Sch 40 vs Sch 80
Sch 40 vs Sch 80
(OP)
Can you mix Sch 40 and Sch 80 pipe/fittings? For example I am having a hard time finding 3/4" Sch 40 API 5L FBE Seamless pipe, but I can find Sch 80, Is it okay to upgrade to Sch 80 and intermix with Sch 40, or will the fittings and pipe not connect properly?





RE: Sch 40 vs Sch 80
RE: Sch 40 vs Sch 80
Sometimes its possible to do all the right things and still get bad results
RE: Sch 40 vs Sch 80
RE: Sch 40 vs Sch 80
If you are socket welding, which would make the most sense at 3/4" NPS in most services, then the pipe wall doesn't matter - assuming the lighter wall is adequately strong for the service.
RE: Sch 40 vs Sch 80
You can replace a light weight (thinner wall) pipe like Sch40 with its heavier-walled same-dia Sch80, same material for most welded fittings - butt weld prep's need to be addressed as mentioned above.
BUT! Flanges are different: You can generally use a heavier-walled pipe within a pipeline or a pipe run (make sure you update the as-built configuration record appropriately for that section) if the specified flanges mounted outside the pipe remain the same. You CANNOT arbitrarily replace lower-rated flanges with heavier-rated (higher-rated) flanges since the bolt holes, gaskets, bolt lengths and diameters, and flange faces will then differ.
RE: Sch 40 vs Sch 80
Sometimes its possible to do all the right things and still get bad results
RE: Sch 40 vs Sch 80
RE: Sch 40 vs Sch 80
RE: Sch 40 vs Sch 80