Screw Conveyors (Cont.)

CONVEYOR NO. 1

CONVEYOR NO. 2

Motor horsepower

[_____] hp

Screw flight thickness

[_____] inches

Trough thickness

[_____] inches

Trough cover thickness

[_____] inches

Trough end plate thickness [_____] inches

[_____] inches

Maximum speed

[_____] rpm

a.

Inlet and Discharge Spouts: Arrange as indicated. Spouts shall

be flanged and square with opening dimensions equal to inside

diameter of trough.

b.

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 meter 10 foot intervals. Individual trough sections shall

not be greater than 3 meters 10 feet long with steel angle end

flanged connections.

c.

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. Screw hanger bearings shall

be babitted-type, with cast iron hangers having removable bearing

caps held in place by a U-bolt. Design hangers to fit inside the

conveyor trough and equip bearings for grease lubrication with

grease fittings penetrating dust cover to allow bearings to be

greased without removing dust cover. Hangers shall not be located

at trough joints, feed, or discharge openings. Locate hangers at

not less than [3.66 meter12 foot intervals for screw diameters

larger than 250 mm 10 inches] [and] [3 meter10 foot intervals for

screw diameters 250 mm 10 inchesin diameter and smaller].

d.

Conveyor Screws and Couplings: Construct conveyor screws of

helocoid-type flights and connect with cold rolled steel

couplings. Assemble conveyor screws so that at the hangers there

is 180 degrees rotation between flight ends of each adjacent screw

section. Screw flight shall end over last discharge spout so bare

pipe extends across this area to prevent material carry-over.

e.

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." Install

motor at discharge end of conveyor. Motor shall be supported by a

unit bracket attached to the screw conveyor trough end plate and

connected to reduction gear through a V-belt drive. Reduction

gear shall be shaft mounted, double reduction type mounted

directly on the conveyor shaft. Provide tie rods, when required,

to prevent reduction gear rotation and for adjusting belt tension.

f.

Service Platforms: Conform to OSHA regulations as indicated to

properly maintain and service conveyor drive unit.

SECTION 15501N

Page 112