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Title: A Turbine Meter With Built-In Transfer Prover W. m. Schieber
Author(s): [Not Available]
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: A new class of gas turbine meter is presented that evaluates the accuracy of the meters mechanical output by using the well-known transfer proving method. The accuracy is determined under actual operating pressures and temperatures without interrupting the normal service of the meter. No pressure or temperature measurements are required for determining accuracy. The built-in master meter is a second turbine meter built into the outlet of the meter body. Other types of transfer proving systems could be integrated into the meter, however, such as, a differential pressure meter or an ultrasonic meter. The primary function of the built-in master meter is to determine error in the main cartridge resulting from changes in mechanical friction. A second function is determining meter error due to upstream swirl caused by the effect of the installation. Tests have shown that the meter accuracy agrees within 0.20% of the accuracy obtained from a primary standard for extreme changes in mechanical friction or severe upstream swirl. The meter can also detect and warn of other causes of meter error, such as, jetting, pulsating flow, on-off flow, partial blockage, and bent or broken rotor blades although the measured accuracy may differ from the true accuracy.

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