self aligning and consist of a cast-iron pillow block set on adjustable
anchor plates. The bearings shall be grease lubricated and have a minimum
L-10 life of 100,000 hours in accordance with ABMA 9 or ABMA 11.
2.3.1.7
Protective Covering
The Contractor shall provide an [ultraviolet light protected fiberglass]
[_____] cover, extending over the length of each aeration unit. The cover
shall be designed to protect all adjacent structures from splashing caused
by the units. The cover shall be mounted independent of the aeration
equipment and be installed in accordance with the manufacturer's
requirements.
2.3.2
Drive System
2.3.2.1
Reducer
The drive system reducer shall be constructed to maintain alignment of
bearings and gearing while absorbing the external loads of the [disc] [or]
[rotor] assembly. The unit shall be designed to continuously withstand all
internal loadings developed at the full load motor wattage horsepower,
including motor starting torques up to 250 percent of motor running
torques. The unit shall also be designed to withstand all external
loadings produced by torque, out-of-balance and vibration resulting from
operating conditions. The speed reducer shall be provided with lifting
lugs. The interior of the gear case shall be vented by an approved
breather, constructed to retard the entrance of water vapor.
2.3.2.2
Housing
Drive housing shall be weatherproof and constructed of steel in
accordance
with ASTM A 36/A 36M or high grade cast-iron in accordance with
ASTM A 48/A
48M. A protective coating shall be applied that will not peel,
crack or
discolor at continuous operating temperatures up to 121 degrees
C 250
degrees F.
2.3.2.3
Rating
The drive gearing shall have a minimum service factor of at least [1.4]
[_____] times the rated brake horsepower of the drive motor. The gear
reduction system shall be suitable for continuous operation and moderate
shock loading in accordance with AGMA 6009 for gear motor reducers or gear
motors using helical and spiral bevel gears.
2.3.2.4
Bearings
Power transmission bearings shall be antifriction type and shall have a
minimum L-10 life of 100,000 hours at maximum operating speed in accordance
with ABMA 9 or ABMA 11. Bearings shall be fully sealed and protected from
water spray.
2.3.2.5
Lubrication
**************************************************************************
NOTE: If lubricating pumps are not used delete
subparagraph b. and edit accordingly.
**************************************************************************
a.
Lubrication shall be provided by [gears running in an oil bath]
SECTION 11391
Page 17
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