Shower drain pipe

[David A. Andersen]

What is that 3/4 line from?

Hope it's not from the HVAC unit...

[Marcel Gratton]

Originally Posted by belliott

Minimum permissible horizontal run would be 3 inches , as it must be double the diameter of the trap size.

1 1/4" is normal for a bath sink ,but I believe the shower drain here is 1 1/2" , unless you are saying the trap is a 1" dia pipe that I have never seen on a plumbing drain before.

Hi Bob,

My understanding of a pipe maximum run is based on slope of pipe which should be 1/4 inch per foot.

e.g. for a 1.25 inch pipe, maximum run would be 5 feet (1.25 / .25) without a vent, 1.5 inch pipe, 6 feet, for a 2 inch pipe, maximum run would be 8 feet, etc.

I haven't heard of minimum run but it makes sense.

[David C. Macy]

Originally Posted by dandersen

What is that 3/4 line from?

Hope it's not from the HVAC unit...

Yes that is the condensate. This home had an interior drainage system installed in this corner of the basement. I figure it had an open drain and when they installed the sump and basement system the installed a fixed, sealed drain.

My assumption is the basement system installer is not a qualified plumber.