It will work if you repeat the measurement.
If 20 gallons lowers the level 3/4" on the first try and 20 gallons lowers
the level 1" on the second try, it's a simple problem in differential
calculus to divine the capacity of the tank (assuming it's cylindrical and
horizontally oriented. It the tank is spherical, a different equation is
used. If the tank is a coiled tube of unknown diameter ending in a bulb of
unknown shape, the equation is slightly more complex.
You need to know the height, width and length of the tank in order to
calculate the amount of oil in the tank accurately.
Basically, the tank's shape is a half cylinder stacked on top of a
box, stacked on top of a half cylinder.
If the oil is deeper than the tank is wide, you can easily calculate
the contents using simple geometric forumulas. Figure out the volume
of the half cylinder, then figure out the volume of the box.
Let's say 24" of oil in a tank 16" wide and 48" long. The half
cylinder bottom is completely full of oil, and there is 8" of oil in
the box section. Volume of the half cylinder (pi * radius^2 * length /
2) is 4825 cubic inches, at 231 cubic inches per gallon, is about 21
gallons. Volume of the oil in the box section (length * width *
height) is 6144 cubic inches, or approximately 26-1/2 gallons.
The value of the oil wouldn't come anywhere near the cost of being
properly equipped and certified to pump and transport the oil. That's
why it costs you an arm and a leg to have an environmental cleanup
company come in and pump out the old oil. They're not making much on
the deal; it all goes toward that fancy equipment and costly disposal
procedures mandated by the various government agencies.
Put an add on the free part of Craig's list as y'all recommended.
Turns out there were all kinds of folks willing to take it. Gent who
did had a pickup full of M.T. 55-gallon drums, a handpump and
necessary plumbing. He pumped out approx 165 gallons, leaving about 1
1/2" sludge in the bottom. Said he was going to burn it himself.
Yo, Tony! "burn it himself" means he's going to take the
barrels of oil back to his own place, and put the oil in his
fuel oil tank.
The foam company still gets to fill the under ground tank. I
think filling the tank with sand or some kind of rock makes
sense, to me. But, no one asked.
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