2.9.20
Multiple Belt Scrapers
Equip conveyor belts at the head pulley, with multiple belt scrapers.
Provide adequate room and service access in head chute design for multiple
cleaners. Provide a doctor blade on face of head pulley to remove most of
the carryback material and a torsion arm type multiple blade cleaner to
scrape and remove material that bypasses primary cleaner. Provide tail
pulley takeups with a plow to protect against material being carried back
between belt and pulleys. Both cleaners and plows shall have features that
enable the operator to safely inspect and adjust the blades. Dribble
chutes shall be designed to resist material buildup and shall be plastic
lined. Provide a convenient dust tight door for clean out and inspection
purposes on each side of the dribble chute.
2.9.21
Steel Coal Bunker
Cylindrical shaped type having a storage capacity of not less than [_____]
Mg tons of coal having a density of 800 kg per cubic meter 50 pounds per
cubic foot.
2.9.21.1
Construction
All welded construction, not less than [_____] meters feet in diameter with
a vertical cylindrical section [_____] meters feet [_____] mm inches high.
Construct vertical cylindrical section of not less than 7.90 mm 5/16 inch
thick steel plate. Slope bottom cone shaped hopper section at not less
than 55 degrees and fabricate from not less than 10 mm 3/8 inch thick 410
stainless steel plate. Top of bunker shall be conical 35 degree sloped
structurally reinforced 6 mm 1/4 inch thick steel plate. Provide ladder
inside bunker. Provide dusttight, weather tight access hatch of not less
than 610 by 610 mm 24 by 24 inches in bunker top immediately above ladder.
Shell and bottom plates shall be beveled for full penetration butt weld on
inside of bunker and a finish weld on outside of bunker. Provide bunker
with flanged outlet drilled to match inlet of gate.
a.
Responsibility: Ensure that full responsibility for final design
and details of construction of steel coal bunker is assumed by the
manufacturer.
b.
Supports: Bunker shall be self supporting from four stub columns
which shall be supported from on top horizontal structural steel
framing. Structural steel framing for supporting the stub columns
is specified in Section 05120 STRUCTURAL STEEL.
c.
Liner: Surface blast vertical inside surfaces of the bunker to a
near white metal, and then coat with 6 mm 1/4 inch thick
troweled-on heavy duty three compound corrosion resistant liner
consisting of a resin, a hardener and graphite aggregate. Liner
shall have an operating temperature limitation of not less than 66
degrees C 150 degrees F.
2.9.21.2
Accessories:
a.
Alarm Switches: Provide bunker with two automatic bin level
indicators with neoprene rubber diaphragm and a single pole,
double throw switch mounted in explosion proof aluminum housing to
signal high and low level alarms. Provide mounting plates on
bunker shell and holes for installation of indicator housing on
outside of bunker. Wiring shall be as specified in Division 16.
SECTION 15501N
Page 93
Previous Page
