초록 ▼

A cryogenic meter is mounted in an insulated container having an inlet and outlet in circuit with the LNG delivery flow path. The container is filled with LNG to a level above the cryogenic meter to pre-cool it to a desired operating temperature. To maintain the level of LNG in the container during

A cryogenic meter is mounted in an insulated container having an inlet and outlet in circuit with the LNG delivery flow path. The container is filled with LNG to a level above the cryogenic meter to pre-cool it to a desired operating temperature. To maintain the level of LNG in the container during use and to separate vapor from liquid, a float device allows vapor to be returned to the storage tank from the container to refill it with LNG. Because the meter is continuously immersed in LNG during use, it is maintained at a constant temperature permitting the quantity of LNG delivered to a use device to be accurately metered. Temperature and/or pressure signals are sent to a microprocessor which computes the density of the LNG and displays the metered amount of LNG on a display.

대표청구항 ▼

Apparatus for accurately measuring the quantity of a liquid cryogen delivered from a storage tank to a use device via a fill line, comprising: a) an insulated container in circuit with the fill line; b) means for maintaining a desired level of liquid cryogen in said container including means for sel

Apparatus for accurately measuring the quantity of a liquid cryogen delivered from a storage tank to a use device via a fill line, comprising: a) an insulated container in circuit with the fill line; b) means for maintaining a desired level of liquid cryogen in said container including means for selectively venting the vapor in said insulated container to said storage tank to control refilling of said container with liquid cryogen; c) means, in said container below said desired level of liquid cryogen, for (i) measuring the flow rate and (ii) determining the density of liquid cryogen delivered to the use device through the fill line; and d) means for calculating, from the density and flow rate, the quantity of liquid cryogen delivered to the use device through the fill line.