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Old 02-04-2009, 07:44 AM   #1
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tank vent out the side?

I have a dilemma. I am finishing the renovation of my 55 Holiday. It's been an every screw, nut and bolt renovation with the only changes visible being where I couldn't get the original floor tiles and counter top formica. I have added some improvements that aren't visible like grounded wiring and small gray water holding tank. I am making once concession to keeping the visible part original by adding a small 8 gal black water holding tank under the toilet. Didn't have one at all.

The tank is roughly 40" x 16," 5 3/4 on the deepest end and 3" on the part beneath the toilet.
Venting is the problem.
There really isn't a good way to run a vent stack without having the pipe sitting out in plain view.

My Casita camper vents the tank through the side. I could easily run a vent from the top of the tank on the deep end up through the front seat and then out the side. The interior wall next to the toilet is one layer of 1/4" plywood.
I can't find any information on side venting. I assume since Casita does it, it must be acceptable?
I know a roof stack would be the best way to go but I just can't figure out an unobtrusive way to do it? Suggestions?
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Old 02-04-2009, 08:17 AM   #2
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I also have a Casita and my tank vent first goes into the closet, and then out the roof. Give that a thought.
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Old 02-04-2009, 08:18 AM   #3
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I don't think there's a technical reason not to have a side vent. There may be esthetic and aromatic reasons.

I'd pitch the horizontal run at least 1/2 inch per foot to insure drainage when on uneven terrain.
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Old 02-04-2009, 09:20 AM   #4
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Just a thought here, The vent is mainly only for the dump function of the tank, yes or no? Could you eliminate the vent if you opened the toilet flush valve when the time came to dump the tank?
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Old 02-04-2009, 09:34 AM   #5
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I also have a Casita and my tank vent first goes into the closet, and then out the roof. Give that a thought.
Went and looked at the Casita, and I was wrong....it has two vents and the one from the toilet goes straight out the top.
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Old 02-04-2009, 09:40 AM   #6
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Just a thought here, The vent is mainly only for the dump function of the tank, yes or no? Could you eliminate the vent if you opened the toilet flush valve when the time came to dump the tank?
I'm no mechanical engineer and I'm not an expert in fluid dynamics, but I do know that there are gases associated with the ...err.. contents of a black tank. And I think those gases MIGHT be lighter than air. So without a vent, those gases are probably going to seek the only point of exit they have, which is the not-entirely-airtight seal of the valve between the toilet and the tank, and come up into the interior of the trailer.

I can't imagine there's any physical reason not to use a side vent, but since it appears your toilet is right next to the door at the front end of the trailer, I might consider a front vent instead, to keep any potential odors from migrating in through your door or over to your patio lounge area.

Just my $0.02, and I love your Holiday, keep up the great work!

-Marcus
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Old 02-04-2009, 09:46 AM   #7
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lwebb, The stack vent for all black water tanks has two functions. Just like your home vent it allows makeup air to help with flushing and also to (vent) and (prevent) build up of methane gases. The reason to roof vent is mostly for aroma control as stated above but a plumbing specialist may say that the volume of air in the vent is also important. Just some things you might want to consider. Maybe this is a good time to Ask A Plumber! Hope this helps... Happy Trails, Ed
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Old 02-04-2009, 09:46 AM   #8
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side vents

I went to the EBAY boat parts site. There I found lots of great looking and sized vents. I got small stainless vents for the fresh water tank and the gray tank and placed them on the side of the trailer. The vents even have stainless screening.
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Old 02-04-2009, 10:03 AM   #9
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Hey all, thanks for the fast replies. My Casita is a 16' and the toilet sits on the 6 gal holding tank as a base. The tank just vents straight out the side behind the toilet. I've never had a problem with odor? It's on the street side.
As to my side vent, I was planning on going to the opposite side away from the front door. The tank will go underneath across the front, set back of course, so I can tap into the top of it under the bench seat then outside that side.
I think that the vent is necessary to let gasses escape. If there is no vent, the odor and gasses will come up through the toilet. There isn't a PTrap or room for one. The tank also needs a vent so when you flush it won't dead head, or as you flush, the gasses in the tank will come directly up into the bathroom to make room in the tank for the new fluids etc.

Hey thanks for the comments on the Holiday. A labor of love since 05. Here is another picture of the rear. It looks huge but the cabin is actually only 12"
I have a site that shows early progress. It's woefully out of date and some of the links are buggy, but if interested, take a look. lwebb.myweb.uga.edu
Thanks
Lanny
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