with a flexible coupling, or by a thrust-carrying solid shaft motor with a
rigid coupling, or the connection may be made by use of a thrust-carrying
hollow shaft motor. Pump shall be manually controlled from the electrical
control panel.
a.
Pump: Casing shall be cast iron, ASTM A 48M ASTM A 48, Class 25
minimum, or ASTM A 126, Class B, minimum. Impeller shall be
bronze, ASTM B 62 or ASTM B 584. The impeller shall have ample
water passages, be mechanically balanced, and keyed and locked or
otherwise securely fastened to the pump shaft to prevent
backing-off or loosening with change of rotation. The mechanical
properties and diameter of the shaft shall be such as to insure
that neither whip, deflection, nor vibration will be of such
magnitude under normal operating conditions to impose loads on the
shaft bearings greater than the design loads. Means shall be
provided on that part of the shaft extending above the cover plate
for adjustment of the clearance between the impeller and the inner
surfaces of the volute section. Suspension pipe shall be of heavy
wrought steel tubing or cast iron pipe and shall have ample
strength and rigidity. Suspension pipe flanges shall be suitably
machined or doweled to insure proper alignment of the pump and
shaft. Discharge pipe shall be of wrought steel having a wall
thickness not less than that specified in ASTM A 53 for schedule
40 pipe. The discharge end of the pipe shall terminate in a
threaded connection of pipe size in accordance with the
manufacturer's standard practice. The sump cover plate shall be
located to carry mechanical and hydraulic thrust loads of rotating
components shall be furnished. Thrust bearings shall be located
above the pump-mounting plate or cover and fitted with a
moisture-proof seal. Intermediate shaft and lower bearings shall
be of the sleeve type. Sleeve type bearings shall be heavy-duty
bronze, carbon, or molded plastic-lined. Lubrication fittings
shall be located in accessible, protected positions. A bright red
mark shall be painted at each lubricating point.
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NOTE: Insert electrical power characteristics.
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b.
Motor: Motor shall be constant speed, totally enclosed, vertical
type, suitable for outdoor service, and conforming to NEMA MG 1.
The motor shall be of adequate wattage horsepower to drive the
equipment continuously at the maximum load encountered under any
operating conditions without overloading or exceeding the
nameplate rating of the motor. Motor shall be suitable for
operation on [_____] volts, [_____] phase, [_____] Hertz service.
Motor shall be protected against overload, low voltage, and
unbalanced voltage. The motor shall be mounted on a steel or cast
iron stand of substantial construction to ensure correct alignment
of motor and pump.
3.4.3
Spray Nozzles
Spray nozzles shall be of the self-cleaning, hinged, counterweighted type
that will produce a sharp flat spray at normal pumping rates. The spray
nozzle shall be of non-clog and non-freeze design and have a minimum
orifice of 6 mm 1/4 inch diameter. Spray nozzles shall be self-cleaning,
and shall be made of corrosion-resisting materials and shall be adjustable
SECTION 11375N
Page 108
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