CONCEPT:At the end of the cylinder, a cap is fixed.For pressure:The pressure on the circumference of plate is EQUAL to the shear stress on the plate, i.e. \(P \times \frac{\pi }{4}{D^2} = {\TAU _y} \times \pi \times D \times {t_1}\)THEREFORE, \(P = \frac{{4{t_1}{\tau _y}}}{D}\)