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Title: Provability Of Liquid Ultrasonic Meters
Author: Ernie Hauser Bobbie Griffith Dr. Gregor Brown
Source: 2016 Canadian School of Hydrocarbon Measurement
Year Published: 2016
Abstract: Custody Transfer of Petroleum Crude Oils and Products has historically been accomplished by first positive displacement systems or meters, and later by turbine type flow meters. All of these devices are subject to drift or changes in calibration factors over time or with different conditions as compared with original calibrations. This, and the need for verified records of transactions to prevent nefarious impulses, led to the common use of in situ provers to periodically verify or modify the calibration factor of the meters. Provers thus became the traceable reference standard against which the duty custody transfer meter could be verified. When ultrasonic meters came onto the scene, they offered the promise of long-term stability and operation over multiple products and crudes, in addition to lower maintenance requirements. However, the need for traceability and verification in service remained.

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