BS ISO 6578:2017

1   Scope This document specifies the calculation procedure to convert the volume of liquefied petroleum gas ( LPG ) and liquefied natural gas ( LNG ) under the conditions at the time of measurement to the equivalent volume of liquid or vapour at the standard condition, i.e. 15 °C and 101,325 kPaA, or to the equivalent mass or energy (calorific content). It applies to the quantities of refrigerated hydrocarbon liquids stored in or transferred to/from tanks and measured under static storage conditions. Calculation of pressurized gases is out of the scope of this document.