a cylinder with an unconfined gasket between head and body applies a static load of 14 kn to its head. the head is steel, the copper-asbestos, unconfined gasket is 3-mm-thick and the cylinder flange is steel. the pressure diameter is 80 mm and the outside flange diameter is 140 mm. the effective clamp length of a cap screw is 80 mm. specify a suitable number, class, preload, and bolt circle for the cylinder head cap screws to give a minimum safety factor of 1.5 for any possible failure mode and specify the torque required on each bolt to obtain the preload if the threads are lubricated.