provided in the froth control system main line piping immediately adjacent
to the hose bibb branch on the downstream side.
3.4.2
Froth Control System Pump
Pump shall be a submersible pump or a centrifugal pump. Pump shall have a
capacity of furnishing approximately 0.13 L/s 2 gpm to each spray nozzle at
the necessary spray nozzle pressure to produce the desired spray pattern.
Pump shall be mounted in a fabricated steel well accessible from the top of
the top of the tank. A brass screen or strainer shall be provided on the
suction side of the pump.
3.4.2.1
Submersible Pump
The pump shall be of the self-priming, single-stage, single-suction,
centrifugal type and shall include casing, impeller seal and motor. Pump
and motor shall be in a common sealed casing and designed to be completely
submersible. The pump shall be oil-filled using the manufacturer's
standard lubricant to dissipate heat, lubricate bearings permanently, and
eliminate potentially moist air within the motor chamber. Pump shall be
manually controlled from the electrical control panel and shall be provided
with a three-conductor waterproof power cord of sufficient length.
a.
Pump: The impeller shaft shall be an extension of the motor
shaft. Casing shall be cast iron, ASTM A 48M ASTM A 48, Class 25
minimum, or ASTM A 126, Class B minimum. The casing shall be
equipped with a priming port and means for readily draining the
casing. The pump shall have removable wearing surfaces and bolted
plates or segmented sections. Impeller shall be bronze, ASTM B 62.
Impellers shall be cast in one piece, shall be balanced, and
shall be keyed, threaded, or press fit to the motor shaft in a
manner to provide positive locking against any rotative loosening
effect. Shaft shall be corrosion-resisting steel, ASTM A 276, Type
4l6, or other corrosion resisting steel equal or better than the
foregoing. The impeller and motor shall have a common shaft.
Shaft seal shall be mechanical type. The motor shall be provided
with antifriction lubricated-for-life, sealed bearings. The
bearings shall function on a continuous-duty basis while
supporting the maximum combined radial and thrust loads imposed by
the elements and hydraulic action of the pump.
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NOTE: Insert electrical power characteristics.
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b.
Pump Motor: Motor shall be constant speed, totally enclosed,
vertical type, conforming to NEMA MG 1. The motor shall be of
adequate wattage horsepower to drive the pump continuously at the
maximum load encountered under any operating condition without
overloading or exceeding the nameplate rating of the motor. Motor
shall be suitable for operation on [_____] volt, [_____] phase,
[_____] Hertz service. Motor shall be protected against overload,
low voltage, and unbalanced voltage.
3.4.2.2
Centrifugal Pump
Pump shall be vertical centrifugal motor driven type and shall include
casing, impeller, pump shaft, suspension pipe, discharge pipe, cover plate,
and motor. The pump shall be connected to the motor by a vertical shaft
SECTION 11375N
Page 107
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