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Title: NATURAL GAS LIQUID MEASUREMENT-DIRECT & INFERRED MASS
Author: Dean Minehart
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: Natural Gas Liquid (NGL) streams consist of mixtures of hydrocarbons including ethane, propane, butane, pen- tane and natural gasoline. NGL is sometimes referred to as y-grade. The American Petroleum Institute (API) Manual of Petroleum Measurement Standards (MPMS) Chapter 14 Section 7 provides guidance on the mass measurement of NGL. Mass measurement techniques are applied to NGL measurement due to solution mixing of a variable fluid composition within the NGL stream. Mass measurement can be achieved by direct measure- ment (Coriolis flow meter) or inferred by multiplying a volumetric flow rate times flowing density. This paper will discuss the relative advantages of direct mass measure- ment for NGL streams. NGL stream components are bought and sold on a volu- metric basis. Conversion of measured mass during a measurement interval to the volume of each NGL stream component will be discussed.

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