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Title: Development Of A Large-Capacity High-Pressure Natural Gas Calibration Facility In China
Author: Guo Ming-Chang, Ding Jianlin, Wang Jin-Song, Steve Caldwell, Thomas Kegel, Jiunn-Haur Shaw, Fong-Ruey Yang
Source: 2008 South East Asia Flow Measurement Conference
Year Published: 2008
Abstract: This paper presents the development of a world class calibration facility constructed in conjunction with the PetroChina West-East Natural Gas Transmission Pipeline project (WEGP). The paper will discuss the need for the facility, the basis of measurement, the traceability developed and plans for the continued development. The system is anticipated to be fully operational by mid 2008. Measurement uncertainty goals (at 95% confidence level) are 0.10% for a primary standard, 0.20% for a set of secondary standards, 0.25% for a set of working standards, and 0.35% for a mobile prover. To meet the ever-stringent environmental concerns of cleaner energy for the industries and household sectors, China, as a world economic contributor, has devoted its efforts in constructing a cross-country 4000 kilo-meters natural gas transmission pipeline. Along the way, major gas measurement stations have been built for accurate control and custody transfer. Thus, a large-scale calibration station with mobile prover is needed for the dissemination of measurement standard. The facility provides calibration of DN400 gas flow meters under maximum operating pressure of 9.6 MPa with actual flow range from 8 m3/h to 12,000 m3/h. Based on a flowthrough principle, natural gas is drawn from a 1016mm, 10 MPa trunk line and regulated through the standard and test sections. A primary standard, made by a 1000 kg capacity gyroscopic weighing scale, a secondary working standard, made by a bank of sonic nozzles and a set of reference turbine meters, complete the self-traceable measurement standard. To provide constant control check, three sets of ultrasonic meter are also installed. The system is fully automated with secured human machine interface and validated numerical calculation procedures. A mobile prover, developed by Instromet Company in Belgium, consists of two turbine meters and an ultrasonic meter, will be circulated among the gas measurement stations, and this will provide field verification of meter performance. A quality assurance program based on ISO 17025 and uncertainty evaluation is underway through the consultancy assistance from CEESI. A preliminary uncertainty analysis is briefly described. The discussion includes test data obtained to support Type A estimates for several components. An informal inter laboratory comparison test was completed in December 2007, the testing and results are discussed. The results indicated good agreement with CEESI and PTB.

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