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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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