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Old 06-19-2016, 03:29 PM   #31
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Flushing tank

When the flushing the black tank using the hose connection, and a closed drain valve, the tank will fill to capacity, then start pressurizing the tank, while trying to force water out of the vent tube. Essentially you are pushing against 35-45 gallons of black water and forcing it up a vertical tube about 2 inches in diameter.
The tank bulges, and may pop a band or one of the bolts holding the bands. If you opened the toilet valve, it would surge that way. Larger hole, and lower than the opening of the vent tube.
When you open the black drain valve, all that pressure relieves, and jets out of the valve.
When flushing, I NEVER walk away from the project. Stay right there, and work the valve or count to 100, but don't walk away to do anything else.
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Old 06-20-2016, 08:19 AM   #32
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What ever you do,,,
Please don't take a chance of dropping your black tank on the Interstate !!!
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Old 06-20-2016, 08:27 AM   #33
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A friend of mine told me a story about her driving down the road in an old class c when she hit a piece of rubber from a semi truck tire. She said the rubber sliced open her black tank showering the road and the cars behind her.
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Old 06-20-2016, 08:41 AM   #34
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Originally Posted by timfromma View Post
A friend of mine told me a story about her driving down the road in an old class c when she hit a piece of rubber from a semi truck tire. She said the rubber sliced open her black tank showering the road and the cars behind her.
Aren't we glad we were not behind her on Motorcycles !!!
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Old 06-20-2016, 11:35 AM   #35
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Originally Posted by tkarper14 View Post
X2

Better to find out when now then then when the tank is full and about to fallout.

I have no doubt the pressure builds up. I found out first hand. Fortunately, it was me that opened the toilet to check the water level and not DW. Why does this happen? I would think the pressure would go out the vent pipe.

I like the timer suggestion and will try it myself. I am concerned 8 minutes could be too long. I guess I will and see what happens. What's the worst that can happen? LMAO.
I agree that 8 minutes could be too much. Depends on tank size and water pressure. From my past, working for a water utility, I learned that an outdoor hose left running, full blast can easily dispense 10 gallons per minute so with our old 30 BW I kept the flow rate moderate and NEVER ran flush water more than three minutes. Kept my wrist watch in my face practically counting the seconds and watching it, because God knows, I am way too easily distracted to risk turning away for that "minute" that becomes 15 too easily. Must be poopophobic.
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