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Title: Laboratory Versus In Situ Proving Of Liqu Id Ultrasonic Meters
Author: Terry Cousins
Source: 2014 International School of Hydrocarbon Measurement
Year Published: 2014
Abstract: The first issue to consider is what features do USMs claim that make such the concept of non-in situ proiving possible? A turbine meter for example should never be considered for use as an unproved system for good uncertainty measurement. This is because a turbine meter is so subject to installation effects, that the chance of the calibration at a laboratory transferring to the operat ional installation with any degree of confidence is low. Multi-path ultrasonic meters, however, it is claimed can transfer their calibr ation with more confidence, therefore removing the need for in situ proving. In fact at the introduction of USMs for custody transfer there was a concerted campaign to use them withou t provers, largely because they were so difficult to prove on site. This issue will be discussed in mo re detail in a later section on installation uncertainty.

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