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Old 03-12-2012, 04:57 PM   #1
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1971 18' Caravel
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Gray water tank installation

I am adding a 20 gallon grey water tank to my 71 caravel and could use ventalition advise. The tank is 5 inches high and maxes out the sub frame dimension. I was thinking of positioning the tank so that a hole thru the closet space next to the toilet would allow a pipe from the top of the tank to plum into the toilet vent. Is there a more practical way?
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Old 03-12-2012, 05:02 PM   #2
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That is what you need to do. You can also use the vent that goes through the wall at your sink. The vent in the top can also be the feed to the tank. Does that make sense?
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Old 03-12-2012, 06:56 PM   #3
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I see what your saying, that is vent along the feed line to the tank - better still.
Any ideas as to the best way to valve the grey water tank ?I have seen a two in one valve that is 3" for the black water tank and 1.5" for the grey water but not sure if it is the way to go. What is the appropriate way?
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Old 03-12-2012, 07:08 PM   #4
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Yes, that is exactly what we do. You can run the 1.5" in the frame as low as possible. If you burn a hole through a cross member, be sure to reenforce it to compensate for the missing mass.
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Old 03-12-2012, 07:22 PM   #5
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How about a quick photo? The 90 degree elbow goes thru the floor, directly into the top of the tank. The upper line is the vent, goes thru the roof. The lower of the two pipes that dissappear under the tub goes to the tub P trap, the upper one goes to the sink.

All of the stuff you see is hidden in a closet

This is in my '63 overlander, I'm done a full shell-off and part of it included adding a gray tank
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Old 03-12-2012, 07:54 PM   #6
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Here's another venting picture. The black ABS pipe on the wall is our vent line. On the left is where the vent goes inside the wall and exits through the roof. This was the original vent for the kitchen sink in or trailer. If you follow that towards the rear of the trailer, the first tee goes down to vent the two gray tanks we added. The vent line continues on the inner skin to the rear through the bathroom wall, and then drops to vent the black water tank. We're using the single roof opening to vent all 3 tanks. The other black pipe on the floor is the drain from the bathroom tub/shower and sink.

If you join the vent of the gray tank with the black tank, just be sure to join it high enough to help ensure that you don't end up with any black water overflow going into your gray tank. Our vent on the wall is above the level of the toilet bowl. So, if the black tank was full, we'd have it backed up into the toilet before it overflowed into the gray tank.

Chris
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Old 07-28-2012, 07:22 AM   #7
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Great photos! Has anyone used flexible hosing for the venting pipes instead of pvc or black abs pipe? IF so, what did you use? I would imagine there would be some flexible bilge pump or vinyl tubing that would suffice.
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Old 08-08-2012, 10:39 PM   #8
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Quote:
Originally Posted by Minno
Here's another venting picture. The black ABS pipe on the wall is our vent line. On the left is where the vent goes inside the wall and exits through the roof. This was the original vent for the kitchen sink in or trailer. If you follow that towards the rear of the trailer, the first tee goes down to vent the two gray tanks we added. The vent line continues on the inner skin to the rear through the bathroom wall, and then drops to vent the black water tank. We're using the single roof opening to vent all 3 tanks. The other black pipe on the floor is the drain from the bathroom tub/shower and sink.

If you join the vent of the gray tank with the black tank, just be sure to join it high enough to help ensure that you don't end up with any black water overflow going into your gray tank. Our vent on the wall is above the level of the toilet bowl. So, if the black tank was full, we'd have it backed up into the toilet before it overflowed into the gray tank.

Chris
As the vent enters the wall, what type of tube is it that can fit in the small space? Is it flexible or oval shaped? I'm trying to figure all this out now.
Thanks,

JT
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Old 08-09-2012, 07:58 AM   #9
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2vets: We used black felxible pond pipe from the black tank vent to the solid ABS pipe vent that you can can in my picture above (post 6). It's 1 1/2", black, with the spiral ribs in it. Picked it up at Menards. We used that to go around the curve at the rear of the trailer. It's the bottom black pipe in this picture:

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54breadloaf: The vent pipe that goes up inside the wall was the original one that was there. It's 1 1/2" black ABS that Airstream flattened and curved to fit inside the wall. Since it's a vent, you could go with a smaller diameter pipe, and even use a flexible pond pipe to make the bend easier. Here's a picture of it during re-installation of the inner skins.

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Chris
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Old 08-09-2012, 09:08 AM   #10
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Excellent info. Thanks, that helps a lot .
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Old 08-09-2012, 09:26 AM   #11
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Why do they plumb the drain on the grey water tank with 1.5" pipe rather than 3"?
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Old 08-09-2012, 11:43 AM   #12
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Probably a combination of cost and weight and SOP. You shouldn't need anything larger than 1 1/2" on the gray because everything runs through a sink or tub/shower drain (no solids or TP like in the black tank).
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Old 08-23-2012, 06:47 PM   #13
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Does anybody have photos of mounting gray and black water tanks? That's next on my long list.
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Old 08-24-2012, 07:28 AM   #14
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We have some in our thread: http://www.airforums.com/forums/f185...-50967-19.html

Post 255 shows the black tank being installed. Posts 262 and 264 show the two gray tanks. Be sure to read post 264 and not try to mount the gray tank like I did in post 262. The supports I tried in post 262 were not strong enough.

Chris
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