API MPMS CH9.4 : 2018

1 Scope
2 Field of Application
3 Normative References
4 Terms, Definitions, and Symbols
5 Safety Precautions
6 Density Determination Methods
7 Equipment
8 Applications of Continuous Density
   Measurement
9 Performance Requirements - System and Density
   Meter
10 Design of Density Measurement System
11 Proving, Verification, or Calibration of Liquid
   Density Meters
12 Calculations
Annex A (informative) - Density Sensitivity - Light
        Hydrocarbon Liquids
Annex B (normative) - Test Equipment - Pycnometer
        Calibration and Proving
Annex C (normative) - Pycnometer Calibration - Laboratory
        Method
Annex D (normative) - Density Meter Proving - Pycnometer
        Method
Annex E (informative) - Derivation of Air Buoyancy Equation
Annex F (informative) - Reference Fluids (Air and Water)
Annex G (informative) - Conversion Factors
Annex H (normative) - Offline Density Meter Factor
        Determination for Crude Oils and Viscous Fluids
Annex I (normative) - Density Used in Volume Calculation
Annex J (informative) - Concepts of Mass and Weight
Bibliography

Defines the continuous on-line determination and application of flowing liquid densities for custody transfer. Also covers liquid and dense phase fluids, including: natural gas liquids, refined products, chemicals, crude oil, and other liquid products commonly encountered in the petroleum industry.