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Title: Crude Oil Sampling For Custody Transfer (L.A.C.T./A.C.T.)
Author: Leland S.Hastings
Source: 1992 International School of Hydrocarbon Measurement
Year Published: 1992
Abstract: As stated in A.P.I. Manual of Petroleum Measurement Chapter 6, Metering Assemblies 6.1.4.1. Sampling. In most instances the value of a crude oil run is determined on the basis of net standard volume, which includes corrections for meter factor, temperature, pressure, and water and sediment content. Therefore, the composite sample accumulated in a run period, and any portion used for the determinationof density (gravity) and water and sediment content, must be representative of all crude oil delivered. Where density (gravity) and water and sediment content are based on a sample fccsii the composite sample of the run, the procedures used must ensure that this secondary sample is representative of the composite sample. Where density (gravity), water and sediment content, or other physical characteristics do not affect the value of a crude oil, sampling may be eliminated by mutual agreement (see Chapter 8 for additional details). The sampling should be proportioned to the flow rate through the meter, either directly by the meter or by an appropriate timing device.

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