Also, for those who want to know what the tanks look like, on
Greer Tanks homepage,
There is a (not really very good) picture of a stack of
them, probably at their fabrication yard in Fairbanks,
They also have a location in Washington state, so
perhaps the name is known in the Pacific Northwest too,
but in Alaska there name "Greer Tank" is seen
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson
Ukpeagvik (Barrow, Alaska) firstname.lastname@example.org
If, as you say, it is a cylinder that is 4 feet across and 6 foot
deep, the formula goes something like this:
Volume in c.f. = 3.14*2^2*6
76.36 c.f. = 563 gallons.
So, your sizing is about right.
Reversing the equation:
550 gallons = 73.52 c.f.
So your 550 gallons is at 5.85 feet, say 5'10", which makes sense
because you want to avoid a spill.
Knowing that, a cylinder is linear, so:
550 gallons / 70" = 7.86 gallons per inch.
So, at 16" there 125.76 gallons.
If however, the tank isn't really cylindrical, then you're pretty well
screwed because the math gets a lot harder. It would take a bit to
figure the formula, but you could assume the tank to different shape
and you could easily approximate it, say be dividing it into 10
horizontal slices and calculating the volume of each slice.
Consider asking your supplier about a 'tank chart' and gauge stick.
Some online calculators [most also create charts]
For the (idealized) mathematics of a horizontal cylindrical tank (flat
ends) see, for example:
<http://mathworld.wolfram.com/CylindricalSegment.html esp. (26)
[picture toward bottom of page]
and the related page
<http://mathworld.wolfram.com/CircularSegment.html esp. (18)
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