#600 Flange onto a Sch 40 Pipeline
#600 Flange onto a Sch 40 Pipeline
(OP)
Is there any problem with installing a 4" ANSI B16.5 #600 flange onto a 4" API 5L ASTM A106 Sch 40 pipeline?
The working pressure of the system is 70 bar and as per the specs for Sch 40 and #600 this should be adequate. Please advise as I have never seen a #600 flange installed onto a Sch 40 pipe but cannot see there be any problems.
Just wanted some expert advice to make me feel a little more comfortable.
The working pressure of the system is 70 bar and as per the specs for Sch 40 and #600 this should be adequate. Please advise as I have never seen a #600 flange installed onto a Sch 40 pipe but cannot see there be any problems.
Just wanted some expert advice to make me feel a little more comfortable.





RE: #600 Flange onto a Sch 40 Pipeline
David
RE: #600 Flange onto a Sch 40 Pipeline
1.) the materials are weld compatible, meaning that the flange material should probably not have a grade higher than Y-52, or 52,000 yield strength, and
2.) the wall thicknesses of pipe and flange at the welding neck point do not vary by more than 3/16".
RE: #600 Flange onto a Sch 40 Pipeline
RE: #600 Flange onto a Sch 40 Pipeline
Hope it was taper bored for the weld.
I once saw a 30" flange on a 31" pipe (very high hydrotest pressure
RE: #600 Flange onto a Sch 40 Pipeline
I must ask, why did you buy pipe rated for 2000 psi only to operate it at 1000 psia?
Just wondering
RE: #600 Flange onto a Sch 40 Pipeline
I'll always remember it though. "Wow - THIS is different..." :)
RE: #600 Flange onto a Sch 40 Pipeline
rmw
RE: #600 Flange onto a Sch 40 Pipeline
RE: #600 Flange onto a Sch 40 Pipeline
The easy "out" for Leinster's situation is to have the fab welder use a Slip-On flange. Otherwise, you have to choose between ordering a 600# Weld-Neck counterbored to Sch40, or forcing the fitter & welder to grind for 4 to 8 hours to achieve the required 3:1 ID taper. Neither are cheap options.
BTW, 600# steam belongs inside Sch80 pipe. The generous Corrosion Allowance is needed, unless the operatior ALWAYS perform a proper Wet-Layup to prevent corrosion [never happen]
RE: #600 Flange onto a Sch 40 Pipeline