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The longitudinal seam of a boiler consists of double riveted lap joint. The diameter is 3 m,plate thickness 20 mm and the rivets are 25 mm diameter and the width of the repeating section is 75 mm. The steel has the following ultimate stresses: tension 400 MPa,shear 300MPa, compression 700 MPa. Find (a)the efficiency of the lap joint and (b) the allowable internal pressure in the boiler if a factor of safety of 5 is used in the design.