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Title: Field Testing By Transfer Proving
Author: Ronald L. Cawlfield
Source: 1990 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1990
Abstract: There currently exists three types of field proving equipment for testing large diaphram, rotary and turbine meters. The three types are low pressure, critical flow arid transfer provers. Both low pressure and transfer proving are generally performed with air and at a vacuum (or in the case of low pressure proving optionally at a slight positive pressure) while critical flow proving is done with gas at 15 #s plus. For transfer proving, the prover is located on the outlet side of the meter being tested, as it is for critical flow proving.

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