Are push-on and mechanical joints rated for the same pressure as pipe fitting or higher?
Ductile Iron push-on and mechanical joints are covered in AWWA/ANSI C111/A21.11 “Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings.” Section 4.2.2 of that standard states: “The mechanical and push-on joints shall have the same pressure rating as the pipe or fitting of which they are a part.” In other words, if the pipe fitting is rated for 150 psi working pressure plus 100 psi surge (250 psi), so is the joint. If the pipe fittings is rated for 350 psi working pressure plus 100 psi surge (450 psi), so is the joint.
