scope:

This Addendum specifically covers inferred mass measurement systems utilizing flow computers as the tertiary flow calculation device and either turbine or displacement type meters, working with on-line density meters, as the primary measurement devices. The Scope does not include system using calculated flowing densities, i.e., Equations of State. The hardware is essentially identical to that referenced in API MPMS Chapter 21.2 and the methods and procedures are as described in API MPMS Chapters 14.4, 14.6, 14.7 and 14.8. Audit, record keeping, collection and calculation interval, security and most other requirements for systems covered in API MPMS Chapter 21.2 will apply to this Addendum. As in Chapter 21.2, the hydrocarbon liquid streams covered in the scope must be single phase liquids at measurement conditions.

APPLICATION

The procedures and techniques discussed in this document are recommended for use with new measurement applications. Liquid measurement using existing equipment and techniques not in compliance with this standard may have a higher uncertainty than liquid measurement based on the recommendations contained in this document.

ELECTRONIC LIQUID MEASUREMENT (ELM)

The term "electronic liquid measurement," or ELM, will be freely used throughout this document to denote liquid measurement using electronic metering systems. (Also see 3.20 in Chapter 21.2.)