Could you solve this question please The 21000seat grandstan

The 21,000-seat grandstand ofthe Mile High Stadium in Denver, home of the Broncos. sits on water-lubricated hydrostatic rubber bearing pads. When the pads are pressurized, the entire section of the grandstand floats on a film of water and is moved back 145 feet with very little effort. It is then set down in place, producing an arena suitable for playing baseball. The total weight of the stand is 9,000,000 pounds. Select a supply pressure and design appropriate number of hydrostatic pads and the required capillary compensating elements for this application BALLPARK

Solution

GIVEN:- Number of grand seats (N) = 21000, Total weight of seats (W) = 9000000 lbs,

TO FIND:- Supply pressure selection (Ps), Number of hydrostatic pads (n) and capillary compensating elements.

SOLUTION:- Individual weight of grand seat w = W / N = 9000000 / 21000 = 428.57 lbs = 1906.96 N

A typical hydrostatic bearing pad has a capacity to lift weight of 6000 N and a typical supply pressure of 2 MPa and a capillary compensating element of corresponding c/s area = 449.45 lbs / 290 psi = 1.55 in2

So diameter will be = [(1.55 x 4) / 3.142]^0.5 = 1.40 in

So, for our current situation requirement using this bearing pad, we would be able to lift 3 grand seats.

Therefore total number of bearing pads required would be 21000 / 3 = 7000.

ANSWER ---->Number of hydrostatic pads n = 7000, Supply pressure Ps = 2 MPa and Capillary diameter = 1.40 in