The tank is used for liquid ammonia storage.Ammonia is a colorless liquid with a strong pungent odor. Ammonia as an important chemical raw material for transport and storage facilities, usually gaseous ammonia liquid ammonia obtained by pressurizing or cooling.Ammonia production process once the liquid ammonia tank leakage, fire explosion, poisoning, ranging from causing stop production system, will cause heavy casualties, environmental pollution and other disastrous consequences of the accident. Therefore, to do the safe operation of liquid ammonia tank, maintenance, emergency response and other preventive measures is very important.