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Title: Results Of A Long - Term Intercomparison Between Two High - Pressure Gas Flow Facilities
Author: Jos Van Der Grinten, Frans Doorman
Source: 2014 South East Asia Flow Measurement Conference
Year Published: 2014
Abstract: As part of a two and half year intercomparison between the Westerbork and EuroLoop cali bration facilities in The Netherlands more than 100 meter calibrations were performed with three 20 ultrasonic meters, three 20 turbine meters and one 24 ultrasonic meter. Although the primary objective was to demonstrate the similarity of the performan ce of the Westerbork and EuroLoop facilities, the intercomparison resulted in valuable information usable for field operation: ? The meter stability trend varies between - 0.001%/year for the best meter and +0.102%/year for the worst meter. These figures can change substantially depending on the time interval and the dataset chosen. ? The best achievable high - pressure calibration uncertainty under laboratory condition is approximately 0.20%. Repetition of the calibration shows that the meter curves have a bandwi dth of 0.20% 0.60%. If two meters are put in series the difference of their meter curves show the same bandwidth, which means that it is impossible to measure more accurately with the available technology. ? Upstream disturbances can have a substantial inf luence on the stability of the meter readout. Examples are thermowells installed between meters which can lead to a less stable reading of the downstream meter. ? Downstream disturbances like expanders and filters can have upstream influences. Sufficient pip e length is of vital importance

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