A New Tool to Improve Fiscal Monitoring and Custody Transfer in The Oil and Gas Industry

Michael D Collins, Neculai Moisoi

Abstract

Typically, differential pressure transmitters used for fiscal monitoring and custody transfer purposes are often calibrated with the low side open to atmosphere. If the relevant line pressure is not applied during the calibration of differential pressure transmitters, the validity of the calibration is questionable.
It is widely acknowledged that the output of differential pressure transmitters changes with line pressure due to mechanical distortion of the wetted parts. Although the distortion is thought to be extremely small, the high degree of sensitivity results in a significant change of output.
The main reason these devices are not calibrated at line pressures is the high cost and complexity of existing calibration standards, usually twin post piston gauges and pressure dividers.
This paper gives an overview of the early development of a new differential pressure standard, more stable and accurate than the classical twin post balances. This new differential pressure standard is easy to use and the time required to perform the measurements is considerably reduced compared with the more established traditional methods. The line pressure range is 0 to 30 MPa with a differential pressure range of 0.1 to 700 kPa. The piston gauge will be described in detail including its metrological characteristics and ease of operation.

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IMEKO-TC3-2005-086u.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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