Hot Water Heater TP valve drain pipe

[Manzoor Husain]

Hi, This is Manzoor
I have recently seen that in new homes they are using a flexible copper pipe in the drain line of the TP valve. I had always thought that this pipe has to be solid copper, steel or cpvc. Has any one else experieced this ? Is it code compliant to use flexible pipe?

[Rick Hurst]

Those flex type copper lines are reduced and not 3/4in. inside diameter as required.

Therefore they are not acceptable.

Rick

[Jerry McCarthy]

Ditto Rick. Refer IRC 2006 P2803.1(3)

[Manzoor Husain]

Thank you for pointing out the reduction in the diameter of the pipe.I am surprised that the code inspectors don't consider this a problem.