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Old 06-08-2009, 02:46 PM   #1
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blackwater/greywater tank 72 tradewind

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I am restoring my trailer and trying to figure all the systems out whenever I use any water the blackwater tank fills up to quickly and backs up into my shower. does anyone know why this would happen
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Old 06-08-2009, 03:26 PM   #2
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If there is only one tank it is fairly small. If there are two tanks then running water should not fill the black tank. We need a vintage expert here. jim
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Old 06-08-2009, 03:45 PM   #3
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Quote:
Originally Posted by roguebrun View Post
question

I am restoring my trailer and trying to figure all the systems out whenever I use any water the blackwater tank fills up to quickly and backs up into my shower. does anyone know why this would happen
Before 1974 Airstream did not offer grey tanks on all models. Sounds like your '72 fits with this. My '64 had a grey/black tank that only held 8 gallons! My '90 holds somethng like 35 gallons of black, and 45 gallons of grey. Assuming your '72 holds not much more than 8 gallons, it takes no time to fill it up. It's not an ideal design, as black water in the shower is beyond gross! In my remodel of the '64, there will be separate black and grey tanks, no question.
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Old 06-08-2009, 03:48 PM   #4
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Graywater in the blackwater in the shower

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Originally Posted by roguebrun View Post
question

I am restoring my trailer and trying to figure all the systems out whenever I use any water the blackwater tank fills up to quickly and backs up into my shower. does anyone know why this would happen
>>>>>>>>>>>>>>>>>>
If your AS is like our '69 Sovereign, we only have one tank. Simply put, the black water is held into the tank by the (blade type) waste valve. You pull it up the and black water goes out. The gray water pipe goes into the sewer pipe outside the blackwater valve. So the only thing holding the graywater into the sewer is the cap at the outside end. So...If you leave the blackwater valve closed the shower and sink water can only go as far as the tank, not into the tank.(so once the pipes are full the gray water will back up into the shower.) If you leave the blackwater valve open (but the sewer end cap on) the graywater will back up into the black tank, and then will back up into the shower, when full. Yurk. Been there done that. The only reason I know this is because my blackwater tank drain valve has failed and I have spent the morning out there trying to figure out how to replace it. And that's the way it looks to me. Maybe someone else has pictures(drawings), because as I read my description I realize I would hate to try to understand the system from a verbal description.
cheers, bill b.
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Old 06-08-2009, 04:01 PM   #5
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We have a 72 Tradewind. In 72 you didn't need a grey tank, you simply opened the valve and allow the water to sidcharge onto the ground, no need for a grey tank.

Now in most areas you can't discharge your grey water onto the ground. We have installed a grey water tank, about 35 gallon size. If you want to see how we did it go to the Tradewind section of the forums and click onto the three titled. "Annette's Folley". Welcome to the forums, this is an invaluable source for information.

Did they make a park model in 75?

Annette
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Old 06-08-2009, 04:12 PM   #6
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i just went out there filled it up then pulled valve and it does not even seem like 8 gallon more like 2 gallons could there be anything else that might cause this
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Old 06-08-2009, 05:01 PM   #7
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ok i went back out again filled up 7 gallon bucket poured 5 gallons in and it started coming out of shower drain. WOW what a poor design why would they make it so small!!! ugh I guess unless you are hooked up to sewer your best bet is to put another tank in that bugs
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Old 06-08-2009, 05:04 PM   #8
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I can't beleve that it only holds 5 gallons, you've got to have another problem. Have you dropped the back belly pan to see if you have a tank for grey water? You should, unless they made a park model for 75, then it would have no tank. That sucks.

Annette
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Old 06-08-2009, 05:12 PM   #9
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What do you have for a trailer? Your profile says, 75, but your title says 72? Which is it? A 72 will not have a grey water tank and the water that you are pouring in is just backing up in all the drain pipes and then backing up into your shower. Then when you open the valve you are draining the backed up water out.

Annette

P.S. Our blackwater tank is about 18 gallons. That's the one that sits on the floor under the toilet.
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Old 06-08-2009, 05:45 PM   #10
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it's a 72 tradewind 25ft I thought it was a 75 when I first bought it then looked closer at the title so no grey water only grey and black combined under the toilet

I can see the tank under the toilet when I open the closet, but I poured 5 gallons of water into the toilet as well and it came up through the shower drain again so it does not seem to hold 18 gallons what would cause this. I will take the belly pan off to check etc but I guess I will have to put another tank in eventually for the gray water.
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Old 06-08-2009, 06:12 PM   #11
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You could have what they call "the blackhills" stuck in there, If you get my drift. They say it get hard as a rock and is almost impossible to get it out. That's what happens if someone didn't empty the poop tank!

If you go to my tjread there is a picture on there somewhere of our new blackwater tank sitting in the corner, so you could get a visual of what the size is. Unless your bath layout is different than ours, and it could be. Is your toilet off to the right in the bath or straight in front of you when you stand in the doorway?

Annette

P.S. Post a picture of what you think is the blackwater tank. I Should be directly under the toilet, not in the closet,
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Old 06-08-2009, 09:09 PM   #12
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toilet is off to the right I will take a picture and post it in the morning

thanks for your help
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Old 06-08-2009, 09:23 PM   #13
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There is only one way that water from the toilet (black tank) can back into the shower.

The drain valve for the black tank is open or leaking (badly) and the drain outlet cap in on. This will cause the water from the black tank to flow down to the outlet cap and then start to back into the grey water lines. Since the black tank is higher then the shower drain, the water will back into the shower before the black tank fills.
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Old 06-08-2009, 09:27 PM   #14
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Close the 3" blade valve,and see how much it will hold ,With the valve open ,all you are doing is filling up the pipes.If you don`t have full hookup you need a blueboy for your gray.Dave
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