PSIA
PSIA stands for pounds per square inch absolute, which is a unit of pressure used in maritime industry to measure the pressure of gases and liquids. It is the pressure relative to a perfect vacuum. PSIA is commonly used in the measurement of compressed air and gas systems, as well as in the calibration of pressure gauges and other pressure measuring instruments. In the maritime context, PSIA is used to measure the pressure of gases and liquids in various systems on board ships, including the fuel oil system, ballast water system, and cargo handling system.
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