We have a turbine flow meter, gas chromatograph & flow computer installed at our site, and similar units are installed at the GAIL terminal also.
How metering can be done with these two setups? GAIL (gas distribution company) people used to do turbine flow meter calibration, is it possible to do calibration on-site for a turbine-type flow meter? Please let me know the procedure if any.
Turbine Flow Meter Verification
No calibration is done on a Turbine flow meter. The meter can only verified or proved against a standard reference measurement.
Meter proving is a physical test used to determine the accuracy and performance of the meters.
The turbine meter can be proved by placing the meter in series with a meter prover which has a known or base volume in such a way that the fluid measured by the meter is also measured by the prover.
Regardless of the prover or meter type, the basic proving principle is as follows
The above needs to be updated in the Flow computer. Gas chromatograph will provide the online gas composition which can be used to calculate the molecular weight and Specific gravity of the fluid being measured.
Basic Diagram
 A basic diagram of a meter proving is described below:
For more information, kindly refer to compact provers from Emerson and API chapter 4 which covers the proving of meters.
Author: Arunbalaji Baskar
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