We utilize an LPG conversion group with vapor space calculations. Why is the vapor mass not considered for volume UoM?

Vapor space calculations are defined in measurement standard ISO 6578. The calculation simply adds the vapor mass (and vapor energy or weight) to the appropriate liquid mass, energy and weight quantity (in any given UoM).
Volume quantity values are not updated with the liquid volume quantity value equivalent to the vapor mass and thus do contain the liquid product quantity value only (in any given volume UoM).
Therefore, it is important that the base UoM in the SAP material master is either a mass, weight or energy UoM.

Read the working paper “LPG vapor space calculations” for all details.

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