A New Gravimetric Primary Standard for Natural Gas Flow Measurement at KOGAS

Young-Cheol Ha, Myoung-Seok Kwak, Woong Kang

Abstract

A new static gravimetric primary standard facility, which was constructed at the Incheon LNG terminal of Korea Gas Corporation (KOGAS) in 2017, is currently operated at pressures up to 5 MPa. Its main tasks include calibrating the secondary flow standard of the KOGAS high-pressure calibration facility (closed-loop type) and establishing the national primary standard for high-pressure natural gas flow measurement. To these aims, 1) the systematic error, which occurred due to an overlap diverter and has not yet been identified, was experimentally estimated for this facility, and 2) an interlaboratory comparison between KOGAS and Korea Research Institute of Standard and Science (KRISS) was performed using five critical flow Venturi nozzles in 2018. Consequently, the systematic error was estimated to be about 0.06 %, and the degree of equivalence between KOGAS and KRISS was evaluated to be within ±0.23. The paper describes the standard facility and the comparison results.

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IMEKO-TC9-2019-115.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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