I am in the process of rebuilding the bathroom. I have removed the black water tank and plan to replace it. I want to add a grey water tank as well.
For those not familiar with this year/model:
The black water tank sits on top of the floor. The toilet sits on top of the tank. The bathroom floor doubles as the shower tub. Originally the shower discharged onto the ground. The kitchen sink drained into the black tank via the vent tube that ran up through the roof.
In my particular model, the kitchen and the bathroom are separated by a thin wall. The black water tank does run a little under this wall almost into the kitchen. Directly next to this wall in the kitchen is the stove and refrigerator, stacked. Below the fridge is a drawer, right above the floor. My plan as drawn below is to have a grey water tank in the place of this drawer, which empties via a discharge valve into the black tank. The location of the valve would be accessible through lifting the exterior hatch directly behind it. The vent for the grey tank would be created by rejoining with the black tank vent tube.
But this complicates where to place the drain for the shower to hook up to grey tank. The drain for the shower pan is lower than both black tank and proposed grey tank. When I received this trailer, the shower drain was piped with an elbow into the old Sani-Ware discharge assembly. The only way that designed worked was if the dump hose was attached, then it drained directly into the hose unchecked. I didn't like the way it looked because it hung precariously below the belly pan.
Your thoughts? On grey tank idea, ways to hook up shower pan to grey/black, etc.
The secret is finding a way to vent the new tank and you have.
I would just let the shower continue to go into the black.
Dump the black first and then flush it with the gray and you have a good system.
Some might say you are not within code on the vent but if I told you the reasoning behind vent codes you would laugh.
You have satisfied the laws of physics.
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The Caravel has a similar layout, and I have thought of adding a grey tank for the sinks to empty into, but I would leave the shower just draining to ground. In 11 years I think we have used it a handful of times, there is almost always a better showering alternative available at the campground but that's just us.
Having the grey tank, or a bigger black tank (or BOTH), would be a really nice addition!
Routing shower into black tank kind of defeats the purpose, no? One or two showers and your tank wil be full...
True. It is a concern. So I think the best way would be to elbow it back into the discharge assembly. Unfortunately that means either the dump hose has to be installed and run into sewer, or carry a blue tank with us if we are going to be somewhere where camp showers and hookups are not available. But that's okay, it's do-able.
Below is a drainage diagram and a possible assembly that may do the trick.
Are you sure there might not have been a modification or two before you got the trailer? My 61 Tradewind is plumbed (original) like you last example. Valve on the bottom of the black tank and all the gray water plumbing connects to the valve assembly. Yes, you have to keep the discharge hose hooked up and the gray goes into the RV park hook up or a tote. None should drain into the black tank. I contemplated putting in a gray tank, and still may, but the set up works just fine in 90% of cases.
I don't think any mods were done to the kitchen drain system. The kitchen sink drained directly into the vent pipe that entered the black water tank. The shower drain however did have an install that did not look original - a white pea trap pipe that drained into the lower half of the black tank discharge assembly similar to my last drawing.
I don't know if tanks will fit underneath between the floor rails without having to advance the tanks forward toward center, which complicates the issue. Just not a lot of space in the belly of a Bambi. Maybe someone who has modified an old Bambi this way can chime in?
The kitchen sink drained into a pipe that ran underneath the belly pan, and coursed over to the discharge assembly where it joined up with shower drain before entering discharge below the black water valve. I just didn't see the drain pipe in belly pan before, so apparently there were some (bad) mods done by previous owners/family members.
With this new plan, the grey water valve will only be for discharging the grey tank, though. Otherwise the water from kitchen would back up into the shower pan if the valve operates downstream from both shower and kitchen. Plus, the tank building guys had heebie jeebies about black and grey tanks being so intimate in the previous drawing.
So that still leaves me having a shower drain that is unchecked in the discharge assembly, but do-able with just two of us. Unless you have a different idea on how the shower can join up with kitchen pipe without back flow?
My '74 Argosy 26' has a (small) 12 gallon grey tank. I didn't want to tear the floor or belly pan out. As an alternative. I installed a 21 gallon tank under the curb side twin bed. When the original tank gets full. I pump it into the new tank. The 21 gallon tank drain is connected to the sewer line for the galley sink.
It saves me the hassle of dealing with a tote.
When both tanks are full. I empty the 12 gallon tank first then open the dump valve on the 21 gallon tank. It drains into the 12 gallon tank. Since the 12 gallon tank dump valve is open the grey water runs thru and out.
A friend of mine with a '60's A$ simply put a pump in the shower drain. Which pumps the grey water into a 21 gallon tank above the floor in his coach. He just turns the pump on when showering.
Since you have solved the grey water tank drain issue. Running a line from the shower drain to the grey water tank. The pump idea may work for you.
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The air vent, plumbing stack, vent stack... whatever you want to call it, tied in somewhere around the dump assembly. How? And why?
The original discharge assembly has a hole where (I assumed) the shower used to tie in. But is this actually where the air vent tied in and shower emptied on ground as described in many vintage AS posts? When I received this trailer, a mod was made to allow shower to tie into discharge assembly. It was obviously a mod ( white pipe, p trap, different gauge). The original discharge assembly has another hole opposite of this one where kitchen drain tied in.
I drew a diagram of the plumbing stack as I see it right now:
Do I need to reattach the bottom of the stack to the new discharge assembly, or is this optional?