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Title: Improved Meter Performance Characterizations For Liquid And Gas Turbine Meters
Author: G. E. Mattingly
Source: 2009 International Symposium on Fluid Flow Measurement
Year Published: 2009
Abstract: Increasingly, todays liquid and gas turbine meter users seek high accuracy performance in extremely wide ranges of fluid and flow conditions. While liquid turbine meters need high accuracy across extremely wide ranges of fluid viscosity for equitable custody transfer of costly fluids such as oil or LPG and for satisfactory fuel measurements in engine monitoring and performance testing, gas turbine meters need high accuracy across extremely wide ranges of gases and pressure to equitably sell and distribute natural gas or, for example, to handle hydrogen gas in future energy systems. Over all of these conditions, calibration results should satisfactorily characterize meter performance over the widest feasible turndown - i.e., the maximum to minimum flow rate ratio. Initially, turbine meter designers achieved turndowns of 10 or 20 to 1 on flow rate, for the specific liquid viscosity or for the specific gas and pressure used in the calibration. However, when liquid viscosity or gas pressure differed from calibration values, turbine meter turndowns decreased or meter uncertainty increased or both, thus reducing the meters rangeability.

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