anonymous wrote:
House built 1949. Wall hung urinal install 15-20 years ago by myself.
Two problems need fixing:

1 Urinal pipe seems to clog which I undersand is from a buildup of
something in the urine.

2 Sink downpipe is leaking badly so need to change that.

Both urinal and sink run separately into what I recall is a 3 or 4
inch cast iron downpipe at different directions but at the same level
on the down pipe. Both urinal and sink have separate piping and
traps and screw into separate female openings on the cast iron
downpipe.

The sink is an easy fix, just new fittings in black plastic piping.

Urinal I thought because of the potential for problems is to have a
horizontal takeout piece of plastic pipe I can unscrew at both ends
so I can easily clean it out and monitor any buildup if necessary. I
suppose ideally the urinal pipe should be running downhill to the
cast iron pipe but that is not possible so I had to go with a section
from urinal to wall of a horizonatal piece of pipe 6 to 8 inches
long. But having said that, commercially installed urinals appear no
different and have a horizontal distance to travel before leading
downhill!

If you any feedback thoughts for improvement, it would be much
appreciated. Thanks.

I know that all urinal pipes are prone to problems with buildup after
many years.

Can't you find some double-nasty cleaning stuff to pour down the drain?
Muriatic acid? Lye? Easy-Off?