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08/12/2011 12:10:40 AM · #26 |
Get a 5 gallon bucket or two, a big funnel, and a big shop-vac. Take the wires off the upper element and unscrew it. Use the funnel to drain the water into the bucket or buckets. When the water gets down that far, then you can use the hole and siphon the rest of the water out with your garden hose. To start the siphon, hook the hose to a faucet, put the hose into the hole, and toward the bottom of the tank. Turn on the water to the hose to drive out the air, then disconnect the end at the faucet. You can then lay the end outside, or catch it in buckets. If you are using a short hose and buckets, there are several ways to start the siphon.
You need to use the vac to pick up all the water that you can, and get some fans or blowers to help dry the carpet. Some places here rent big blowers that you can place under the edge of the carpet to force air and help dry it out. The moisture in the air will need a way to get out too, so it will help to make sure that you have ventilation through the room or rooms that are wet. If you close it up, it will be like a greenhouse and ruin everything in the rooms.
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08/12/2011 05:34:32 AM · #27 |
Slippy, I think your calculations are off.
The maximum possible drain rate for a tank with a hole or tap at the base can be calculated directly from Bernoulli's equation, and is found to be proportional to the square root of the height of the fluid in the tank. This is Torricelli's law, showing that Torricelli's law is compatible with Bernoulli's principle. Viscosity lowers this drain rate. This is reflected in the discharge coefficient, which is a function of the Reynolds number and the shape of the orifice.
In summary, you should be using the following equation to determine how long it'll take to drain the tank.
You'll need to adjust this if you increase the size of the hole with a hammer.
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08/12/2011 07:17:00 AM · #28 |
| COULD NOT HAVE SAID IT MYSELF better |
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08/12/2011 07:52:36 AM · #29 |
Originally posted by JH:
Slippy, I think your calculations are off.
The maximum possible drain rate for a tank with a hole or tap at the base can be calculated directly from Bernoulli's equation, and is found to be proportional to the square root of the height of the fluid in the tank. This is Torricelli's law, showing that Torricelli's law is compatible with Bernoulli's principle. Viscosity lowers this drain rate. This is reflected in the discharge coefficient, which is a function of the Reynolds number and the shape of the orifice.
In summary, you should be using the following equation to determine how long it'll take to drain the tank.
You'll need to adjust this if you increase the size of the hole with a hammer. |
that will give him that max drain rate, not the time to drain.
you need to use a differential equation since the height of the water varies with time. the tank will drain faster with more water in it and then slow as the column of water get shorter.
V=Volume (cf)
T=Time
Ad=area of the drain hole (in^2)
g=Gravity
h= height of tank
we set up our DE of Volume with respect to time
dV/dt = Ad*sqrt(2gh)
after intgrating we get
V = Ad*sqrt(2gh)*t + C1
now we need to apply the boundary conditions, namely at t=0 V=6.7CF (50 gal)
substituting we get
V=Ad*sqrt(2gh)*0 + 6.69 yields C1 = -6.7
so now if you want to know the volume at any time, use the equation
V = Ad*sqrt(2gh)* t - 6.7
or in this you want to know how long it will take, so solve for t when V = 0, you can make an assumption on the drain area.
t = 6.7/(Ad*sqrt(2gh)
the size of the drain hole (Ad) will govern the flow rate, so in conclusion if you want to drain it faster, drill a bigger hole.
Message edited by author 2011-08-12 07:54:11. |
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08/12/2011 10:10:45 AM · #30 |
Multiply the time calculated by 3 because all those numbers clog up the hole.
ETA, This isn't the first time Slippy has gotten himself into hot water around here.
Message edited by author 2011-08-12 10:13:58.
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08/12/2011 11:03:56 AM · #31 |
It's done. The old tank is gone and a new one is installed. Unfortunately, not fast enough to beat the mathmagicians. ;-D
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08/12/2011 11:05:45 AM · #32 |
Originally posted by Strikeslip:
It's done. The old tank is gone and a new one is installed. Unfortunately, not fast enough to beat the mathmagicians. ;-D |
I was going to say just leave it to the professionals. LOL! I had mine replaced a few weeks ago (though mine was still running well) and they didn't get a drop of water anywhere. |
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08/12/2011 11:46:19 AM · #33 |
| awesome. brilliant. - slippy all dry now - no more slippy slidey? |
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08/13/2011 12:22:50 AM · #34 |
| I would still blow up the old tank just on principle. |
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