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Reg. 171
MANHOLES, MUDHOLES, ETC.

 

Rivets securing compensating rings and Stand Pipes

a) For manholes or frames - The total effective shear strength of the rivets on each side of the longitudinal centre line shall be not less than the tensile strength of that portion of the shell plate, as found by Regulation 170, which is removed and the rivets securing any compensating ring or frame shall be so arranged that the joint efficiency calculated on any line parallel to the axis of the boiler through any part of such ring or frame shall not be less than the efficiency of the longitudinal seam of the boiler.
b) For stand pipes - Where the hole in the shell to accommodate a stand-pipe does not exceed 8 inches diameter the total effective shear strength of the rivets on each side of the longitudinal centre line shall not be less than 75 per cent of the tensile strength of the portion of the plate, as found by Regulation 170, which has been removed.

The strength of rivets in double shear shall be taken as 1.875 times the strength of rivets in single shear.
 
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