Continuous 8-hour service
20,000
Continuous 24-hour service
40,000
Continuous 24-hour service
80,000
(extreme reliability)
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Constructed of steel alloys with a certified L-10 minimum rated life of
[20,000] [40,000] [80,000] hours under load conditions imposed by the
service. Rated and selected in accordance with ABMA 9 and ABMA 11.
Provide with dust-tight seals suitable for environment and lubricant
pressures encountered; cast ferrous metal housing, bolted-split pillow
block type where located within fan casings; grease lubricated with
provisions to prevent overheating due to excess lubricant; surface ball
check type grease supply fittings. Provide manual or automatic grease
pressure relief fittings visible from normal maintenance locations.
Include lubrication extension tubes where necessary to facilitate safe
maintenance during operation and fill tubes with lubricant prior to
equipment operation. Prelubricated, sealed, anti-friction bearings, which
conform to above specified materials and L-10 life requirements, may be
provided for fans requiring less than 0.37 kW 1/2 horsepower.
2.1.2.2
Sleeve Bearings
Premounted, self-aligning, continuous oil supply, single or double ring
lubricated, insert type, with suitable provisions for shaft expansion and
such thrust as may be imposed by service loads. Provide water cooling for
shaft surface speed exceeding 6.1 meters per second 1200 feet per minute.
Provide each sleeve bearing with approximately 473 mL 16 ounce capacity
constant level oiler and oil level gage. Include on sleeve bearing
submittal data: Bearing manufacturing source, type, lubricant, clearances,
"L/D" ratio, antifriction metal, belt angle, shaft speed, shaft critical
speed, Brinell hardness at journal, and shaft surface finish at journal in
micro-inches.
2.1.3
Motors and Motor Starters
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NOTE: The motor control requirements should be
coordinated with the Electrical Section and will
depend on field conditions. The following types of
motor starters should be used as a guide only. When
electrical power circuits to which ventilation and
exhaust equipment are connected are heavily loaded,
the full voltage across the line starting may result
in excessive voltage drop on the circuits.
Power (kW)
Voltage
Type Starter
Up to 5 1/2
208-230
Across-the-line magnetic
5 1/2 to 11
208-230
Across-the-line magnetic
part winding or wye
delta
11 to 22 3/8
460
Across-the-line
magnetic, part winding
or wye delta
Above 11
208-230
Part winding or wye
SECTION 15801N
Page 15
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