propeller shaft.
f.
Propeller: The pump propeller shall be constructed of [bronze]
[_____] and shall be balanced statically and dynamically to reduce
vibration and wear.
g.
Propeller Shaft: The propeller shaft shall be sized to operate
without objectionable distortion or vibration in both forward and
reverse rotation. The propeller shaft shall be made of [stainless
steel] [_____] and be direct coupled to the line shaft. The
propeller shaft shall be adjustable with reference to the bowl.
The line shaft shall be constructed of [carbon steel] [_____] and
extend as one unit to the motor shaft. The line shaft shall be
enclosed in a water-tight steel column.
h.
Bearings: The pump shall have a [bronze] [_____] sleeve bearing
immediately above the propeller, and a [bronze] [_____] lower
support bearing below the propeller. For line shafts greater than
3 m 10 feet in length, [bronze] [_____] intermediate shaft
bearings shall also be provided. The intermediate shaft bearings
shall be inside the water-tight steel column. At the top of the
line shaft, a [bronze] [_____] tension bearing with a tension nut
and tension ring shall be included. All bearings shall be easily
replaceable and shall be spaced to provide adequate support for
the shaft and to prevent vibration. All bearings shall have an
L-10 life of 100,000 hours in accordance with ABMA 9 or ABMA 11.
i.
Lubrication: The pump shall be equipped with an automatic
lubricating system which shall supply grease lubricant to all but
the lower support bearings. The lower support bearings shall be
grease packed.
2.6.2.2
Submersible Centrifugal Pumps
The submersible centrifugal pumps used for the jet aeration system shall be
in accordance with Section 11310 PUMPS; SEWAGE AND SLUDGE.
2.6.2.3
Self-Priming Centrifugal Pumps
The self-priming centrifugal pumps used for the jet aeration system shall
be in accordance with Section 11310 PUMPS; SEWAGE AND SLUDGE.
2.6.2.4
Vertical Turbine Pumps
**************************************************************************
NOTE: Vertical turbine pump manufacturer design
manuals should be consulted to determine spacing of
pumps to avoid influence of the pump suctions.
**************************************************************************
The vertical turbine pumps used for the jet aeration system shall be in
accordance with Section 11212 PUMPS: WATER, VERTICAL TURBINE.
2.6.2.5
Pump Suction Screens
A [stainless steel] [_____] screen shall be mounted to the suction of the
pump. The screen shall allow nothing larger than 25 mm 1 inch in diameter
to pass.
SECTION 11391
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