For the production of compressor country implements standardization of "two card" system, namely compressor production license and pressure vessel production license (storage tank).
国家对压缩机的生产实行规范化的“两证”制度，即压缩机生产许可证和压力容器生产许可证(储气罐)。
2
Reinforce to patrol vessel and measure the liquid tank and bilge water well frequently.
加强全船巡视检查，勤测各液体舱及污水沟等。
3
The spherical tank is the storage of liquefied gases, and one of the commonly used pressure vessel, in the petroleum, chemical, metallurgical and city gas supply and so widely used.