shall be for Class II, Division 1, Group F hazardous location in accordance
with NFPA 70.
2.29.15
Coal Crusher
**************************************************************************
NOTE: The designer shall select the appropriate
type of crusher based on the throughput requirements
and an economic analysis.
**************************************************************************
Coal crusher shall be [roll crusher] [hammermill] [granulator] [impactor]
designed to reduce run-of-mine or lump coal to a maximum lump size of
[_____] mm inches. Crusher shall have a minimum capacity of [_____] metric
tons/hour tons/hour when handling average size bituminous coal. Housings
shall be made of heavy castings or welded heavy steel plate. Interior of
the housing shall have replaceable liners, constructed of abrasion
resistant steel. Breaker plate, grates, rolling rings, swing hammers, and
other parts of the unit subject to excessive wearing shall be replaceable.
Crusher shall have provisions to trap and reject hard foreign objects
without damaging the crusher. Shafts shall be forged, heat-treated alloy
steel with bearings mounted in dust-tight housings. Motor shall be
[totally enclosed, nonventilated type] [totally enclosed, fan-cooled type]
[totally enclosed, fan-cooled type suitable for installation in a Class II,
Division 1, Group F hazardous location in accordance with NFPA 70]. [Motor
starter shall be [manual] [[magnetic] [across-the-line] [reduced voltage
start]] type with [general-purpose] [weather-resistant] [water-tight]
[dust-tight] [explosion-proof] enclosure.]
2.29.16
Vibrating Feeders
Vibrating feeders shall be the [electromagnetic] [electromechanical]
[single input (Brute Force)] type with a capacity of 0 to [_____] metric
tons/hour tons/hour when handling coal weighing approximately 800 kg/cubic
meter 50 pcf and with maximum lump size of [_____] mm inches in diameter.
Feeder pans and skirts shall be replaceable [6.4] [9.5] [12.7] mm [1/4]
[3/8] [1/2] inch thick, Type 304 solid stainless steel plate without
liners. The feeder pan shall be fabricated [_____] mm inches in width,
[_____] mm inches in length and [_____] mm inches deep. Dust control
covers of 3.416 mm No. 10 gauge thick steel shall be provided for each
unit. [Two] [Four] rectangular poke holes ([one] [two] each side) shall be
provided with 6.4 mm 1/4 inch thick No. 304 stainless steel sliding covers.
All feeder parts coming in contact with coal shall be made of, or lined
with, Type 304 stainless steel. All feeders shall automatically compensate
for material headloads and weight effect to maintain a constant feed and
must not damper out when operating under full silos or bins. Slopes on pan
shall not exceed 10 degrees. The vibratory feeders shall be [foot]
[suspension] mounted and shall be completed with supports. Suspended
feeders shall be provided with safety cables. The feeders shall have their
drives located [above] [below] trough. The motors shall be [totally
enclosed, nonventilated type] [totally enclosed, fan-cooled type suitable
for installation in Class II, Division I, Group F hazardous location in
accordance with NFPA 70].
2.29.17
Tripper
The tripper shall be of steel construction, motor-propelled, automatically
reversible, or manually controlled. It shall be equipped with antifriction
bearings throughout, rolled or forged steel wheels, hand-operated rail
SECTION 15559A
Page 88
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