Issues regarding the selection of gaskets between flanges of fluorinated pipe systems
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I would like to ask fellow sea enthusiasts: how should one choose gaskets for flanges on fluorinated plastic pipes? According to the specifications, PTFE-coated gaskets should be used, but in actual on-site installation it was found that such gaskets are very thin and prone to breaking. The method used for on-site installation is to employ metal wound gaskets with polytetrafluoroethylene wrapped around them manually; however, this approach has no established standards and requires a lot of labor. How does everyone do it?
There are many that are installed without gaskets; the fragile ones are probably due to insufficient thickness
Why can’t PTFE gaskets be used directly?
PTFE-coated gaskets are fragile; I’ve heard that for the first time. It’s true that they tend to deform after being installed multiple times. I agree with you – there is a problem with these gaskets
I’ve never seen any that were broken; unless exposed to intense sunlight, deformation is a common occurrence
He must be referring to raw tape; when wrapping a metal gasket, one should feel the sealant first and then apply the raw tape
I just checked – the gasket mentioned by the original poster is a composite gasket that uses soft gaskets such as asbestos rubber, asbestos-free boards, rubber, or graphite-reinforced sheets as the core, with a thin polytetrafluoroethylene sheet covering the outside. We haven’t used this type of gasket here, but during recent maintenance work, 200 meters of PTFE-lined pipes were installed, using PTFE gaskets with a thickness of 3 mm, and everything worked fine
May I ask what the actual pressure resistance is after fluorinated pipes are sealed together using polytetrafluoroethylene gaskets? Thank you!
I’m posting this again. What is the actual pressure resistance achievable when fluorinated pipes are sealed using polytetrafluoroethylene gaskets? Thank you! https://bbs.hcbbs.com/thread-3051086-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum Website)