Thank you for the replies LI and 1503.
LI, that is correct I only need to vacuum test the gas dome above the water level.
The tank is already going to be filled for hydrostatic test.
to be more specific, disregarding the irregular bottom, the tank walls are 85' with water. Im less asking for a final elevation and more asking what steps I need to find the final elevation.
I need to vacuum test a WWTP digester tank to 3 inches water column vacuum.
My tank is 82' diameter with a base(irregular sump drains) of 16,200cf, main wall area of 456,807cf and a upper area of ~14356cf.
My problem is im specced 3 inches of water column vacuum, and my tank will be filled to...
