2.5.3.5
Lubrication
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NOTE: If lubricating pumps are not used delete
subparagraph b. and edit accordingly.
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a.
Lubrication shall be provided by [gears running in an oil bath]
[an oil slinger] [pumps]. Drive shall be provided with an oil
"dam" or other means of positive protection against lubricant
leakage around the output shaft. An oil level gauge or sight
glass and drain fittings shall also be provided. The thermal
rating of the gear reducer shall exceed the design load or proper
cooling shall be provided.
b.
Lubricating pumps shall be removable for maintenance without
disassembly of the drive and/or removal of the motor. Either a
low pressure or low oil level switch shall be provided to shut off
the unit in the event of insufficient lubrication.
2.5.3.6
Power transmission from the motor to the gear reduction system shall be
supplied by a nonlubricated coupling, direct driven. Couplings shall be
the manufacturer's standard and shall be selected to provide a minimum
service factor of 2.0.
2.5.4
Draft Tube
Each draft tube shall consist of upper and lower sections of epoxy coated
steel. The upper section shall consist of the suction cone, supports for
connection to the turbine support assembly, air distribution assembly,
deflection limiting system, flow direction baffles, and supports for
connection to the bottom section. The bottom section shall be [_____] mm
feet long, sufficient to carry the design flow with minimal pressure drop.
Bottom section shall be shaped to carry the wastewater to a sufficient
depth to dissolve the required oxygen and direct the flow forward in the
channel. The draft tube shall be [_____] mm inches in diameter with a 6 mm
1/4 inch minimum wall thickness, and shall be equipped with grout rings as
shown.
2.5.5
Mounting
A [structural bridge of steel conforming to ASTM A 36/A 36M] [concrete
bridge] and support assembly designed to mount each aerator shall be
constructed as indicated. The bridge assembly shall be sufficient to
support the turbine aerator, suction cone, air sparge assembly and the flow
directional baffle assembly.
2.5.6
Air Supply Equipment
The blower shall conform to Section 11375A AIR SUPPLY AND DIFFUSION
EQUIPMENT FOR SEWAGE TREATMENT.
2.6
JET AERATION
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NOTE: Jet aeration systems require that preliminary
SECTION 11391
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