22 PROBLEMS IN STRENGTH OF MATERIALS 



157. A boiler 48 inches in diameter carries a steam pressure of 65 

 pounds per square inch. It has single-riveted longitudinal lap joints for 

 which t = \ inch, d= | inch, and p=2 inches. Find the factor of safety. 



158. Determine the steam pressure which will rupture a boiler 

 shell 5 feet in diameter, with single-riveted longitudinal lap joints 

 for which t = \ inch, d = | inch, and p = 2 inches. 



159. A boiler shell 60 inches in diameter, with single-riveted longi- 

 tudinal lap joints, is to carry a steam pressure of 78 pounds per square 

 inch, with a factor of safety of 5. Determine the thickness of the 

 shell and the pitch of the rivets if the efficiency of the joint is 0.572. 



160. Determine the factor of safety when a steam pressure of 80 

 pounds per square inch is used in a 60-inch boiler, with double- 

 riveted, longitudinal lap joints for which t = | inch, d = i| inch, and 

 p = 3^ inches. 



161. What steam pressure will burst a boiler 4 feet in diameter, 

 with double-riveted, longitudinal lap joints for which t = \ inch, 

 d = | inch, and p = 3 J- inches ? 



162. A boiler shell 5 feet in diameter has single-riveted, two-strap 

 butt joints for the longitudinal seams, for which t = J- inch, d = l| 

 inch, and p=2\ inches. What steam pressure can it carry with a 

 factor of safety of 5 ? 



163. A boiler 36 inches in diameter has double -riveted, two-strap 

 butt joints for the longitudinal seams, for which t = | inch, d = 1 inch, 

 and p = 3 1 inches. Find the factor of safety for a steam pressure of 

 250 pounds per square inch. 



164. A boiler 5 feet in diameter, with longitudinal, double-riveted, 

 two-strap butt joints, is to carry a steam pressure of 103 pounds per 

 square inch, with a factor of safety of 5. Find the thickness of the shell 

 and the pitch of the rivets if the efficiency of the joints is 75 per cent. 



165. A cylindrical stand-pipe, 100 feet high, inside diameter 18 feet, 

 has longitudinal, double-riveted two-strap butt joints at the lowest 

 part of the pipe, for which t = f inch, d = 1 inch, and p = 3 J inches. 

 Compute the factor of safety when the pipe is full of water. 



166. A boiler 66 inches in diameter, with longitudinal, triple- 

 riveted, two-strap butt joints, is to carry a steam pressure of 100 

 pounds per square inch, with a factor of safety of 5. Find the thick- 

 ness of the shell and the pitch of the rivets if the efficiency of the 

 joints is 80 per cent. 



