Increase vessel Pressure More bolts holding the head or less

Increase vessel Pressure, More bolts holding the head or less?, double the vessel thickness or half?, a larger diameter d or smaller?

0.50\" The steel head of a SAE grade 7 bolts with nuts. The cylinder has inner diameter d steel cylinder containing gas at 98 psi is fastened to the cylinder block by 12 coarse, 5/16 inch ade 7 bolts with nuts. The cylinder has inner diameter d 5.9 inches. Each bolt is 1.75 inches long and has a 7/32 inch thick head with a 1/4 inch unthreaded portion. There are no washers, and all nuts are 17/64 inch thick. A thin and very stiff gasket in the interface seals the vessel. Each bolt is preloaded to 82% of the bolt\'s proof load force. At each bolt site, the stiffness of the clamped members kc 2.3 kb. where ko is the bolt stiffness. Determine the factor of safety for bolt failure to at least 3 digits accuracy, and enter your answer into the blank space,

Solution

To decrease the FOS the following actions to be done

1. Increase vessel Pressure

2. Less bolts holding the head

3. Half the vessel thickness

4. Large diameter of the vessel