The following specifications cover the performance, design, construction, and installation of the floating aeration equipment.

Each aerator shall be capable of producing 3.0 lbs. of oxygen per nameplate horsepower per hour under normal conditions. Each ____ HP aerator shall be capable of pumping and mixing approximately 1,908,000 to 12,500,000 gallons per day (depending on horsepower) under normal conditions and continuous operation.

The aerator shall produce two or four (depending on horsepower) distinct mixing zones within the lagoon cell for complete mixing of the biomass.

The aerator shall have one-third of the liquid being pumped, directed into a high-pressure spray.  This spray shall be used for aeration, stripping gases from the liquid, and as a de-foaming spray.

The aerator shall have a synchronous belt drive system and shaft driven to allow the owner to vary the speed and performance of the aerator in the field.  A gear box or gear reducer shall not be used.

1. Motor shall comply with EPACT ’92 efficiency standards.
2. Service factor of 1.15 to 1.25 (depending on motor type), over the motor nameplate at 60 HZ.
3. Class F insulation.
4. Double shielded bearings with re-greasing provisions on the shaft end.
5. Motor shall be designed for 230 1-phase or 208, 230 or 460 volt, 3-phase operation.
6. Motor shall be IEEE Series 841, Hostile Duty, or aluminum motor.

Frame and Components shall be fabricated of 304-L stainless steel. A 304-L electrical conduit tray shall be provided for securing the electrical conduit. Stainless steel lifting lugs shall be provided for equipment lifting.

OPTIONAL (for an additional charge)  A NEMA 4 stainless steel electrical junction box shall be provided with power block, grounding lugs, and pre-wired to the motor.  The junction box shall allow the electrical contractor to terminate their power cable from the motor starter.

Floatation – to have the following features:

1. Floats shall be an expanded polystyrene core with a hybrid urethane coating.
2. Coating shall be impervious to diluted acids, alkalis and petroleum products.
3. Floats shall be covered with 304-L stainless steel expanded metal and designed to support the weight of two 240 lb. service technicians.

Impeller shall be of 304-L stainless steel construction capable of pumping approximately 1,908,000 to 12,500,000 gallons per day (depending on horsepower) under normal conditions and continuous operation.  The impeller shall be capable of pumping  1 ½” diameter solids.

Impeller shaft shall be 1.5” diameter, 17-4 PH 1150 stainless steel construction.

Turbo Blower shall be 6-blade, 304-L stainless steel construction, capable of injecting air into the wastewater stream without requiring a separate motor.

Bearings – to have the following features:

1. Top bearings to be maintenance free “Double Roller” pillow block, concentric lock bearings lubricated with a solid oil lubricant having a load range of 20,200 ft/lbs.
2. Bottom bearings to be maintenance free, Poly-Round Solution® or ALL-ROUND Solution® , pillow block bearings.

Drive system to be “Poly-Chain GT2® ”.  The toothed, synchronous belt is constructed of non-stretch material to prevent retensioning.

Inlet intake cage shall be of 304-L stainless steel construction and hinged for ease of cleaning.  A 1/4” stainless steel lifting chain shall be provided.

Motor Hood shall be of 304-l stainless steel construction.  The motor hood shall cover the motor, drive belt, and the “Double Roller” pillow block bearings.  The motor hood shall be hinged for ease of access to the above-mentioned parts with a safety-locking device installed to eliminate accidental closure of the motor hood.  The motor hood shall be constructed to prevent direct exposure to rain, sleet, snow, sun, and water spray.

The aerator shall be warranted for defects in materials and workmanship for the period of one year from date of start-up, or 18 months from date of shipment, whichever occurs first.