A pressurized circular cylinder has a sealed cover plate fastened with steel bolts (see figure). The pressure

Question:

A pressurized circular cylinder has a sealed cover plate fastened with steel bolts (see figure). The pressure p of the gas in the cylinder is 290 psi, the inside diameter D of the cylinder is 10.0 in., and the diameter dB of the bolts is 0.50 in.
If the allowable tensile stress in the bolts is 10,000 psi, find the number n of bolts needed to fasten the cover.