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Title: Performance Of Wide Beam Clamp-On Ultrasonic Flowmeters In API Proving Tests Clamp-On( Custody Transfer By API Method)
Author: J. Baumoel
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: The current practice of the Petroleum industry requires use of the API proving method as a means of arbitrating the value of petroleum products passed between seller and buyer. The procedures for accomplishing this Proving are written around the use of Turbine or PD flowmeters and require a defined range of repeatability between successive runs using a Small or Large Volume Prover. Periodic service of these flowmeters is indicated when their repeatability deteriorates due to wear. Interest in the use of Ultrasonic flowmeters, which are less prone to wear factors than those meters that intrude into the flow, has been manifest in the API sponsorship of trials of Ultrasonic flowmeters to determine if a new Standard for Custody Transfer Proving could be based on these meters. Accordingly, a number of manufacturers of Ultrasonic meters were invited to submit meters for test. As a result, a number of manufacturers of Wetted Transducer Ultrasonic meters submitted instruments for test. Controlotron submitted System 1010S Wide Beam Clamp-On Spool Ultrasonic flowmeters for test in three areas Crude Oil Pipelines, Refined Product Pipelines, and Liquefied Gas Pipelines. All Controlotron System 1010S Meters performed with an average deviation of less than 0.05 percent on a multiplicity of different product batches in each liquid category. No intrusive flowmeter had better performance. What is particularly exciting about the API test program is that its results show performance under actual field conditions, which cannot be replicated by laboratory testing. While laboratory tests will always remain essential for validation of manufacturing controls, it is only by field-testing that a meters susceptibility to actual conditions can be revealed. This paper details the actual data obtained using the API proving method, and presents design details of the Controlotron meter that make such performance expected, rather than surprising. It discusses how a non-intrusive Clamp-On flowmeter deals with the application conditions that attack the performance of most other flowmeter types.

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