I am looking for calculation help

Oil industry storage tank with inner floating roof

Tank Dia: 36.57m = 120 ft
Floating roof weight = 12353 kg = 27176 Lbs Floating roof seal force against tank shell = 8 Lbs friction coefficient rubber and steel = 0.4

How to calculate net pressure of floating roof on the liquid.

I will appreciate if someone can show me how to calculate.

Thanks