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Title: Gas Meter Proving Using Sonic Nozzle-Venturis And Microprocessors
Author: B.W. Balls
Source: 1979 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1979
Abstract: AGA Report No. 6, Part IV, describes the use of critical flow (sonic velocity) orifice plates to test large capacity, displacement gas meters over a limited range of pressures, temperatures and gas specific gravities (1). Improvements using critical flow nozzle-venturis have been described 2,3 and an international standard method, proposed by IS0/TC30 W.G.5 describes two nozzleventuri designs 4. This paper reviews state-of-the-art use of sonic velocity test methods and shows how a microprocessor, combined with in-line density, pressure and temperature measurements and a selection of nozzleventuris enables automated meter proving in both shop and field. Shop-located, truck-mounted and permanent field installations are possible. Operating costs are reduced and accuracy is improved because the new method eliminates depenence upon test air, or gas conditions such as humidity and composition. The new method enables in-line testing of high pressure gas meters, such as turbine. Roots-type and orifice meters at operating conditions, without errors due to gas compressibility (Z) and other performance specification changes due to operating pressure. No error is caused by pressure pulsations.

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