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Title: Differential Testing Of Rotary Meters
Author: Craig Lam
Source: 2017 Western Gas Measurement Short Course
Year Published: 2017
Abstract: A Differential Rate Test is an accurate and convenient method of comparing a meters performance to previous or original performance records. It is widely recognized that many State Utility Commissions or other regulator y agencies accept it as a means of periodically substantiating that the original accuracy of a meter has remained unchanged. A change in internal resistance can affect the accuracy of a rotary meter. Any significant increase on the meters internal resistance to flow will increase the pressure drop between the inlet and outlet of the meter

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