For you plumbers out there. We're re-plumbing the grey water drain system in the 76 Sovereign
. The old system was quite convoluted and we think, think we can simplify it.
All the grey water drains are on the curb side along with the grey water tank. We have the galley sink, the shower pan, and the vanity sink. There are two vent stacks. One just after the galley sink, and one at the rear of the tub.
I would like to run one 1 1/2" ABS line from the galley sink drain to the tub. I would connect the vent pipes along the way giving the "drain manifold" plenty of air seems to me. All three basins have traps on their drain assemblies. I would dump all this wash water into the grey tank in two places. The grey tank would be vented through the drain manifold, not a dedicated vent line like the blank tank has.
Certainly my house has various sinks, toilets, tubs all draining to the septic tank. There isn't a separate drain pipe for each fixture.
The photo below shows a possible piping layout. Galley sink pipe is on top, and the tub drain is at the bottom if the photo. The vanity sink would drain from the photo right side. The grey tank is under the tub.
Is there a problem with this arrangement in the 76 Sovereign
that any of you have experience with?