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Old 10-02-2010, 12:17 PM   #1
Confused in Bham
 
1964 24' Tradewind
Bellingham , Washington
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Grey Tank Venting - new location, and angle

So I've got the three tanks installed under the new floor of my '64 Tradewind 24'. The Grey tank found its way in to the floor just behind the door and in front of the axle. It had to go there as the black had to go behind the axle where the toilet is (potable is in the very back as original).

Problem: I need to vent the grey tank, but since is in the 'living' area of the trailer, I don't have alot of options to where the piping comes out and travels its way to the ceiling (without having it in the middle of the room. Can someone tell me the maximum angle the vent pipe can be at while still able to vent? I would like to go at least 45 if not 60 degrees to get it to the wall asap, and then may have it go out the refrigerator vent. Thoughts?

Thanks
Beyond
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Old 10-02-2010, 12:20 PM   #2
Confused in Bham
 
1964 24' Tradewind
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Picture of tank locations

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Old 10-02-2010, 12:44 PM   #3
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a vent provides air to fill the vacuum created by the liquid leaving the tank. that air will move through twists and turns easily. you can angle it without worry. just get through the roof or use a STUDOR Air Admittance Valves and ventilation systems for the plumbing industry - AAV.

although i've never seen an air admittance valve used it a camper....

don
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Old 10-02-2010, 12:46 PM   #4
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Looks like your tank extends under the[ floor to ceiling space] beside refrigerator,can you bring it up there in that area,a 45 degree ell is considered a vertical,after being 6" above kitchen sink you can go to a 90 ell,this is the National Plumbing Code for buildings,on a gray water tank,I would think as long as you are above the floor you could 90 to the back of the cabinet,it`s not like you are going to have a plumbing inspector look and make a new roof penetration. Dave
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Old 10-02-2010, 12:48 PM   #5
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Aaav

Quote:
Originally Posted by alclad View Post
a vent provides air to fill the vacuum created by the liquid leaving the tank. that air will move through twists and turns easily. you can angle it without worry. just get through the roof or use a STUDOR Air Admittance Valves and ventilation systems for the plumbing industry - AAV.

although i've never seen an air admittance valve used it a camper....

don
An automatic air admittance valve will not work,the valve allows air to enter,however it will not let air escape as the tank is filling. Dave
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Old 10-02-2010, 12:57 PM   #6
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An automatic air admittance valve will not work,the valve allows air to enter,however it will not let air escape as the tank is filling. Dave

exactly correct. i was only thinking of the air in part...
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Old 10-02-2010, 06:35 PM   #7
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I have the same arrangement in my '59 Tradewind. I ran vents from both outside corners. The curbside runs up through the pantry and the streetside runs under the stove to the wall, then up inside the wall to the roof.

It works great, and an advantage of having a vent on each side is the tank vents nicely regardless of which side is high or low.
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Old 10-02-2010, 07:41 PM   #8
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In one our previous sob trailers (Jayco I think), the gray tank had a roof vent on the bath side of the trailer. The galley area, which was on the other side of the trailer, had an air admittance valve installed in the cabinet under the sink. So they can be used in an RV, but not as the only vent for a tank.

I'm with Dave - go up inside the floor to ceiling area you show in your floor plan with a vent pipe.

Chris
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Old 10-15-2010, 10:57 AM   #9
Confused in Bham
 
1964 24' Tradewind
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Hi All,
Thanks for the advice. Attached is what I finally pulled off. Feel free to let me know if you have concerns of what I did.
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Old 10-15-2010, 04:41 PM   #10
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Looks great to me!
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Old 10-15-2010, 06:00 PM   #11
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clever

Genius! I didn't think to place all tanks in the belly. Well crafted. Must open up a good deal of cubic space within the trailer.

Your photos with the tools everywhere reminds me of my own endeavors this past summer. Ahh, the pleasure and pain those memories bring.
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Old 10-15-2010, 07:07 PM   #12
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Remember that the boat guys deal with even more cramped spaces; there are some nice flexible hoses designed for carrying water, etc. that can make running vent lines much easier in tight spaces.

- Bart
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Old 10-17-2010, 03:07 PM   #13
Confused in Bham
 
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Thanks Bart, Good idea.
I've got another challenge that a boat idea might help with. The grey tank is as shown but the shower is in the back (forward of the bed). Thoughts on how to get the drain water to the grey tank? I don't think I can raise enough for a gravity feed.
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Old 10-18-2010, 12:24 AM   #14
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Thanks Bart, Good idea.
I've got another challenge that a boat idea might help with. The grey tank is as shown but the shower is in the back (forward of the bed). Thoughts on how to get the drain water to the grey tank? I don't think I can raise enough for a gravity feed.
This is also a common problem in boats, since showers are often below the water line ...

Here's an interesting article.... note that you can easily fit a marine bilge or shower pump in the belly pan of the trailer... these will easily pump into your gray water tank. Pumping gray water is pretty easy; about the only problems you run into is hair; a mesh screen will help. Modern bilge pumps are readily cleaned, particularly those using a cartridge type system that permits motor and impeller removal w/o disturbing any plumbing connections.

- Bart
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