Oil Quantity Conversion

Use

This function allows volumes and masses at ambient temperature and densities at test temperature to be converted into densities, volumes, and weights at standard temperature. The system therefore converts an oil product quantity into various units of measure using quantity conversion.

Correcting the volume and density is necessary because small differences in temperature can lead to considerable fluctuations in the volumes of oil and oil products, which may in turn cause fluctuations in value.

Features

Oil quantity conversion is carried out using the oil and gas quantity calculator after integrating external programs . The system calls these external programs via an interface in the oil and gas quantity calculator.

Prerequisites

Definition of Units of Measure and Dimensions

The following units of measure are used for the oil quantity conversion:

  • Weight units of measure

  • Volume units of measure

    You can define volume units of measure for a certain temperature (for example, L15 as the unit of measure ‘liter at a temperature of 15 °C’).

  • Density units of measure

    You can define density units of measure for a specific temperature. The following density types are allowed for liquids:

    • API gravity (dimensionless)

    • Relative density (dimensionless)

    • Absolute density (SI unit: kg/m³)

      If you have not specified an absolute density unit, the system automatically uses the kg/m³ SI unit.Density units of measure for API gravity and relative density are not necessary, because those units are dimensionless as relations of density units. However, for documentation purposes, you can define and use dimensionless units of measure.

Material Master Record

You define a base unit of measure (stockkeeping unit) for the material in the material master record. This is the unit of measure for the stock quantity (base quantity) in the system. Because that base quantity also determines the valuation of the material, it is very important to choose a standardized unit of measure as the base unit of measure.

In addition, you can save a relation between two units of measure in the material master record as conversion factors. The system uses these conversion factors for all planning calculations for a material, as long as the real quantities from goods movements are not known. The unit of measure relation for each material is a sub-definition of the unit of measurement definition. The unit of measurement definition is valid globally for all materials.

You can also enter hydrocarbon-specific data in the material master.

Assigning a Conversion Group

You activate the quantity conversion interface for the material when you assign a conversion group to a material in the material master record.