with flange angles continuously welded and gasketed. No makeshift repairs
or field patching to overcome leakage shall be permitted. Give casing
interior a 1.60 mm 1/16 inch thick coating of coal tar primer and enamel
conforming to SSPC PS 11.01.
2.11.4.6
Head Section
Construct of not less than 5 mm 3/16 inch thick commercial hot rolled mild
steel plate in heavy angle frame with split, hinged, and removable top
cover hood built of not less than 10 gage (3.42 mm0.1345 inch) commercial
hot rolled mild steel plate and flanged discharge throat built of not less
than 5 mm 3/16 inch commercial hot rolled mild steel plate. Design head
section to support the drive machinery and head bearings. Provide access
ladder and service platform conforming to applicable OSHA regulations as
indicated for providing proper service and maintenance of elevator.
2.11.4.7
Boot Section
Construct of not less than 5 mm 3/16 inch commercial hot rolled mild steel
plate in heavy angle frame with curved and renewable bottom plate and
renewable internal loading leg, both built of not less than 5 mm 3/16 inch
commercial hot rolled mild steel plate, and flanged inlet. Mount take-up
and foot terminal bearing on one side of the boot in a bolted removable
side panel so the foot shaft and sprocket may be removed through the side
of the door. Bolt end panels so they are removable for cleanout and
inspection.
2.11.4.8
Electric Motor
Totally enclosed, fan cooled, high torque, [_____] volt, three phase, 60
Hz, not less than [_____] kW hp as specified under paragraph entitled
"Motors and Drives" in this section, direct connected by means of flexible
coupling to a reduction gear unit having alloy steel herringbone or helical
gears and antifriction bearings enclosed in oiltight housing.
Provide an
adjustable base for motor and reduction gear unit. Drive from the output
speed shaft of the reduction gear to the elevator head shaft shall be by
means of finished steel roller chain conforming to ASME B29.1M running over
cut tooth sprockets conforming to ASME B29.1M complete with steel plate
chain guard. Roller chain attachments shall conform to ASME B29.1M.
2.11.4.9
Anchoring Brackets
Provide steel brackets as indicated at intervals for anchoring elevator to
increase rigidity.
2.11.4.10
Discharge Chute
Construct discharge chute to ash silo of not less than 10 mm 3/8 inch thick
steel plate.
2.11.5
Ash Storage Silo
[_____] meters feet in diameter with [_____] meters feet high walls with a
live bottom and flyash storage capacity of not less than [_____] Mg tons,
based on ash bulk density of 640 kg per cubic meter 40 pounds per cubic foot
for volumetric sizing. Structural joints shall be dusttight and
watertight. Provide columns, beams, bracing, and other structural members
as required for complete erection of silo and accessories. Live storage
capacity shall allow for 20 degree angle of repose from silo outlet.
SECTION 15502N
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