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Title: Further Developments In The Design & Implementation Of An Advanced Online Condition Based Monitoring System & A Dirty Meter Prediction Model For Custody Transfer Ultrasonic Gas Flow Meters
Author: James N. Witte, Mike Thackray, Jeff Tilden, Peter Kucmas, Martin Novak
Source: 2011 North Sea Flow Measurement Workshop
Year Published: 2011
Abstract: After installation a calibrated ultrasonic flow measurement meter may begin to experience minute changes in measurement accuracy due to accumulation and deposition of foreign material in the meter tube, meter runs and piping. Even in pipeline quality gas, foreign materials may still be present. These are often carried over from processing, compression, or formed due to chemical and biological reactions between the natural gas, its constituents and the gas transport system. Any measurement device in the natural gas stream begins to be coated from the moment of installation until the moment it is taken out of service. The nature and character of the coatings continues to be a vast field of study. It should be understood that the coating material, thickness and apparent roughness does not need to remain constant over the service period of the flow meter nor of a consistent composition. It is also postulated that a dirty meter may or may not be fouled symmetrically thus adding to the over all complexity and understanding of this phenomenon.

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