162 PIPES AND NOZZLES.
Riveting.—For ordinary pipe under light pressure a very common style is to have the seams single-riveted, the rivets (say 1/8 of
an inch in diameter for an 11-inch pipe) being spaced 1 or l-1/4 inch
apart on the longitudinal seams, and sometimes as much as 3 inches
apart on the circular seams. Pipe thus put together becomes watertight
in use through the particles which naturally float in the water, or can
be made so by throwing in a few bags of sawdust or shovelfuls of dirt,
and will remain tight even when subjected to a pressure as great as 200
lbs. per square inch.
heavy pressures and more careful construction the circular seams have a
single row of rivets 1 inch apart, while the longitudinal seams are
double-riveted, with rivets spaced 1 inch apart in two rows about 1/2 inch from each other.
Cold-riveting is common. In very particular work only is hot-riveting resorted to.