2.9.16
Track and Reclaim Hopper Valves
Dusttight, double rack and pinion type, with water collecting trough.
Valve shall have inlet opening not less than [_____] by [_____] mm inches
in direction of gate travel with a larger outlet opening. Inlet and outlet
shall be flanged and constructed of mild steel.
2.9.16.1
Valve Body
Not less than 10 mm 3/8 inch thick mild steel continuously welded both
internally and externally and lined with 11 gage (3.04 mm0.1196 inch) 410
stainless steel plate where body comes in direct contact with coal.
Construct inlet skirt of not less than 6 mm 1/4 inch thick 410 stainless
steel with outlet body plates constructed of 10 mm 3/8 inch thick mild
steel lined with 11 gage (3.04 mm0.1196 inch) 410 stainless steel plate.
Construct water collecting trough of not less than 11 gage (3.04 mm0.1196
inch) 410 stainless steel plate and containing water sprays for flushing.
Valve body shall have dust-tight steel gate assembly cover with molded
gasket for removal of gate without removing the coal valve. Provide a
hinged access panel not less than [_____] by [_____] mm inches in the
direction of gate travel with compression-type latches over water
collecting trough for removing obstructions.
2.9.16.2
Valve Gate
Slope gate plate toward water collecting trough and mount it on large ball
bearing rollers with 16 gage (1.52 mm0.0598 inch) stainless steel shells
equipped with felt grease seals and stainless steel grease retainers.
Provide rollers with grease fittings extended through valve body for
pressure lubrication. Gate shall be U-shaped with ladder racks on both
sides and shall be constructed of not less than 15.90 mm 5/8 inch thick
mild steel lined with 11 gage (3.04 mm0.1196 inch) 410 stainless steel
plate. Gate design shall be such that supporting rollers, racks, and
pinions are located completely out of coal stream. Racks shall be cold
formed and self-cleaning, with stainless steel, self cleaning pinions over
racks.
2.9.16.3
Operating Shaft
Mount operating shaft in ball bearings with felt seals, stainless steel
shells, stainless steel grease retainers, and grease fittings. Mount a
reduction gear on the gate shaft and provide an ample gate clearance pocket
in the body to ensure ease of operation through a standing column of coal.
Handwheel for operating valve shall be not less than 457 mm 18 inches in
diameter.
2.9.17
Chutes
Construct coal chutes dusttight as indicated of not less than 6 mm 1/4 inch
thick 410 stainless steel plate. Weld chutes with flanges located as
indicated to facilitate equipment and chute section removal. Flanges shall
be not less than 10 mm 3/8 inch thick steel and gasketed to maintain
dust-tight seal. Provide poke holes and access panels where indicated.
2.9.18
Coal Presence Indicators and Equipment Response Switches
May be of the following types and shall be interlocked with coal handling
controls to indicate equipment failures, coal stoppages, and provide for a
semi-automatic system. Enclosures for components shall meet requirements
SECTION 15501N
Page 88
Previous Page
