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Title: The Accutest, A Self-Proving Gas Turbine Meter
Author: William m. Schieber
Source: American Gas Association 1999
Year Published: 1999
Abstract: The AccuTest is a new class of gas turbine meter capable of evaluating its accuracy under actual operating flow rates and pressures without interrupting the normal service of the meter. The meter is specially suited for evaluating the effects of mechanical friction or installation effects. The meter can also detect and warn of all other causes of meter error, such as jetting, pulsating flow, on-off flow, partial blockage, and bent or broken rotor blades. The self-diagnostics includes a warning indicator that alerts of potential problems developing in the metering system. The actual flow rate is electronically corrected for changes in meter accuracy. The self-proving feature of the AccuTest is achieved by building a master meter into the outlet section of the meter housing. The master meter is a second turbine meter cartridge with special design features to significantly reduce the chance of malfunction of master meter compared to the upstream main cartridge. These design features are unique to the built-in master meter and can not be readily extended to the main cartridge. In addition to the self-proving feature, the main measurement cartridge of the meter is enhanced to improve its accuracy, repeatability, rangeability, and reliability through design features that will be discussed in detail later in the paper. A novel patented design feature known as the trailing edge flap was developed for the turbine blades that allows the meter accuracy to be optimized for changes in line pressure.

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