BS ISO 91:2017

BS ISO 91:2017 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).


Cross References:
ISO 91-2:1991
ISO 13443:1996
ISO 9770:1989 (R10)
ISO 91-1:1992
ISO/R 91:1970
ISO/R 91:1959
ISO/R 91:1970/Amd 1:1975
ISO 91-1:1982


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