Custody transfer of LNG is performed on an energy basis, normally involving shipboard tank gauging combined with density and calorific value determination via gas chromatography. These methods (although various in their implementation), are well established, and guidelines exist to help in their implementation. The GIIGNL handbook gives estimates of uncertainty for volume, density and GCV of 0.21%, 0.23% and 0.30% respectively. In-line allocation and custody transfer measurement of LNG is a relatively new development. The nature of the fluid, and the lack of in-situ proving imposes requirements that are not easily met by many metering technologies. Ultrasonic and Coriolis meters both have many suitable characteristics for LNG measurement and have been shown to have acceptable measurement performance. The main advantage of Coriolis technology is that it is mass based, whereas ultrasonic meters can handle high throughput with very little pressure drop, and hence less risk of vaporization of LNG causing measurement errors.
Measurement of cryogenic LNG
2012
14 Seiten, 12 Bilder
Aufsatz (Konferenz)
Englisch
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