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液化天然气(LNG)通常储存在约-161.5℃、0.1MPa左右的低温储存罐内。液化天然气(LNG)加气机在使用过程中温度一般为-160℃~-120℃,检定时,先采取液化天然气(LNG)加气机和检定装置的大循环制冷措施来降低管道的温度,但检定装置的管道仍易受外界环境的影响而温度升高,导致管道内液化天然气(LNG)的状态发生变化,使处于气相的部分增加,气液混合比超过一定值时计量误差较大,从而造成检定装置的计量检定失准。
Liquefied natural gas (LNG) is usually stored in a cryogenic storage tank at about -161.5 ° C and about 0.1 MPa. The liquefied natural gas (LNG) dispenser in the course of the use of temperature is generally -160 ℃ ~ -120 ℃, the test, the first to take the liquefied natural gas (LNG) dispenser and test device for large-cycle cooling measures to reduce the pipeline temperature, However, the pipeline of the verification device is still susceptible to the influence of the external environment and the temperature rises, resulting in the change of LNG status in the pipeline to increase the part in the gas phase. When the gas-liquid mixture ratio exceeds a certain value, the measurement error is large, Resulting in misjudgment of the verification of the verification device.