °F	–58,0 to 302
*Pressure, psig*	*0 to 1 500*
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 1 674,0 × 10⁻⁶

Table 2 — 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 Annex B).

This document excludes specifying standard reference conditions for natural gas which are given in ISO 13443^[¹⁵^].

Product Details

Descriptors

Volume

Relative density

Standard temperature

Density

Tables (data)

Petroleum products

Petroleum

ICS Codes

75.180.30 Volumetric equipment and measurements

Committee

PTI/12

International relationships

Identical to:

ISO 91:2017

ISBN

978 0 580 85353 1

Publisher

BSI