Blower Size
Maximum Speed
(mm)
(Rpm)
175
1,370
200
1,200
Blower Size
Maximum Speed
(Inches)
(Rpm)
2
3,500
3
2,750
4
2,400
5
1,900
6
1,600
7
1,370
8
1,200
The V-belt drive shall include blower sheave, motor sheave, and V-belt.
Sheaves shall be cast steel and keyed to the shaft. Multiple belts shall
be used when necessary to transmit the required power. V-belt shall be of
a heavy-duty type, oil and heat resistant, and static dissipating. Drive
shall be designed to have minimum service factor of 1.5. Spare sheaves
shall be furnished to allow alternative operation at 75 percent of total
plant air requirements.
3.3.4
Air Blower and Blower Driver Housing
The blower-driver combination shall be mounted on a base plate with
spring-type vibration isolators in a weatherproof housing or equivalent
protective enclosure. The weatherproof housing shall be constructed of not
less than 1.5 mm 16 gage steel supported by the necessary structural
members to obtain rigidity. The housing shall provide easy access to
enclosed equipment through access doors, or the housing shall be large
enough to accommodate the above equipment with reasonable allowance for
servicing and adjustment of equipment. Doors shall be equipped with
locking devices. For proper air ventilation, air louvers shall be placed
with the enclosure on the blower and driver chamber side. When air filter
is to be placed in the housing it shall have louvers of adequate area for
both ventilation air and blower intake air movement. Base plate shall be
of welded steel or cast iron sized to carry the blower-driver combination
and shall have sufficient rigidity to maintain alignment between elements,
and shall be insulated against vibration. Base plate shall have provisions
for adjustment of V-belt tension, and shall be provided with necessary
anchor lugs for foundation bolts and lifting brackets. Housing shall be
designed for mounting either on the plate or on a concrete pad adjacent to
the plant.
3.3.5
Air Blower Accessories
3.3.5.1
Air Filter and Air Filter Gage
The air filter shall be of the filter-silencer type having a maximum
pressure loss of 25 mm 1.0 inch water gage (mm) (In.W.G.) at maximum
capacity of blower when clean. The silencing chamber shall have peak
attenuation in the frequency range 300-1, 1,200 cycles per second. The
filter media shall be composed of several layers of crimped zinc-coated
wire mesh. Filter shall be of the viscous type, coated with an adhesive,
or dry type. The filtered air shall have a dirt concentration of not more
than 0.5 mg per 28.4 cubic meters 0.5 milligram per 1,000 cubic feet of air
SECTION 11375N
Page 104
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