Unit of Measure Data Reference
Unit of Measure (UOM) Data Reference Configuration Introduction
The Analysis Framework has a built-in capability of making automatic conversions for units that belong to the same unit of measure class. For example, mass in kilograms and mass in pounds can be displayed and converted without any additional tool. However, it may be necessary to convert a value from one unit of measure class to another. These types of conversions are called "class-to-class conversions." The Unit of Measure Data Reference (UOM Data Reference) is provided for this purpose. For example, the calculation of a certain amount of mass can be obtained using a reference to a liquid volume and density.
The UOM Data Reference makes class-to-class unit-of-measure conversions. It contains all class-to-class conversions needed by Sigmafine to do analyses on mass, volume, composition, and density. When configuring the UOM Data Reference, you can use a dialog box-based wizard to select element (or Element template) Attributes needed to make the conversion\calculation. Attributes with the correct units of measure must be available for the calculation\conversion to take place.
The following table lists the Unit of Measure conversions supported by this data reference and the Attribute unit class required so that the conversion can be configured.
Unit of Measure Conversions
| Selection | Conversion |
|---|---|
| Mass to\from Mole | Mass to MolesMoles to MassMass Rate to Mole RateMole Rate to Mass Rate |
| Gas Conditions | Gas Standard Volume to Gas Actual VolumeGas Actual Volume to Gas Standard VolumeGas Normal Volume to Gas Actual VolumeGas Actual Volume to Gas Normal VolumeGas Standard Flow to Gas Actual FlowGas Actual Flow to Gas Standard FlowGas Normal Flow to Gas Actual FlowGas Actual Flow to Gas Normal Flow |
| FOE (Fuel Oil Equivalent) | FOE Volume to Standard Gas VolumeStandard Gas Volume to FOE VolumeMass to FOE MassFOE Mass to Mass |
| Mass to/from Volume (Liquids) | Liquid Volume to MassMass to Liquid VolumeMass Rate to Volumetric FlowVolumetric Flow to Mass Rate |
| Density | Specific Gravity to DensityDensity to Specific Gravity |
| Mass to/from Weight | Weight to MassMass to Weight |
| Pressure | Pressure Gauge to Pressure AbsolutePressure Absolute to Pressure Gauge |
| Mass to/from Volume (Gases) | Gas Standard Volumetric Flow to Mass RateMass Rate to Gas Standard Volumetric FlowGas Normal Volumetric Flow to Mass RateMass Rate to Gas Normal Volumetric FlowStandard Volume to MassMass to Standard VolumeNormal Volume to MassMass to Normal Volume |
| Physical Quantity to/from Physical Quantity Rate | Physical Quantity to Physical Quantity RatePhysical Quantity Rate to Physical Quantity |
Several of the unit-of-measure class-to-class data reference conversions require conversion constants with values that are user configurable. These constants are referenced in an Element named 'SF_GlobalFactors', which is in the same database.
The following figure shows where to locate this Element in System Explorer.
The 'SF_GlobalFactors' Element is a global element; therefore, the Element does not need to be in the model’s Element collection for the conversions to be used. The attributes' names for the different factors and their default values are listed in the following table.
Element SF GlobalFactors
| Attribute | Default Value |
|---|---|
| ReferenceTemp | 60 °F |
| ReferencePres | 14.73 psi |
| StandardTemp | 60 °F |
| StandardPres | 14.73 psi |
| StandardCompFactor | 1 |
| NormalTemp | 0 °C |
| NormalPres | 1 atm |
| NormalCompFactor | 1 |
| StdGasMolarVolume | 379.4932 scf/lbmole |
| NormalGasMolarVolume | 22.4146 Nm3/kgmole |
| BtutoFOEMass | 19720 Btu/lb |
| BtutoFOEVolume | 6,050,000 Btu/bbl |
| WaterDensityAtReferenceTemp | 0.9990121 kg/L |
| 0.9990121 kg/L | 0.9990121 kg/L |
| WaterDensityAtNormalTemp | 0.9991 kg/L |
| AirBuoyancyAdjustment | 0.0011 kg/L |