SDR 21 Pipe with Sch. 40 fittings?
SDR 21 Pipe with Sch. 40 fittings?
(OP)
I received a submittal from a contractor for the domestic water system I designed on a project. I have specified 3" SDR 21 pipe per state requirements for PVC water distribution pipe under 4 inches. They have submitted PVC schedule 40 fittings for this pipe. Is this appropriate? I know that SDR 21 has a maximum of 200 psi and 3" Sch. 40 has a max of 260 psi so, intuitively, it should work, but are there SDR 21 fittings available and should they be used?





RE: SDR 21 Pipe with Sch. 40 fittings?
PVC SDR 21 has rubber gasketed bell and spigot flexible joints and is used for buried appliactions. For pipe larger than 1 -1/2" sise, bell and spigots joints are generally preferred.
PVC Sch 40 piping is solvent welded and not typically used for underground applications.
Additional information on the pipe:
http://www
RE: SDR 21 Pipe with Sch. 40 fittings?
However, I just turned the page in the Std. Specs and found: "All couplings installed underground to connect ductile iron or PVC pipe shall be manufactured of ductile iron". There's my answer.
Thanks for your help - ended up answering my own question.
RE: SDR 21 Pipe with Sch. 40 fittings?
RE: SDR 21 Pipe with Sch. 40 fittings?