2.9.10.1
Body
Construct feeder body dusttight of not less than 12.7 mm 1/2 inch thick
formed carbon steel plate with 19.05 mm 3/4 inch thick flanges.
Continuously weld joints both inside and out. Top cover of feeder between
inlet and outlet flanges shall be removable to allow access to interior of
feeder. Provide hinged inspection doors in both sides of the outlet
section.
2.9.10.2
Feeder Vanes
Feeder section shall consist of not less than four vanes, equally spaced,
extending radially from drive shaft. Feeder section shall be not less than
457 mm 18 inches long and 457 mm 18 inches in diameter. Construct shaft of
turned and polished cold rolled steel mounted in externally flanged
babbitted type bearing blocks with forced lubrication type fittings.
Protect bearings with felt seal between bearing blocks and feeder body.
2.9.10.3
Drive Sprocket
Provide cast iron drive sprocket with chilled rims. Coordinate diameter
with drive motor and reduction gear for required feeder speed.
2.9.10.4
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. Motor shall be directly connected by
means of flexible coupling to a reduction gear unit having alloy steel
helical or herringbone gears and antifriction bearings enclosed in oiltight
housing. Provide an adjustable base for motor and reduction gear unit.
Drive from output speed shaft of the reduction gear to the conveyor 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.
2.9.11
Screw Conveyors
Provide each dusttight and furnished complete, with trough, screw, inlet
and discharge spouts, discharge gates, bearings, bearing hangers, dust
cover, electric motor, reduction gear, [service platform,] and supports.
2.9.11.1
Inlet and Discharge Spouts
Arrange as indicated. Spouts shall be flanged and square with opening
dimensions equal to inside diameter of trough.
2.9.11.2
Screw Trough
Provide dusttight screw trough with trough covers. Support trough by 6 mm
1/4 inch thick steel plate feet at not less than 3 meters 10 foot
intervals. Individual trough sections shall not be greater than 3 meters
10 feet long with steel angle end flanged connections.
2.9.11.3
Bearings and Hangers
Provide thrust bearings and trough end dust seals for both drive and tail
bearings. Thrust bearings shall be bronze in antifriction pillow blocks.
SECTION 15502N
Page 107
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