For pipes and valves with a steel lining covered in PTFE, what type of gasket should be used? RF or FF, thank you
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For pipes and valves with a steel lining covered in PTFE, what type of gasket should be used? RF or FF, thank you
The gasket type is determined based on the flange sealing type
I remember there used to be an opinion that if the flange surface of the lining had a flange, gaskets weren’t actually necessary
PTFE’s? I don’t know about pressure and temperature
It should be like this: PTFE itself serves as a gasket, but I’ve also seen gaskets being used on the RF side
Yes, tetrafluorine itself can be used as a gasket material
Thank you all for your answers. Can the flanges for steel-lined PTFE pipes be of the RF type? In that case, RF gaskets should be used; if they are of the FF type, then FF gaskets should be chosen
FF is the best choice; of course, RF manufacturers can also do it
We use FF; since the pressure in these pipes is not high, a planar seal is sufficient. Some even level out part of the surface, so gaskets are not necessary.