MIL-P-28501C(YD)
* 3.5.3 Pumping element, size 2. The size 2 pumping element shall be of the
vertical turbine type consisting of an impeller shaft, a stainless steel intake
screen, and a series of individual turbine type bowls threaded or bolted
together.
The bowls shall be bronze or close-grained cast iron having
smooth-finish interior surfaces and liquid passages, and shall be designed for
Impellers shall be statically balanced and securely
use in 6-inch well casing.
fastened to the shaft. A bronze bearing, a rubber bearing, Or a combination of
the two shall be provided in each bowl stage for each impeller and a main bronze
bearing, protected by seals and sand collars, when applicable, shall be provided
The impeller shaft shall be turned, ground,
at each end of the pumping element.
The discharge
stainless steel with not less than 12 percent chromium content.
The pump
connection and pump to motor adapter shall be cast or ductile iron.
shall be designed to withstand hydrostatic pressure equal to 1.5 times the pump
discharge pressure or the total dynamic head, whichever is greater (see
4.5.1.2).
Upthrust protection shall be provided in the bowl assembly.
A stainless steel splined or keyed coupling shall
3.5.4 Shaft coupling.
connect the pump assembly to the motor to provide a direct drive to the pump.
* 3.5.5 Surface plate . A 6-inch by 1-1/2-inch surface plate shall be
Each size 2 pump assembly shall be
furnished with each size 1 pump assembly.
The surface plate shall be
furnished with a 6-inch by 3-inch surface plate.
The seals shall have auxiliary openings of
provided with well and cable seals.
Discharge flange shall be flanged and rated for
proper size to fit the cable.
the maximum system pressure.
3.6 Electrical requirements.
The motor shall
3.6.1 Motors.
Electric motors shall conform to NEMA MG 1.
be of the submersible type, equipped with heavy-duty thrust bearing rated to
operate continuously at a thrust load equal to 90 percent of the maximum thrust
Size 1 and 2 pump electric
that the pump can impose under any head condition.
motors shall have a nameplate rating of 200 volts, alternating current (Vat),
3-phase, 60 Hertz, for operation on a 208 Vac supply.
Size 1 pump electric
The minimum hp for size 2 pump motor shall be
motor shall be a minimum of 5 hp.
30 hp and shall be designed for low voltage starting.
* 3.6.2 Motor controller.
Motor controller shall conform to NEMA ICS 1 and
All units shall be equipped with hand off-auto selector switch
NEMA ICS 2.
The starter shall be equipped with overload protection in
suitably enclosed.
all phases, low voltage motor protection, and shall be furnished with an
Size 1 units shall be equipped with an
enclosure in accordance with NEMA ICS 6.
Size 2 units shall be equipped for low
across-the-line magnetic starter.
voltage starting. When specified (see 6.2), extra-quick trip ambient
compensated overload relays shall be provided.
Unless otherwise specified (see 6.2), the electrical
3.6.3 Cable.
conductors shall conform to the applicable portions of NEMA WC 3, including the
requirements for portable multiple-conductor power cables.
All cables and cords
The cable shall be designed for heavy-duty,
shall be of round construction.
hard usage, and shall be resistant to ozone, sunlight, oils and solvents,
cracking, salt water, and physical abuse. The cable shall be designed to
operate continuously at a cable temperature of 194 degrees Fahrenheit (°F) in a
The voltage rating of all insulated
104°F ambient temperature environment.
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