associated equipment.
2.9.19.5
Auxiliary Devices
Provide auxiliary devices required for the control functions indicated
above.
2.9.19.6
Name Plates
Provide laminated plastic name plates for devices on panel face.
2.9.19.7
Control Sequence
To ensure that coal does not back up during system startup or shutdown,
design the controls so that on startup, the last piece of equipment to
handle coal starts first and on shutdown, stops last.
2.9.19.8
Additional Controls
Provide as shown. These controls include local START and STOP pushbuttons
or three-position selector switches for the following:
a.
Belt feeders
b.
Rotary vane feeder
c.
Belt conveyor (at head pulley)
d.
Screw conveyors
[e.
Coal scale]
f.
EMERGENCY STOP pushbuttons which stop the entire system shall be
provided where indicated.
2.9.20
Multiple Belt Scrapers
Equip conveyor belts at the head pulley, with multiple belt scrapers.
Adequate room and service access shall be provided in the head chute design
for multiple cleaners. Provide a doctor blade on the face of the head
pulley to remove most of the carryback material and a torsion arm type
multiple blade cleaner to scrape and remove material that bypasses the
primary cleaner. Tail pulley takeups shall be provided with a plow to
protect against material being carried back between the belt and the
pulleys. Both cleaners and plows shall have features that enable the
operator to safely inspect and adjust blades. Dribble chutes shall be
designed to resist material buildup and shall be plastic lined. A
convenient dust tight door for clean out and inspection purposes shall be
provided 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
Welded construction, not less than [_____] meters feet in diameter with a
SECTION 15502N
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