Under what operating conditions do low-temperature conditions exist in liquid ammonia storage tanks at low temperature and normal pressure?
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A low-temperature, atmospheric-pressure liquid ammonia storage tank is equipped with a vacuum-breaking safety valve. Under what conditions will this tank experience negative pressure, and how is pressure increased in such conditions?
A rapid drop in liquid level creates a vacuum in the gas phase space, which is an issue that must be taken into account in fixed-roof storage tanks; however, ammonia being a toxic substance makes the situation somewhat special.