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Low Flow in Pipes- posted in Ankur's blog

Wnrf Vs Rtj

Started by manchester, Feb 12 2010 05:42 AM

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#1 manchester

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64 posts

Posted 12 February 2010 - 05:42 AM

Dear Masters..,

I am studying of how to build a P&ID.
I've noticed that in vessel nozzle, Weld Neck Raised Face (wnrf) is always use for rating <900#, meanwhile RTJ is used for rating >900#.

Can somebody help me to find the answer of why? Thanks a lot.

#2 fallah

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4,954 posts

Posted 12 February 2010 - 02:29 PM

Dear Masters..,

I am studying of how to build a P&ID.
I've noticed that in vessel nozzle, Weld Neck Raised Face (wnrf) is always use for rating <900#, meanwhile RTJ is used for rating >900#.

Can somebody help me to find the answer of why? Thanks a lot.

As far as i know,in PID development it is usually no need to specify the flange facing.

Normally flat face flange is used in water industry,raised face class 150#,300#,600# in oil and gas industry,and RTJ class 900# and more in oil and gas industry.

Using RTJ flange in class 900# and more relates to higher reliability of these type against leakage in high pressure service.