The classic equation for hoop stress created by an internal pressure on a thin wall cylindrical pressure vessel is given in Eq. (1.6): (1.6)σh=Prt where P, the internal pressure; t, the wall thickness; r, the radius of the cylinder. The SI unit for P is Pascal, while t and r ...
t = is the wall thickness r = is the inside radius of the cylinder. Dm = Mean Diameter (Outside diameter - t). Mean diameter of OD and ID... σθ = is the hoop stress.The hoop stress equation for thin shells is also approximately valid for spherical vessels, including plant cells...
The hoop stress σh in a pipe can be determined by the equation [2.6]σh=(pi−pe)(D−t)2t where σh = hoop stress pi = internal or external design pressure pe = external design pressure D = nominal outside diameter of pipe t = minimum pipe wall thickness For relatively thick-w...