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Shared from Design of Machine Elements - 3 on Aug 29, 2019 11:52 AM

A steam boiler 1.2 metres in diameter generates steam at a gauge pressure of 0.7 N/mm2. Assuming the efficiency of riveted joint as 75%, find the thickness (in mm up to one decimal place) of the shell. (Given: Factor of safety = 5, Ultimate tensile stress = 385 N/mm2)

 
6.7
8
7.3
9.2

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(Pd)/4t is the hoop stress to be considered since it is to be considered as a shell / sphere. so ans will be half of this??