On Mon, 2 Jun 2008 13:49:04 -0700, "Stuart & Kathryn Fields"
wrote:

Try calculating the volume of horizontally mounted cylindrical tank with
domed hemispherical ends as a function of the height of the liquid so that
you can devise your own stab stick.

I'm horrible at higher math, but even I know you split that into a
horizontal cylinder and a sphere (for the two end shells). Solve the
height/volume for each separately, and add the results together.

And don't forget to allow for a striking pad in the bottom of the
tank at the stick hole - underground storage tanks place a big piece
of 1/2" plate there so you don't drop the stick hard a few thousand
times and manage to crack the inner wall. Or just 'the wall' on an
old single-wall tank.

-- Bruce --