Stream qualities, such as density, sulfur, octane number, smoke point, and pour point, can be obtained from the same source, such as crude assay data or results of the latest test runs on different units. To minimize the stock balancing calculations, experience and engineering judgment are required to decide which qualities would be most restrictive and control the stock balance. For example, if the diesel end point from a given crude is determined to meet the pour point specifications, the sulfur specification may not be a problem and need not be calculated. Often, a stock balance has to be calculated several times. The effort of laying out the calculations and including all necessary yields and stream qualities in a spreadsheet can save considerable time.
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