The water ends are
composition fitted for salt water and have valve decks and plungers
entirely of that material.
[Illustration: COAL UNLOADING TOWER ON WEST 58TH STREET PIER]
The dry vacuum pumps are of the vertical form, and each is located
alongside of the corresponding circulating pump. The steam cylinders
also project above the engine-room floor. The vacuum cylinder is
immediately below the steam cylinder and has a valve that is
mechanically operated by an eccentric on the shaft. These pumps are of
the close-clearance type, and, while controlled by a governor, can be
changed in speed while running to any determined rate.
[Sidenote: _Exhaust
Piping_]
From each atmospheric exhaust valve, which is direct-connected to the
condensing chamber at each low-pressure cylinder, is run downward a
30-inch riveted-steel exhaust pipe. At a point just under the
engine-room floor the exhaust pipe is carried horizontally around the
engine foundations, the two from each pair of engines uniting in a
40-inch riser to the roof. This riser is between the pair of engines
and back of the high-pressure cylinder, thus passing through the
so-called pipe area, where it also receives exhaust steam from the
pump auxiliaries. At the roof the 40-inch riser is run into a 48-inch
stand pipe. This is capped with an exhaust head, the top of which is
35 feet above the roof.
All the exhaust piping 30 inches in diameter and over is
longitudinally riveted steel with cast-iron flanges riveted on to it.
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