Flanges for gasification pipelines
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In the Texaco gas chemical unit of our company, flat-sealed wound gaskets are used for medium-pressure pipelines; could everyone please discuss whether high-pressure lens gaskets can be used instead? Explain the reason
I’ve encountered this problem too; is it necessary to use a high-pressure lens pad?
There’s no need. In the case of the Texaco gasification process, the maximum pressure class for flanges is CL1500; under such conditions, ring gaskets are generally sufficient ； For Shell, the highest flange pressure class is CL600; RF flange faces together with wound gaskets are sufficient. Lens gaskets are used on the high-pressure flanges in ammonia synthesis plants. With improvements in current ammonia synthesis processes, the synthesis pressure has decreased, and pressure ratings of PN320 are hardly needed anymore; as a result, lens gaskets are also used less frequently, and ring groove gaskets have taken their place. If lens gaskets are used, the flanges fitted to the valves must also be compatible, which makes them difficult to procure; therefore, lens gaskets are basically not used in current coal chemical gasification units.
Lens pads are suitable for high-pressure pipelines; your pressure is at most medium pressure, so there’s no need for them
Lens pads are suitable for high-pressure pipelines; your pressure is at most medium pressure, so there’s no need to use them.
I’ve never used a lens pad; I don’t know when it’s needed With what kind of flange is it used? ? ?