Abstract
This chapter provides an overview on the basic sediment and water test which is designed to determine the amount of water and sediments, or sludge that is present in a stock-tank crude oil. The water and sludge are accumulated and measured in a conical centrifuge tube. The test is described in the American Society for Testing and Materials (ASTM) manuals as D96-52T. It should be noted that this test does not remove all of the water contained in the oil. Some water remains as emulsified micelles that cannot be removed by the low speed centrifuge generally used for this test. Pear-shaped centrifuge tubes containing a small-diameter, graduated tube at the bottom should be used for samples that contain small amounts of Basic Sediment and Water (BS&W).
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