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Jop,

This is for your information,

The Line Size is 3″,
Pipe Schedule is 10S,
Operating pressure is 200 Barg,
Operating Temperature is 37.5 Deg. C,
Installation country is Brazil,
Code B31.3,
This is a Flare Header of one module.
The valve Ratting is 300# and pipe is 150#.

gpsvn,

Thanks for your suggestion, I am also thinking like what you suggest,
I asked the qustion because to know the Difficulties of CS&SS welding.

One more.. i have one qustion, If i go through your suggestion..
The SS Flange (300#) Schedule is 40S (73mm I/D) and Pipe is Schedule 10S (83mm I/D), I faced this type of problem (missmatching Schedule) some times, I don’t know how to weld in fabrication shop, Just i followed the Piping Spec. Please Advise me….