designer. Only the paragraphs applying to the
selected system should be left and the others
removed. However, if the disc and rotor option is
selected note that these aerators can normally be
substituted, one for the other, in the same basin
configuration so that both disc and rotors may be
specified.
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2.3.1
Aeration Mechanism
The [disc] [or] [rotor] aeration system shall be provided as indicated.
The units shall be complete and include [disc] [or] [rotor] assemblies,
shaft, or torque tube, drive unit, bearings, supports and all appurtenances
necessary for the proper operation of the equipment. The [disc] [or]
[rotor] aeration system shall be designed for continuous operation.
2.3.1.1
Disc Assembly
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NOTE: Twelve individual discs or rotors in an
assembly are typical. The diameter of the unit is
variable and should be designed based upon basin
configuration, oxygen transfer rates, velocity and
efficiency requirements.
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Each assembly shall contain individual molded [plastic] [fiberglass] discs,
[_____] mm inches in diameter and mounted not less than 150 mm 6 inches on
center. The number and spacing of disc assemblies shall be provided as
indicated. The disc assemblies shall be secured to the shaft with a clamp
ring, by using a keyed shaft or by another method that will hold the
assembly tightly, ensure no slippage, and provide continuous proper
alignment. The discs shall be split into two sections for attachment or
removal without disassembling the shafting. Stainless steel positioning
bolts shall be supplied to hold the two halves together on the shaft.
2.3.1.2
Rotor Assembly
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NOTE: Twelve individual discs or rotors in an
assembly are typical. The diameter of the unit is
variable and should be designed based upon basin
configuration, oxygen transfer rates, velocity and
efficiency requirements.
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Each blade assembly shall consist of [12] [_____] individual or six dual
[stainless steel] [plastic] [epoxy coated steel] [hot-dipped galvanized
steel] blades, [_____] mm inches in diameter and mounted not less than 150
mm 6 inches on center. The number and spacing of rotor assemblies shall be
provided as indicated. The blade assemblies shall be secured to the shaft
with a clamp ring, by using a keyed shaft, by compression between the
assembly blades and the shaft or by another method that will hold the
assembly tightly, ensure no slippage, and provide continuous proper
alignment. The blades shall be removable by unbolting. Welding blades to
the shaft will not be permitted.
SECTION 11391
Page 15
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