This is for buried potable (domestic) water. Actually, I've been trying to talk to manufacturers this morning and finally reached someone at Harvel who told me that SDR 21 fittings are not made and that using the Schedule 40 for 3" fittings would work (based on pressure capacity).
However, I...
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...
