Flow Measurement Performance Test ASME PTC 19.5
This Supplement describes the techniques and methodsb of all flow measurements required or recommended by the Performance Test Codes. Newer flow measurement techniques of comparably high accuracy are included to provide alternative flow measurements for special situations in which deviations from the requirements of a code are agreed to be necessary. This is a supplementary document that does not supersede the mandatory requirements of any code unless such anagreement has been expressed in writing prior to testing.
Except where specifically noted, the equations in this Edition are written in the primary system of units explained below. The reason for this practice is to simplify the text and focus on the physical, scientific principles involved in the measurement of flow. There are too many customary units in use throughout the various industries to publish all such physically identical variations in this book. It behooves the user, therefore, to convert his particular units into these primary units, calculate the flow, and reconvert the result back into his desired units. For international use, equations written
in which force is in pounds, mass is in slugs, length is in feet, and time is in seconds appear identical to equations in which force is in newtons, mass is in kilograms, length is in meters, and time is in seconds
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