Selection of flange facing 1

[SukhpalSingh]

My question is that according which standard I can choose the valve flange facing (Raised Face (RF), Full Face (FF), Ring Joint (RTJ), Male and Female (M&F) or Tongue & Groove ). Noting that I have the values of operation temperature and pressure.
Thanks

 

[Dhurjati Sen]

Dear Sukhpal,

Start with ASME B 16.34

DHURJATI SEN

 

[roca]

...and the project or Client piping/valve class specs and datasheets. These (should) provide all details and required flange facings.
Normally 900# and above are RTJ, less than 900# = RF. This can differ though from Cient to Client.

 

[mk3223]

The design of the flanges type may be based on the process fluid, operation press & temp, etc.
IMO, FF flange is typical for the CI/DI material. M&F and T&G for the steel flanges may be replaced with RF or RTJ flanges.

 

[LittleInch]

Is your question which one should I choose?

That's up to you based on custom and practice, pressure, temperature and fluid type.

I've never seen a M/F or T/G flange in 30 years of working around hydrocarbon systems, but they seem to exist in certain niche areas. Clearly you need to make sure you buy them in pairs and use the right gaskets.

See this discussion

http://www.eng-tips.com/viewthread.cfm?qid=191786

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