ABBREVIATION for pounds per square inch, gauge 磅／平方英寸，表压
Pressure rating: 250 psig air.
压力等级：250 PS IG中的空气。
Containers used for transporting liquid nitrogen at pressures greater than 25 psig (40 psia) need to be designed, manufactured, and tested to DOT specifications.
用于运输压力大于25 ps ig (40 psia)的液态氮的容器需要按照DOT规范设计、制造和检测。
When the tank pressure reaches 305 psig, a mechanical air-cooled refrigeration unit is activated which cools the tank contents and thereby reduces the pressure to about 295 psig.
当容器压力达到305 ps ig时，启动机械空气冷却制冷设备，使容器内容物降温，从而压力降到约295 ps ig。
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