石油、化工、冶金部门有大量压力容器、管道设施,在投入运行前必须试压。除试压技术及设备外,环境温度也是影响试压工作的重要因素。例如唐钢焦化厂煤气总管及粗苯、脱硫塔等在二月份-10～-15℃气温时,因水压试验可能冻坏设备不能采用; Petroleum, chemical, metallurgical departments have a lot of pressure vessels, pipeline facilities, put into operation before the pressure test. In addition to the pressure test technology and equipment, the ambient temperature is also an important factor affecting the pressure test. For example, Tangshan Iron and Coking Plant Gas Explorer and crude benzene, desulfurization tower in February -10 ~ -15 ℃ temperature, the hydrostatic test may freeze the equipment can not be used;