2.3.1.3
Velocity Baffles
The Contractor shall provide velocity baffles at the indicated locations
and alignment and in accordance with all structural and installation
requirements as recommended by the manufacturer of the aeration mechanism.
2.3.1.4
Splash Plates
**************************************************************************
NOTE: If outboard bearings are not required or if
they are designed to be wetted, or if protective
covering hoods include splash protection delete this
paragraph.
**************************************************************************
Fabricated [steel] [aluminum] [stainless steel] plates shall be mounted in
the vertical concrete walls at the drive assembly and outboard bearings and
shall be bolted to the frames as indicated. The opening in the wall formed
by the splash plate shall be of sufficient width for removal shafts. Where
the shaft passes through the splash plates a rubber gasket seal shall be
provided on both sides to seal water from the service area.
2.3.1.5
Disc and Rotor Immersion Requirements
**************************************************************************
NOTE: To maintain the water level within the
recommended range it is very important that the
effluent weir be sized properly and be manually
adjustable.
The immersion depth will vary with the diameter of
rotor selected. The depths indicated assume a
standard 1220 mm (48 inch) diameter unit.
**************************************************************************
To ensure the most efficient operation of the aeration system and to avoid
damage to the drive system the [discs shall be operated with a minimum
immersion of [300] [_____] mm [12] [_____] inches and a maximum immersion
of [535] [_____] mm [21] [_____] inches] [rotor blades shall be operated
with a minimum immersion of [100] [_____] mm [4] [_____] inches and a
maximum immersion of [355] [_____] mm [14] [_____] inches].
2.3.1.6
Shafts and Bearings
**************************************************************************
NOTE: There are no apparent mechanical or
operational advantages in stub shafts and continuous
through shafts. Different manufacturers market
different shafts. Check with potential
manufacturers before specifying shaft type.
Contractor should usually be allowed to use either
shaft.
**************************************************************************
The [disc] [or] [rotor] assembly shall be supported at both ends by a
shaft. The shaft shall be fabricated of steel conforming to ASTM A 36/A 36M.
The shaft shall be [solid steel] [a steel torque tube with a minimum 9.5
mm 0.375 inch wall thickness]. Each [disc] [or] [rotor] assembly shall be
furnished with support bearing assemblies. Bearings shall be waterproof,
SECTION 11391
Page 16
Previous Page
