Cutting plastic sewer pipe below a concrete slab

[JIMMIE]

I dont think the toilet flange was installed right. Shouldnt the flange be on the concrete instead of on top of the ceramic tile???

[Oren]

Oops

[Red Green]

Dean Hoffman wrote in news:hkl5n3$hps$1 @speranza.aioe.org:

Disclainer: I'm no plumber nor very experienced at it.

Would the lip set the stage for clogging????

The pipe for a toilet is 3" sched 40? If this is true, I found some chart that says the internal diameter is 3.068.

Sched 40 wall thickness is about 1/4" (.216 according to the table) I take it. If you put an internal coupling (assume it's sched 40 like the pipe?) then the drain reduces a half inch at the coupling. Roughly, diameter is reduced 16% the internal flow area is reduced from 7.39 sq in to 5.18 sq in. or 30%.

Maybe couplings for schd 40 are thinner wall than the pipe?

[Dean Hoffman]

Beats me. I just know they exist. My plumbing experience is limited to the few things I've had to repair for myself.