GEV's

I'm a little confused.

I'm going to assume American/English units here instead of metric
as I am more comfortable with that.  Also, the "," comma is a 
seperator, not a decimal point.

Our GEV tank masses 80 tons or 160,000lbs.

Just a guess but the skirt would cover 8ft by 12 ft at a minimum.
96 square feet or 13,824 square inches, which gives me 11.57 psi.
I don't see that as being terribly difficult to generate with a
closed skirt.  Is that an incorrect assumption?

Roger