Method for calculating inventory of LNG (Liquefied Natural Gas) gas station

• Main Authors: Wang Yanchao, Xie Xin, Zhang Kongming, Zhou Songjing, Wang Xuhui, Wang Guanghui, Liang Shixi
• Format: Patent
• Language: Chinese; English
• Published: 03.08.2016
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

The invention relates to a method for calculating an inventory of an LNG (Liquefied Natural Gas) gas station, and belongs to the field of LNG storage and transportation. According to the method disclosed by the invention, a double-differential-pressure type liquid level meter system is adopted; a height difference of two liquid-phase pressure measuring points of the double-differential-pressure type liquid level meter on a vertical plane is H, and H cannot be equal to zero and is definitely marked in a working drawing of a storage tank; a method for measuring a LNG density and volume by utilizing the H value can dynamically and accurately calculate actual storage capacity of LNG in the vacuum insulated storage tank in the actual production of the LNG gas station in real time. The calculating method can meet the requirement of the gas station operation final inventory, which is regulated by the enterprise management operating system. The calculating method also can be applied to other LNG facilities adopting a