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Old 11-10-2015, 12:34 PM   #1
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There Must Be An Explanation

How would you explain this strange occurrence?

A couple of weeks ago, we were doing our usual weekly black tank 'empty and rinse' maintenance routine. After first emptying the black tank, we began filling the black tank (which usually takes about 15 minutes) with water to get a good rinse. This time, about ten minutes into refilling the black water tank with water, we noticed brownish water streaming down from the roof on both sides of the trailer towards the front. I'm pretty sure it was rinse water from the black water tank due to the light brown color and white bits but can't say for sure.

Can anybody explain what happened? Once, when filling the black water tank with water to rinse it, we over filled and the overflow came up through the toilet inside the trailer. That did not happen this time and there were no visible leaks inside the trailer so we're hesitant to say that the cause was overfilling the black tank with water.

Our biggest questions are .... how does water get to the roof of the trailer? .... and what happened and why?

Thanks.
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Old 11-10-2015, 12:35 PM   #2
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Tank vent overflow ...
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Old 11-10-2015, 12:37 PM   #3
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Old 11-10-2015, 12:42 PM   #4
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What are you using to re-fill the black tank? Sewer Solution? Tank Tornado?

Sure sounds like a vent overflow.
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Old 11-10-2015, 12:49 PM   #5
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In my manual it says to only ever run the tank flush with the black tank gate valve open. I would assume this is one of the two possible bad outcomes if you don't?
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Old 11-10-2015, 12:53 PM   #6
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Originally Posted by nrgtrakr View Post
Tank vent overflow ...
All plumbing needs roof vents - mainly to carry away sewer gas - which can be nasty even from a gray tank or sink drain, and is worse from fermenting human waste. The gas in the black tank would build up pressure and eventually pop the seal on the flusher if it couldn't just bubble out of the air and into a vent stack. And the smell when flushing - about 10 times worse than it already is. You filled the tank until all of the air was exhausted, then continued to fill the vent and finally the vent is filled and - you have a waterfall!

Congratulations (sort of) it beats flooding the inside!

Paula
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Old 11-11-2015, 12:09 PM   #7
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I'm not surprised it didn't come up through the toilet (flap saved you there) but am surprised that it didn't come up through the bathroom sink drain.

Most black tanks on newer Airstreams service both the toilet and the bathroom sink. Not sure about yours. But if it does, you were fortunate to have the sink drain closed.


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Old 11-11-2015, 12:22 PM   #8
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Some water supplies are higher pressure, some lower, some are capable of more flow, some less, so flow rate can be variable.

You filled the tank, and then some fast.

Good thing you didn't flush the toilet in the middle of this mishap or you might have gotten a very unpleasant shower.


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Old 11-11-2015, 12:51 PM   #9
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All plumbing needs roof vents - mainly to carry away sewer gas - which can be nasty even from a gray tank or sink drain, and is worse from fermenting human waste.
From an engineering standpoint, that's not actually the purpose of the tank vents, otherwise your fresh tank wouldn't need to be vented.

Basically an "empty" tank is full of air. When water runs in, the air has to come out. When you empty the tank, air has to get back in. THAT is what the vents are for.

However, it is true that air from the waste tanks can be smelly and unhealthy to breathe, and that's why the vents go through the roof, so the smell doesn't get into the trailer.

But getting back to the OP's problem, if nothing else he managed to perform a successful tank pressure test, because if the black tank didn't leak under the pressure of several feet of water column, it's certainly not going to leak under normal use.
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Old 11-11-2015, 01:53 PM   #10
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But getting back to the OP's problem, if nothing else he managed to perform a successful tank pressure test, because if the black tank didn't leak under the pressure of several feet of water column, it's certainly not going to leak under normal use.


True dat!


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Old 11-11-2015, 03:09 PM   #11
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And for the moment anyway, it's REALLY clean.
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Old 11-11-2015, 04:28 PM   #12
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Cool

I watched a movie about a family in a motorhome that something like this happened to...never thought it would actually happen!..
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Old 11-12-2015, 07:50 AM   #13
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It is good when we learn from our mistakes. It is even better when we learn from others' mistakes. (Some my own appear in other threads.)
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Old 11-12-2015, 08:02 AM   #14
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A fellow I know hooked his hose up, water is on and valve is closed, started talking with the neighbor when he heard a Big Bang , what was that? The water pressure did not go up the vent pipe, but blew the glued on top of the tank off, he had to clean everything and re glue it....it was a 5th wheel trailer so he had plenty of room from the bottom..........
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