Pressure of low-pressure gas breaking through the water seal
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The device contains low-pressure gas, which is discharged to the flare through a water seal tank. The liquid level in this water seal tank is between 500–1000 mm. When low-pressure gas is discharged to the flare, does its pressure need to be higher than that of the water seal tank? What is the corresponding pressure value for a liquid level of 500–1000 mm? Thank you
The liquid level height of the water seal can be directly converted into the pressure of the liquid column, which is generated by gravity. For every 10 mm increase in liquid level, 1 millibar of pressure (1 mbar) is generated at the bottom. Therefore, if the liquid level in the water seal tank is 500mm–1000mm, this will correspond to a pressure of 50 mbar–100 mbar (or, converted to standard atmospheres, 0.05–0.1 atmosphere). For low-pressure gas to be discharged into a flare, the pressure required must be at least higher than the pressure generated by this water seal tank, that is, it needs to be greater than 50 mbar–100 mbar. This is necessary to generate sufficient pressure to push the gas out from the bottom of the tank. Please note that this is only a theoretical calculation; in practical applications, other factors such as pipeline resistance and temperature effects may also need to be taken into account. .
\"HG-T 20570.17-1995 Installation of Liquid Seals\" provides descriptions of the liquid seal structures, precautions, and methods for determining their height.