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Title: Liquid Sampling
Author: E. L. Graves
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: I wish to acknowledge the help of many people for information and ideas for this report. Particular thanks to Mr. R. E. Boyle, Amoco Oil Company and Mr. David Luce, True-Cut Manufacturer. Sampling of an oil stream, particularly crude oil, which carries 0.2% or more of free water, dirt, or sand in varying degrees, is reasonably difficult. Most people agree that a continuous sampling procedure taking out small amounts of liquid strictly proportional to flow is the best method of sampling. To take a sample, of course, a sample probe of some type is used. A probe extending to the center of the line and beveled at a 45 angle facing upstream is generally accepted to be the best design. Others use a long radius elbow facing upstream. Still another type is a probe with a cavity so that the stream can travel through the cavity, and then it is closed and a discrete amount of liquid is taken off as a sample. Note that in all cases the probe extends to near the center of the flowing stream.

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