Overused phrase: design pressure of nitrogen-sealed tanks
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There is an 8-cubic-meter sulfuric acid tank equipped with a nitrogen seal; the nitrogen pressure is 0.4 MPaG, and it is reduced to 2 kPa by a self-acting pressure regulator. Is it reasonable for the design pressure of the sulfuric acid tank to be at atmospheric pressure? I searched for some posts on the forum, but didn’t find a clear answer; please give some advice! !
I don’t think there’s any problem. Our storage tanks are designed for a pressure of 5 KPa, and the nitrogen used for sealing is also low-pressure nitrogen at 170 KPa.
Sure. 2KPa is considered as atmospheric pressure for the tank.
Generally, pressures below 2500 PA can be considered normal pressure.
Below 1960 Pa is a normal-pressure tank
It can be designed as a pressure-vessel at normal pressure, but accident relief equipment must be installed, and the ventilation volume must be calculated carefully to ensure that the storage tank can meet the exhaust requirements in the event of a failure of the pressure relief valve, thereby preventing overpressure. Another question is why the sulfuric acid tank needs to be nitrogen-sealed