The Fargo forum and daily republican. [volume] (Fargo, N.D.) 1894-1957, 1911-01-07

duty centrifugal pumps. high duty
pumps chemical storage rooms, etc.
Low Duty Pumps.
There are two Lawrence Pump &
Engine Co.'S centrifugal pumps, for
pumping the raw water from suction
well to forebays and coagulating ba-
sins, each pump having a capacity of
100000 gallons daily Each pump Is
connected with a seven and one-half
horsepower Westinghouse motor. The
discharge of these pumps is into the
forebays, where a balance valve on the
discharge end Of the pipes keeps the
water at a uniform height in the
basins .-.....
cOseuIatins Basins and Forebays.
There are two coagulating basins
and two forebays. The coagulating
basins are arranged so that they may
be run as units. There are blow off
valves and sluice gates in each basin,
so that either can be cut out for clean
ing These are operated by hand
wheels on operating for. There is a
16-inch balance float valve on the raw
water supply and this balance valve is
controlled by a copper float connected
with scale in the pump room to show
the height Of the water in the fore
bays. After the water passes through
these basins it is brought back into the
supply canal located in front of the
filters
Chemical Solution Tanks. .,
There are two lime solution tanks
built OF reinforced concrete. and be-
tween these two tanks on the floor is
located the Stacking tank into which
are fitted the necessary screens and
valves for discharging the lime into
the solution tanks. In each lime So
luton tank there is an agitator driven
through gears, the shafts being OF steel
and the paddles wooden. either of
which can be driven or cut out The
agitators are for the purpose of keep
ing the lime and iron so stirred that
the proper mixture is at all times
evenly distributed. There is two
horsepower motor geared into a reduc-
ing gear and from this reducing gear
running to a shaft overhead Is a link
belt for driving the shaft on which are
the inter gears for running the agi-
tator, This is arranged for running
the agitators in both the iron and lime
solution tanks.
There is a lime orifice feed box To-
Gated on the floor over the solution
tank and in this feed box there is an
adjustable orifice, the discharge from
which is into the forebay There is an
overflow from the orifice box back to
the solution tank, and electric alarms
are attached to the orifice box to notify
operator If the lime is not feeding.
There are two centrifugal pumps con-
nected to electric motors the suction
OF which goes to the solution tanks and
the discharge to the orifice box. The
pumps are equipped with the necessary
valves for cutting out.
There are two iron solution tanks
and a dissolving box over tanks, hav-
ing a discharge into each. In the
bottom of the dissolving tank there is
a manifold for agitating the iron while
dissolving in the box are screens for
screening the solution before it reaches
the solution tanks. There is an agi-
tator in each iron tank driven by the
same shaft that drives the lime agi-
tators.
There is an iron feed box having
adjustable oriflces, the discharge from
which goes into the coagulating basins.
Two bronze centrifugal pumps, oper-
ated by electric motors, force the iron
solution to the orifice box An cleo
trio alarm on the feed box notifies the
operator if the iron is not feeding.
Each tank has an indicator which
shows at all times the height of solu-
tons in tanks.
Three Big Filters.
There are three filters twelve feet
and four inches wide by fourteen feet
and eight inches long, giving a total
area of $50 feet for each filter. One
bed is not yet equipped, but can be
fitted up on short notice should occa-
sion require. These filters have a ca
pacity of one half million gallons of
water daily each. The beds are
equipped with a manifold system as
follows Running across the center
or the bed at the bottom is a special
cast iron pipe radiating from which
on ten Inch centers are two-inch gall
yanized lateral pipes extending to
of the bed. These laterals are tapped
on the tap side every six inches to
receive the brass strainers. The end
of manifold system is bolted to oper-
ating valves, each filter being equipped
with 4OS patented strainers made of
spring bronze and having slotted open
ings There are thirty inches of spe-
cial prepared sand and ten inches of
graduated gravel in each filter bed.
Directly over the gravel is the Wilson
patented system of air wash which
consists OF two lines of air pipe laid
lengthwise of each bed while radiating
from these pipes four inches on center
are three eighth inch brass tubes
slotted every two and one-half inches
In washing a jet of air is injected
into the bed every two and one-half
by four inches in conjunction with
water On top Of partition walls are
cast iron overflow wash boxes made up
In sections and on the side of the boxes
are sand catcher boards to prevent
sand from washing away while same
is being cleansed At each filter theirs
is a butterfly valve with connections
to supply canal. These valves are
controlled by copper floats to keep
water at uniform height in filters
and are closed off automatically when
washing. There is a spreader on the
end of each butterfly valve to dis
tribute the water evenly over the beds
to prevent cutting the sand There
is an eight-inch double disk operating
valve at each filter and this valve is
connected to the main manifold system
in the bed and also has connections