inches.
Bucket spacing shall not be greater than [_____] mm inches.
2.9.10.4
Backstop
Differential band brake type, cam type or internal type to prevent reversal
of chain and buckets in case of power failure.
2.9.10.5
Elevator Casing
Not less than [_____] by [_____] mm inches inside of not less than [_____]
[gage] [mminch thick] commercial hot rolled mild steel plate with 50 by 50
by 6 mm 2 by 2 by 1/4 inch corner angles for full height of elevator
casing. Construct casing in standard sections from 3048 to 3658 mm 10 to
12 feet high with 50 by 50 by 6 mm 2 by 2 by 1/4 inch angle flanges at the
end of each section. Provide a hinged inspection door not less than 610 by
760 mm 24 by 30 inches in the section immediately above the boot section
[and where indicated]. Casing and inspection doors shall be of dust-tight
construction with flange angles continuously welded and gasketed. No
makeshift repairs or field patching to overcome leakage shall be permitted.
Casing interior shall be given a 1.60 mm 1/16 inch thick coating of coal
tar primer and enamel in accordance with SSPC PS 11.01.
2.9.10.6
Head Section
Not less than [_____] mm inch thick commercial hot rolled mild steel plate
in heavy angle frame with split, hinged, and removable top cover hood.
Construct hood of not less than [_____] mm inch thick commercial hot rolled
mild steel plate with flanged discharge throat built of not less than
[_____] mm inch thick commercial hot rolled mild steel plate. Design head
section to support drive machinery and head bearings. Provide maintenance
access ladder and platform conforming to applicable OSHA regulations [as
indicated].
2.9.10.7
Boot Section
Not less than [_____] mm inch thick commercial hot rolled mild steel plate
in heavy rolled mild steel plate in heavy angle frame with curved and
renewable bottom plate built of not less than [_____] mm inch thick
commercial hot rolled mild steel plate, and flanged inlet. Mount take up
and foot terminal bearing on one side of boot in a bolted removable side
panel so foot shaft and [sprocket] [sprockets] may be removed through side
of door. Bolt end panels so they are removable for cleanout and inspection.
2.9.10.8
Electric Motor
Totally enclosed, fan cooled, high torque, [_____] volt, three phase, 60 Hz
not less than [_____] kW hp, as specified in paragraph entitled "Motors and
Drives." Motor shall be direct connected by means of flexible coupling to
a reduction gear.
2.9.10.9
Reduction Gear
Alloy steel herringbone or helical gear type enclosed in oiltight housing.
Provide an adjustable base for motor and reduction gear unit. Drive from
the output shaft of the reduction gear to the elevator head shaft shall be
by means of standard finished steel roller chain running over cut tooth
sprockets, both conforming to ASME B29.1M and complete with steel plate
chain guard. Roller chain attachments shall also conform to
ASME B29.1M. Properly tension drive chain.
SECTION 15501N
Page 80
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