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Old 11-26-2020, 08:29 AM   #41
Montana Man
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Join Date: Jun 2018
Location: Carson City
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M.O.C. #21963
"To return to my explanation, the black tank IS effectively a closed system up until the point the liquid has risen to the top of the vent pipe."

As long as a tank is vented, it is not a closed system. If at some point the vent is blocked, the tank then becomes a closed system. That action causes pressure to build in all directions as a stronger force introduces volume (water) into that space. Just like a hydraulic ram.

I agree in that with what we know, the tank failed before any fluids reached the roof. However, that is insignificant. The tank failed by the waters weight exerting static pressure downward. Not by an excessive hydraulic pressure exerting pressure in all directions within the tank.

BTW, Happy Thanksgiving.
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Old 11-29-2020, 05:51 PM   #42
Dee_Dub
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Join Date: Jul 2019
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M.O.C. #24453
WOW - Thank you everyone for your input! I have put the trailer to bed for the season (my furnace quit working - another topic) and will attack the black tank in the spring. I will then be able to tell you where the "POP" occurred. Either the top of the tank failed or it failed at the outlet pipe that may have been improperly sealed. When I find out, I will let all of you know. Happy Travels
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