vertical cylindrical section [_____] meters feet [_____] mm inches high.
Construct vertical cylindrical section of not less than 7.94 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 and immediately above ladder the bunker top shall contain
dusttight, weather tight access hatch of not less than 610 by 610 mm 24 by
24 inches. Shell and bottom plates shall be beveled for full 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: Contractor with whom contract is drawn shall
assume full responsibility for the design and final details of
construction of the steel coal bunker.
b.
Supports: Bunker shall be self supporting from four steel columns
which shall be supported from on top of a concrete foundation.
Concrete work shall be as specified in Section 03300N
CAST-IN-PLACE CONCRETE.
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 16360
SECONDARY UNIT SUBSTATIONS.
b.
Vibrators: Provide on the cone bottom of the coal bunker a heavy
duty pulsating magnet electric vibrator, semi-noiseless type,
complete with mounting plate. Provide one vibrator controller
panel arranged for mounting in wall mounted control panel. Panel
shall contain an "ON-OFF" switch, power control dial, fuses and
rectifier. Power supply to panel shall be 460 volt, single phase,
60 Hz current.
2.9.22
Stoker Surge Hoppers
Construct stoker surge hoppers dusttight approximately as indicated of 6 mm
1/4 inch, 410 stainless steel plate with structural stiffeners, to hold not
less than [_____] Mg tons of coal at a density of 800 kg per cubic meter 50
pounds per cubic foot. Connection transition between surge hopper
discharge chute and stoker hopper extension shall have bolted emergency
firing door of not less than 610 by 457 mm 24 by 18 inches which shall
contain a 150 by 150 mm 6 by 6 inch glass observation window. Connections
shall be dusttight.
SECTION 15502N
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