A rylindrical boiler with hemispherical ends has an outside diameter of 6 ft. lf the hoop and axial stresses in the boiler must be limited to 15 ksi and 8 ksi respectively, determine the thickness of steel plate required if the internal pressure in the boiler will be 200 psi.

The pressure tank shown is fabricated from spirally wrapped metal plates that are welded at the seams in the orientation shown where β=55∘β=55∘. The tank has an inside diameter of 26.626.6 in.in. and a wall thickness of 0.3500.350 in.in.  Determine the largest gage pressure that can be used inside the tank if the allowable normal stress perpendicular to the weld is 18.518.5 ksiksi and the allowable shear stress parallel to the weld is 8.58.5 ksiksi.

I need answer within 20 minutes please please with my best wishes

The cover of a cylindrical pressure vessel made of cast iron is shown in fig.1 The inner diameter of the cylinder is 500 mm and the internal pressure is limited to 2MPa. The cover is fixed to the cylinder by means of 16 bolts with a nominal diameter of 20 mm. Each bolt is initially tightened with a preload of 20 KN. The bolts are made of steel FeE250 (S yt = 250 N/ mm 2 ). Assume. E for steel = 207 KN/mm 2 ,E for cast iron = 100 KN/mm 2, E for Zinc = 90 KN/mm 2,Determine the factor of safety for bolts considering the effect of the gasket.