Expansion joints are provided where necessary to relieve the piping
from the strains due to expansion and contraction, and where the
joints are located near the engine and generator they are of
corrugated copper. The expansion joints in the 40-inch risers above
the pipe area are ordinarily packed slip joints.
The exhaust piping from the auxiliaries is carried directly up into
the pipe area, where it is connected with a feed-water heater, with
means for by-passing the latter. Beyond the heater it joins the
40-inch riser to the roof. The feed-water heaters are three-pass,
vertical, water-tube heaters, designed for a working water pressure of
225 pounds per square inch.
The design of the atmospheric relief valve received special
consideration. A lever is provided to assist the valve to close, while
a dash pot prevents a too quick action in either direction.
[Sidenote: _Compressed
Air_]
The power house will be provided with a system for supplying
compressed air to various points about the structure for cleaning
electrical machinery and for such other purposes as may arise. It will
also be used for operating whistles employed for signaling. The air is
supplied to reservoir tanks by two vertical, two-stage,
electric-driven air compressors.
[Sidenote: _Oil System_]
For the lubrication of the engines an extensive oil distributing and
filtering system is provided. Filtered oil will be supplied under
pressure from elevated storage tanks, with a piping system leading to
all the various journals.
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