Tankvision Calculations
Endress+Hauser 49
8.4 Calculations for liquefied gases
The mayor difference in the calculation for liquiefied gases compared to liquids is that the
gas phase must be considered. Therefore a calculation for the mass of the product in the gas
phase must be applied.
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8.4.1 Total Mass
8.4.2 MBR method
• The method is based on a specific done by "Moore, Barrett & Redwood" in November 1985.
The calculation procedure was specified for "Whessoe Systems and Controls Ltd.".
• MBR specfy not just the gas calculation, it define a whole process to calculate VCF and RDC.
• This method is only for LPG’s intended but it might also give acceptable results for other
Chemical gasses - as long as the density and temperature are within the specified range.
• Density Input Range: 470 to 610 kg/m³.
• Temperature Inpute Range: -85 to 65 °C (-121 to 149 °F).
• It is not possible to use the M, B & R method for other Reference Temperatures than 15 °C.
Method is based on 10 steps:
1. Measure and input the data
2. VCF Calculation
3. Observed Density calculation
4. Calculate GSV
5. Calculate Liquid Mass
6. Calculate Vapor Volume
7. Calculate Vapor Density
8. Calculate Vapor Mass
9. Calculate Total Mass
10. Calculate Total Weight
Total Mass = Liquid Mass + Vapor Mass
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