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Old 08-07-2012, 07:11 PM   #1
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1954 22' Flying Cloud
Vista , California
Join Date: May 2012
Posts: 108
Images: 5
Holding tank vents / drains...

I am installing a shower, toilet and sink into a 54 flying cloud. I'm having a bit of trouble designing a holding tank system. I have drawn a floorplan including the framing beams and have ordered a gray water tank and black water tank. (god I hope I had them put the holes in the right place.) I'm trying to visualize how I will vent the two tanks, routing the drains and only ending up with one vent through the roof. One of the problems is that my shell is off and is in another location so I'm designing without exact window locations and need to place the walls, etc. Any help will be appreciated. Thanks, PLEASE HELP!

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Old 08-07-2012, 08:16 PM   #2
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1968 24' Tradewind
Oxford, , Mississippi
Join Date: May 2009
Posts: 1,307
My 68 24 foot Trade Wind has 3 vents. One for the kitchen sink, one for the shower which are on the street side and one for the black tank and lavatory on the curb side. If all of your fittings are on one side of the trailer, you might make one vent work but you must have proper venting for the plumbing to drain properly.

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Old 08-07-2012, 09:25 PM   #3
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1954 22' Safari
Little Compton , Rhode Island
Join Date: Jul 2012
Posts: 34
Facing similar dilema

My 1954 Safari was missing the tiny galvanized black water tank located directly under toilet, (never had a gray tank) when I purchased it a month ago. There was a vent pipe, made of some kind of super light plastic, originating from the side of the flushing pedestal that the ceramic toilet sets on and running up the outer corner of the bathroom wall to vent thru the roof.
I know what you mean about the confusion locating inlet and outlets on the black water tank. I purchased a 25 gal tank, rectangular tank which has an outlet below an overhanging, upper portion of the tank. This overhang allowed me to position the tank perpendicular to the trailer so that it drains on the driver's side and doesn't protrude out past the shell. I will have to modify the belly skin to accomodate support straps/framework but I was lucky (?) since this section had been removed at some time and reinstalled.
At this time, I am considering using a tote along for gray water, when I absolutely have to. Since gray water isn't hazardous, to the best of my knowledge, I will just drain it to the ground when conditions permit.
Please keep posting your progress and ideas. I will do so, too.
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Old 08-07-2012, 09:41 PM   #4
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1954 22' Flying Cloud
Vista , California
Join Date: May 2012
Posts: 108
Images: 5
Since the gray and black water tanks are both inside the longitudinal (main lengthwise framing members, the shower will drain directly into the gray tank. the two sinks, kitchen and lav, will drain into the vent pipe and into the gray tank, getting its venting from the shower drain. The toilet will drain directly into the black tank and needs a vent also. I was hoping to route the vent into the gray water vent somehow so that I only need one hole in the roof. I'll lose some sleep tonight sorting all of this out.
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Old 08-07-2012, 09:58 PM   #5
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1957 22' Caravanner
Port Hadlock , Washington
Join Date: Dec 2008
Posts: 861
Originally Posted by 54breadloaf View Post
the shower will drain directly into the gray tank. the two sinks, kitchen and lav, will drain into the vent pipe and into the gray tank, getting its venting from the shower drain.
If I'm reading this right, the plan is to use the shower drain as the gray vent? Venting inside will fill your trailer with gray tank odors. I understand the desire to limit the holes in the roof, but function here is really important. 50's trailers often used a very low profile vent cover that is hardly noticeable. Should be some pics of that in my thread and also in nmbosa's thread as well.

Following toastie's lead, I used the Hepvo valve to eliminate the need for a P trap and vent in the galley sink and it has worked really well for a year of fulltime use. You could use it in the shower as well (wish I had).

Forum Thread: First She Had to Take a Ride on a Boat

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Old 08-07-2012, 10:56 PM   #6
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1968 28' Ambassador
Cedaredge , Colorado
Join Date: Jul 2008
Posts: 2,542
If they all go into the same grey tank there is only need for one vent. I redid all mine. My shower and bathroom sink go into the same tank but through different holes. So the shower vents up through the sink vent. the black tank also vents through this system. Now my shower was on it's own system and had a vent so it is still there, but not needed. My front kitchen sink drains into another grey tank that is connected into the other grey tank with one pipe between the two. This self levels the two tanks. The kitchen sink has it 's own vent pipe also.


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