MASS MEASUREMENT OF NATURAL GAS LIQUIDS Class # 2250

摘要

Natural Gas Liquid(NGL) streams consist of mixtures of hydrocarbons including ethane,propane,butane,pentane 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 to avoid measurement errors that are caused by the solution mixing within the NGL stream.Mass measurement can be achieved by direct measurement(Coriolis flow meter) or inferred by multiplying a volumetric flow rate times flowing density.This paper will discuss both methods and the relative advantages of direct mass measurement for NGL streams.Individual components in an NGL stream are bought and sold on a volumetric basis.There is a simple process to convert the measured mass of the combined NGL stream into the standard volumes of each individual component for this purpose.