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1·Forbid welding the flange after installing the valve. Both sides of the flange should be added the asbestos gasket.

严禁装上阀门后施焊法兰·法兰两边加石棉垫片。

2·The leakage event of a non-asbestos gasket was taken place at the manhole flanged joint of a boiler after more than one-year service.

一台废热锅炉人孔用非石棉纤维橡胶垫片服役一年多后发生泄漏。

3·By analyzing for the flange leakage on a heavy oil catalytic pyrolysis unit, the writer put forward a treatment method, i. e. to replace old asbestos gasket with a compound corrugated gasket.

通过对重油催化裂化装置中法兰泄漏原因的分析，提出了处理方法：将原石棉密封垫片改为波齿复合密封垫片。

4·For example, in order to prevent secondary pollution, even the use of sewage is not Valve asbestos packing and gasket sealing.

例如为了防止二次污染，即使是排污阀也不采用含石棉的密封填料和垫片。