|Reg. 173, Reg. 174
||Rivets shall be closed by hydraulic
machinery wherever the design of the boiler permits; the
rivets may be closed by hand or pneumatic hammer in position
where hydraulic riveting is impracticable.
||Rivets shall be of sufficient
length to fill rivet holes and form sound and substantial
heads. The heads shall be finished concentrically with
the rivet shanks. Rivets shall be heated uniformly throughout
their full length.
||Drill pins shall not be used
with such force as to distort the rivet holes. If the
rivet holes are found not to be fair when the plates are
bolted up for riveting the holes shall be reamed fair
before the riveting is commenced.
||For hydraulic riveting the
pressure shall be the least necessary to ensure a tight
joint, and only sufficient pressure shall be used to close
the rivets properly and securely without indenting, buckling
or otherwise damaging the plate. The rivets shall be allowed
to shrink while under pressure from the riveting machine.
Fullering and Caulking
All seams shall be fullered or caulked inside and outside and
this shall be done in such a manner that the plates are not
sprung or damaged.