rotating members shall not be considered acceptable or equal.
2.2.3.5
Lubricant Housing
An oil housing shall be provided with oil, as recommended by the pump
manufacturer, to lubricate the shaft sealing system and to dissipate the
heat generated by the motor and bearings.
2.2.3.6
Impeller
The impeller design and manufacture shall be the manufacturer's standard.
The impeller surface shall be smooth, without holes and fabrication
offsets. The attachments to shaft shall be with keys or other fasteners
which are to be made of stainless steel. The attachment should be of
sturdy construction designed to not loosen, but be easily removed for
maintenance. The impeller construction may be cast or fabricated. At the
time of assembly the impeller clearances shall be those shown on assembly
drawings and may be checked in the field or at the factory at the
Contracting Officer's option. The impeller shall be balanced at the design
operating speed. The standard balance quality grade is G6.3 in accordance
with ANSI S2.19. Balancing procedure shall be in accordance with HI 9.6.4,
except that a two-plane balance shall be required.
2.2.3.7
Shaft
The shaft shall be [one piece integral with the motor] [two piece with gear
reduction] of high-strength cold-rolled carbon steel or stainless steel
with a factor of safety of five measured against the ultimate strength.
The shaft shall be designed for all torque conditions during normal
operation and for runaway speed during reverse flow.
2.2.3.8
Bowl Assembly
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NOTE: This portion of the pump is composed of the
venturi section and consists of the suction bell,
pump bowl, and discharge bowl. The entire unit acts
as a venturi to hydraulically guide and stabilize
the flow as it passes through the pump. Heads and
stresses are low, and its major design consideration
would be rugged, reliable, and long-lived materials.
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The bowl assembly may be of cast or fabricated manufacture. The hydraulic
design shall be the manufacturer's standard design as used in previous
operating installations. The general manufacture quality relating to
flange design, drilling, bolts, alignments, etc., shall be in accordance
with industry standard practice.
2.2.4
Motor
The motor shall be submersible and conform to the requirements of NEMA MG 1.
The motor shall be sized to avoid overload when operating at any point
along the characteristic curve of the pump. The motors shall be 3-phase,
60-Hz, [_____] V, squirrel cage induction type, NEMA Design B Type. The
stator windings and stator leads shall be insulated with a
moisture-resistant Class F insulation with temperature resistance of 155
degrees C. 311 degrees F. The service factor shall be 1.0. The
temperature rise above ambient for continuous full load rated conditions
SECTION 15132A
Page 21
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