Welding procedures can be downloaded from AWS web site, go to publications look for procedures starting with letter "B" (B2.1-1-16 is the procedure for SMAW) these are pre-qualified procedures.
Check valves in raw sewage is tough, Our crew has installed check valves of all sorts in differant waste water applications. First, the check valve in question must have a stainless steel seat, it's been our experiance that brass seats (or other soft metals, bronze) get beat up when the city...
As per UPC code, all piping shall be installed so that there is no strees on fittings or the pipe itself, UPC also has a detailed pipe hanger spacing spec...If you adjust your pipe springs before piping is used (filled) so that their is no stress on joints and pipe, when the system is charges...
surface contact is going to be minimal with the unistrut, B-Line offers a variety of options for weight transfer. 24" dictile pipe with fluid is going to be heavy, I installed a fire line in a tunnel that was supported by unistrut racks. They were 6' on center and we used "double backed strut"...
Try a 10"x10"x10" tee with what ever lenth of 10" you can get on the brach outlet before you have to reduce it (10"x6" con. red) SLOW THE FLOW through the fitting. just food for thought....
I run pressure tests weekly (some time daily) on a variety of differant systems, I'll tell ya from experiance, I run with pnumatic tests at a lower pressure before I move on to full pressure hydrostatic tests. For a typical 150-300 PSI system that requires a hydrostatic test of 1.5 working...
