TM 5-818-5/AFM 88-5, Chap 6/NAVFAC P-418
test pump is removed. A solution of calcium hypochlo-
tractor shall have at the jobsite five new complete die-
rate (HTH) shall be mixed with water in a tank (mini-
sel power units. During the pumping period, the
mum capacity of 3000 gallons to obtain a 1000-parts-
Contractor shall have a minimum of five (new or re-
per-million chlorine solution). (Fifteen pounds of (dry)
manufactured) diesel power units, complete with all
70 percent calcium hypochlorite will make 1000 gal-
components, available as standby. The Contractor
lons of 1000-parts-per-million chlorine solution.) A
shall also keep in stock on the jobsite other miscellane-
minimum of 30 gallons per foot of screen shall be
ous spare parts essential to routine maintenance of the
pumped into the well through a hose extended to the
engines, pumps, gear heads, flexible couplings, valves,
bottom of the well. As the chlorine solution is pumped
etc., as considered appropriate and approved by the
into the well, the hose shall be withdrawn at a rate
C.O.R.
which will insure that the chlorine solution is added
(c) Pumps. Deep-well turbine pumps, similar or
uniformly from the bottom of the well to a point 10
equivalent to such pumps manufactured by Layne-
feet above the top of the well screen. The chlorine solu-
Bowler, Fairbanks-Morse, Johnston, Jacuzzi, or other
tion in the well shall then be surged with a loose fitting
qualified pump manufacturer, shall be designed for
surge block for 1 hour. The permanent dewatering
pumping clear water at a rated capacity of 1500 gal-
pump shall then be immediately installed, and the well
lons per minute at a total dynamic head of 200 feet
pumped until the chlorine is essentially removed. (If it
and pump speed of 1800 revolutions per minute with a
is not possible to promptly install, the permanent
bowl efficiency of about 80 percent. The pump bowl as-
pump, the chlorine should be allowed to set 3 or 4
sembly shall be of close-grained cast iron porcelain
hours, and the well pumped by some means to remove
enamel-coated inside and fitted with replaceable
the chlorine.) If the permanent pump is subsequently
bronze wear rings and sleeve-type shaft bushings. Im-
installed, the well and pump shall be rechlorinated as
pellers shall be cast iron or bronze and designed for
described above except the surging shall be omitted.
nonoverloading. The bowl shaft shall be high-chrome
stainless steel of sufficient diameter to transmit the
(6) Equipment and materials.
(a) Quality. All installed equipment and mate-
pump horsepower with a liberal safety factor and rig-
idly support the impellers between the bowl or case
rials shall be new except the discharge header system
which may be either new or "like new" used pipe.
bearings. The pump column assembly shall consist of
(b) Power units. Each of the 64 deep wells shall
thirteen lo-foot sections of lo-inch steel threaded pipe
be equipped with a direct drive diesel power unit. The
with line pipe couplings. Bronze spiders with rubber
engines shall be certified to produce a minimum of 115
bearings shall align the shaft bearings in each section.
continuous net horsepower at 1800 revolutions per
Line shafts shall be of Grade 1045 (ASTM A 108) steel
minute to the gear drive and shall be a Caterpillar
ground and polished with Type 304 (ASTM A 743)
Model 3304 T, Detroit Diesel Model 4-71N, or equiva-
stainless steel sleeves to act as a journal for each rub-
lent as approved by the Contracting Officer. The unit
ber line shaft bearing. A lo-foot section of lo-inch
shall be skid mounted with clutch power takeoff, have
threaded suction pipe shall be screwed into the bottom
hood and side panels, fan shroud, muffler, high tem-
of the pump bowl, The discharge head shall be provid-
perature and low oil pressure shutdown, battery, and
ed for mounting the gear drive and supporting the
fuel supply. Any additional item to make the unit
pump columns, bowls, and suction pipe. The design
function on a continuous 24-hour-per-day operation
shall permit the drive shaft to be coupled about the
shall also be included. Engines shall be operated with-
stuffing box to facilitate easy removal and replace-
in the revolution-per-minute limits of the manufactur-
ment of the driver. The stuffing box shall be of the
er's recommendations. The unit shall be leveled and
deep bore type with a minimum of six rings of packing
mounted on a 6-inch-thick concrete base. Prior to oper-
and a steel case. The packing gland shall be the bronze
ation, each unit shall be started and serviced by a
split-type and secured with stainless steel studs and
manufacturer's factory trained representative, or
silicone bronze nuts.
equally qualified mechanic. The power units shall be
(d) Gear drive and flexible coupling. A right
operated and maintained in accordance with the
angle gear drive with a gear ratio of 1:l shall be in-
manufacturer's recommendations. Each power unit
stalled on each pump. Horsepower rating shall be
shall have an independent fuel tank with a capacity of
based on American Gear Manufacturers Association
at least 500 gallons. Fuel lines shall be provided with
standards for spiral bevel gears. Ball and roller bear-
an approved screen or filter and shall be attached to
ings shall have a capacity to carry the horsepower and
the tank so that rain or contaminants may not enter
thrust loads for a minimum of 20,000 hours. The hous-
the tank. The tank shall be properly vented and
ing shall be a rigid semisteel casting properly propor-
equipped with a drain plus and filler port. All fuel
tioned to insure correct alignment of the gears under
tanks shall be new and cleaned prior to being placed in
full load. Case-hardened spiral bevel gears shall be
service. At the commencement of pumping, the Con-
held in position by antifriction bearings selected to
G-15
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