Welding 12 sch 40 pipe with 12 sch 20 WN flange
Welding 12 sch 40 pipe with 12 sch 20 WN flange
(OP)
Hi Everyone..!
Due to mistake of procurement we have 12" 300# Sch20 flanges delivered at site instead of required 12" 300# Sch40 flanges.
Is it permissible to trim the pipe ends for weldability..?
Line conditions are
Oper. Press.: 24.53 Kg/cm2 g
Design Press.: 48 Kg/cm2 g
Oper. Temp.: 45 C
Design Temp.: 87 C
Due to mistake of procurement we have 12" 300# Sch20 flanges delivered at site instead of required 12" 300# Sch40 flanges.
Is it permissible to trim the pipe ends for weldability..?
Line conditions are
Oper. Press.: 24.53 Kg/cm2 g
Design Press.: 48 Kg/cm2 g
Oper. Temp.: 45 C
Design Temp.: 87 C





RE: Welding 12 sch 40 pipe with 12 sch 20 WN flange
I would dump it, and sack the buyer.
Who would want 300# sch 20 in the first place ??? Sack the supplier too.
RE: Welding 12 sch 40 pipe with 12 sch 20 WN flange
RE: Welding 12 sch 40 pipe with 12 sch 20 WN flange
Verify that and you will be able to counter bore the pipe to match the sch 20, if you are using B31.4 or B31.8 and your design factor is 0.5 or higher. But you can't do it if the Design factor is 0.4
What would you be doing, if you knew that you could not fail?
RE: Welding 12 sch 40 pipe with 12 sch 20 WN flange
RE: Welding 12 sch 40 pipe with 12 sch 20 WN flange
I understand Sch40 pipe bore can be trimmed to suit Sch20 flange.
My concern is these flanges are to be installed at pump discharge. Should I take the risk of installing Sch20 flanges or not..??
RE: Welding 12 sch 40 pipe with 12 sch 20 WN flange
What would you be doing, if you knew that you could not fail?