Hazards: Under the moisture working conditions, the highly sophisticated machinery and equipment is very susceptible to breakdown. Due to the all-time operation of the refrigerating compressor, the poor maintenance, overload working, lubricating/cooling problems could cause to breakdown the compressor. The electric machines are highly exposed due to the wet operating conditions. Their design should therefore provide for protection against jets and flow of water. For the steam boiler, the low level of water in the boiler due to the failure of feeding pump could cause the severe collapse and explosion.