On Jul 29, 1:08 pm, pakdog wrote:
This is a remodel issue. Want to run a drain pipe in the crawl
space from a laundry room sink and it will need to be level for
about 18" just before it hits the sanitary tee that leads to the
waste line. The reason is there is a dryer vent in the way. I'm
concerned about how well that section of pipe will drain.

Kevin

Perfectly level? As long as there's_some_fall (and the pipe doesn't
sag), you'll most likely be fine. The dryer vent could possibly be
indented slightly to create some fall in the drain if it causes any
negative slope. Will the washing machine drain into this sink? Sheer
volume of water may be an issue then. HTH. Tom