welding 2 different thickness of pipes
welding 2 different thickness of pipes
(OP)
Trying to find out the proper way of welding two pipes of different thickness, carbon steel sch. 40 and sch 120 or is it even possible to do such. Anyone please.
RE: welding 2 different thickness of pipes
RE: welding 2 different thickness of pipes
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RE: welding 2 different thickness of pipes
1) taper bore at an angle or range of angles specified by the code or standards or
2) backwelding so that the weld metal depositied on the pipe ID provides the smooth transition from thick to thin pipe or
3) transition fittings (short piece of pipe of intermediate thickness) with thickness selected so that the change in thickness at the weld joint on either end of the transition fitting is within the allowable thickness difference specified by the code or std. or
4) some combintation of the above.
RE: welding 2 different thickness of pipes
I would ask myself "why are the pipes of different thickness?" and "Is the thinner pipe adequate for the pressure?" before consideration of welding them together. Are the materials of each pipe the same needs to be considered also.
RE: welding 2 different thickness of pipes
This is for a condensate line with a TLR, problem occurs every now and then I decide to do something instead of just doing a repair evrytime. Existing pipe size is 6' that branch in a tee to 4" in sch 40 pipe. Replacing piping in the affected area extra strong to a sch 120 pipe hoping at least it'll last 5 year before another reapir will be done.
RE: welding 2 different thickness of pipes
To follow up along the vein of DSB123's question, why is the failure/problem occuring? Is it a velocity issue? Corrosion, erosion, etc?
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: welding 2 different thickness of pipes
It is a velocity issue.
RE: welding 2 different thickness of pipes
S.
http://www.corrosionist.com
RE: welding 2 different thickness of pipes
As strider6 mentions, it could be due to erosion or eronsion-corrosion which is accelerated by high fluid velocities, presence of sand or other particles, corrosive contaminants such as C02 and H2S, high wall shear stresses.
We don't know what type of flow you have nor of the product flowing, but you probably should look at developing an optimum velocity for the system.
I know this has gotten away from the original question. There have been some good discussions on velocity thresholds in the some of the other forums, you might want to check out some of them.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com