ng
in a plane which came directly in front of the condenser. The column P
shown in the plan was so located as to prevent a direct connection
between the centrifugal circulating pump and the condenser inlet. The
centrifugal pump was direct-connected to a vertical high-speed engine,
and the coupling is shown at E in the elevation.

Every possible plan was contemplated to accommodate the engine and pump
without removing any of the columns, and the arrangement shown was
finally adopted, leaving the column P in its former place by employing
an S-connection from the pump to the condenser. It should be stated that
the pump was purchased under a guarantee to deliver 6000 gallons per
minute under a head of 50 feet, with an impeller velocity of 285
revolutions per minute. The vertical engine to which the pump was
connected proved to be utterly unfit for running at a speed beyond 225
to 230 revolutions per minute, and in addition the S-bend would
obviously reduce the capacity, even at the proper speed of the impeller.

Besides these factors there was another feature even more serious. It
was found that when No. 2 unit was operating No. 1 could not get as
great a quantity of circulating water as when No. 2 was shut down. This
was because No. 2 was drawing most of the water, and No. 1 received only
that which No. 2 could not pull from the suction pipe A. This will be
clear from the fact that the suction and discharge pipes for No. 1 were
only 16 inches, while those of No. 2 were 20 inches and 16 inches,
respectively. The condenser for No. 2 had 1000 square feet less cooling
surface than No. 1, which had 6000 square feet and was supplied with
cooling water by means of two centrifugal pumps of smaller capacity
than for No. 1 and arranged in parallel. These were each driven by an
electric motor, and were termed "The Siamese Twins," due to the way in
which they were connected.

The load factor of the plant ranged from 0.22 to 0.30, the load being
almost entirely lighting, so that for the winter season the load factor
reached the latter figure. The day load was, therefore, light and not
sufficient to give one turbine more than from one-fourth to one-third
its rated capacity. Under these conditions No. 1 unit was able to
operate much more satisfactorily than when fully loaded, because of the
fact that the cooling water was more effective. This was, of course, all
used by No. 1 unit when No. 2 was not operating. At best, however, it
was