2.5.10
Speed Reducers Gears and Drive Shaft
**************************************************************************
NOTE: Double reduction gear reducer should be
considered where low noise requirement is a factor.
**************************************************************************
Speed reducer gears shall be rated in accordance with CTI Std-111. Gear
reducers shall be of the [spiral bevel, single reduction] [spiral or
helical, double reduction] type. Reducer shall be mounted in accordance
with manufacturer's recommendations. Each reducer shall be provided with
an oil level cutoff switch interlocked to the fan motor. Each reducer
shall be provided with an oil level sight glass, fill, drain, and vent
lines located in a readily accessible position. Drive shafts shall be the
full floating type with flexible couplings at both ends and have a service
factor of 1.0 or greater. Drive shafts shall be of stainless steel, fitted
each end with flexible couplings (stainless steel plate type). Each drive
shaft shall be provided with a galvanized steel guard, to prevent damage to
surrounding equipment in case of shaft failure. Provision shall be made
for lubrication of all bearings. Bearings shall be accessible to the
extent that each bearing can be lubricated without dismantling fan.
2.5.11
Fan Motors
**************************************************************************
NOTE: Delete the last sentence if inapplicable.
**************************************************************************
Each motor shall be a [single speed] [two speed], totally enclosed,
insulation Class B, NEMA Design B, continuous-rated type which conforms to
NEMA MG 1. Fan motors shall have [open] [dripproof] [totally enclosed]
[explosion proof] enclosures and be located outside the discharge
airstream. Motors shall be mounted according to manufacturer's
recommendations. [Two-speed motors shall have a single winding with
variable torque characteristics.]
2.5.12
Code Water Basin
**************************************************************************
NOTE: Delete the bracketed sentences at the end of
the paragraph if a field-erected type tower is not
specified.
**************************************************************************
Basin shall be completely watertight and constructed of [zinc-coated steel]
[Type 304 stainless steel] [high density, air-entrained concrete] [FRP] [36
mm 1-1/2 inch tongue and groove lumber]. Basin shall be constructed and
installed to ensure that air will not be entrained in outlets when
operating and no water will overflow on shutdown. Each individual sump
shall be provided with an individual outlet. Each outlet shall be provided
with a 1/2 inch mesh, zinc-coated steel wire securely mounted to prevent
trash from entering the outlet. Each basin shall be provided with overflow
and valved drain connections. Each basin shall be provided with a
float-controlled, makeup water valve as indicated. The makeup water shall
discharge not less than 50 mm 2 inches or two pipe diameters, whichever is
greater, above the top of the basin. [Basin floor slab shall be made in a
continuous pour. A continuous water-stop stripping of molded polyvinyl
plastic (150 mm 6 inch dumbbell) shall be located on the centerline
position of the basin wall section/floor slab intersection, and at all
SECTION 15645A
Page 14
Previous Page
