A filament-wound E-glass/epoxy pressure vessel has a diameter of 50 in. (127 cm), a wall thickness of 0.25 in. (6.35 mm), and a helical wrap angle θ = 54.74°. Using a netting analysis and a safety factor of 2, estimate the allowable internal pressure in the vessel. Compare with the allowable internal pressure in a 6061-T6 aluminum alloy pressure vessel having the same dimensions. For the aluminum vessel, assume that the tensile yield stress is 40,000 psi (276 MPa) and use the maximum shear stress yield criterion. Although the netting analysis is greatly oversimplified, these approximate results should demonstrate the significant advantages of fiber composite construction over conventional metallic construction.