Its goal is to prevent leakage from, or into, the joined objects while under compression. Gaskets allow for less-than-perfect mating surfaces on machine parts. They can fill irregularities and increase the likelihood of sealability — especially in high-pressure applications and flanges that have a high differential temperature range cyclic flanges. There are many different types of gaskets used in the oil and gas petrochemical industry and other heavy industry.
Not the bolt load. Envelope Gaskets can be either double jacketed gaskets, or they can have PTFE some call it Teflon but that is a trademarked name on the outside of a stainless steel metal core.
These gaskets usually have a stainless steel core without any filler material, and are used in low criticality applications. Non-asbestos sheet material is typically found with full-face flanges and have elastomeric properties, although they can be just graphite gaskets in few cases.
Normally, these gaskets are used with low pressure and low temperature, but they can be also put in put in flanges where chemical resistance is needed. They come in oval or octagonal shapes, which can be used in API 6A applications.
RTJ gaskets were traditionally found in high pressure and high-temperature applications, as sheet material elastomers can not hold up in those types of applications. But today RTJ gaskets are being phased out of high pressure and high-temperature applications, as spiral wound gaskets with inner rings are now the preferred gasket. If you have a flange bolting project needing bolting tools or flange facing machines click here to get in touch.
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Search KB Delta. Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Home Forums Mechanical Engineers Activities Mechanical engineering general discussion Forum Gasket type and material in natural gas piping systems thread In a natural gas medium pressure aboveground piping system, what type and material of gaskets have others used between a cast iron valve flange and steel pipe flange with the raised portion machined down?
Has anyone successfully used a spiral wound metal gasket? I would get with your gasket supplier and see what in has for natural gas lines with Cast Iron Valves. There are quite a few materials for your application. I would not try to use a spiral wound gasket in your situation. Do you think there is some need for the spiral wound, ie fire?
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