Thick or thin walled cylinders

[Big Jock]

20 m3 of gas at a pressure of 25 bar is to be stored in a cylindrical
pressure vessel 2 m long. Given the following information :
The yield strength of the vessel material is 14,000 psi
If a factor of safety of 5 is to be used, determine:
(a) Whether the vessel should be treated as a thin or thick cylinder.
(b) The wall thickness required for the pressure vessel

Not sure where to start really

20 m3 of gas at a pressure of 25 bar - I guess 25 bar is 25 x 10^6 and 20 m^3 is 20,000 litres but other than that I am stumped any help getting started or someone will to help me work through it would be greatly appreciated...

 

[Valkarie]

Answer:a) The vessel should be treated as a thick cylinder.b) The wall thickness required for the pressure vessel can be calculated using the following equation: t = (P x D)/(2 x FS x S) where P is the internal pressure, D is the internal diameter of the cylinder, FS is the safety factor, and S is the yield strength of the vessel material. For this example, we would have: t = (25 x 10^6 x 2)/(2 x 5 x 14,000 psi) t = 17.8 mm