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Title: Accutest - The Worlds First Transfer Proving Turbine Meter With The Accuracy Adjusting Mercury Accutest Corrector
Author: Douglas H. Bethune
Source: American Gas Association 2004
Year Published: 2004
Abstract: The patented ACCUTEST Turbine Meter, an apparatus for accurately measuring gas flow in a gas pipeline (and its comprised methods) was first introduced in 1999. The apparatus is built and calibrated as a complete double rotor meter, made up of two individual rotor measuring modules, in close proximity of each other and housed in the same meter body. The main rotor, with 30 or 45 degree pitched blades, rotates clockwise. The second reference metering rotor is placed behind (downstream) the main rotor and rotates in a counter-clockwise direction using an 18-degree pitched rotor. The rotors are isolated from each other by incorporating flow-conditioning vanes ahead of the second rotor, allowing both rotor modules to operate totally independent and rotating in opposite directions. In this arrangement, the reference rotor is more reliable than the main rotor since its bearings are more protected from gas contaminants.

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