2.29.7
Track Hoppers
Track hoppers shall be standard double hopper design with a belt or
vibrating-type feeder as indicated. The hoppers shall have a capacity of
approximately [_____] metric tons tons and shall be constructed of not less
than 9.5 mm 3/8 inch thick, Type 304L stainless steel plates, with slopes
of not less than 55 degrees, and shall be stiffened with angles. The
hoppers may also be of ASTM A 36/A 36M mild steel, minimum 6.4 mm 1/4 inch
thick with replaceable liners 6.4 mm 1/4 inch thick, ASTM A 167, Type 304L
stainless steel. All rivets and field bolts inside the hopper shall have
flat heads. The hopper shall be suspended from the track girders by heavy
bolts and cast washers, or the sides shall be carried to the bottom of the
track and supported by flanges fastened to concrete ledge continuously
around the hopper with the concrete forming the top portion of hopper
sides. Track girders shall consist of wide flange beams conforming to the
AREMA Manual for loading plus impact. They shall be complete with bearing
plates, WF cross struts, and rail clips. Top of hopper shall be fitted
with properly sized sections of grating made with steel bars sized [_____]
by [_____] mm [_____] by [_____] inches, and cross rods [_____] mm inches
in diameter, to form openings [_____] mm inches square.
2.29.7.1
Hopper Gates
A rack-and-pinion gate shall be provided at each hopper outlet and shall be
a self-cleaning type. [Hand-] [Motor-] operated sliding plate shall be 9.5
mm 3/8 inch thick carbon steel, formed into the shape of a winged U. The
gate plate surface shall be completely protected by an overlapping liner of
3.2 mm 1/8 inch thick ASTM A 167, Type 304 stainless steel. The gate body
material, except for the dust cover, shall be of 4.5 mm 3/16 inch thick
ASTM A 167, Type 304L stainless steel where in contact with coal flow.
2.29.7.2
Hopper Feeders
The vibrating or belt feeders of manufacturer's standard design shall be
provided for the service required. Motor shall be [totally enclosed,
nonventilated] [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
[weather-resistant] [dust-tight] [explosion-proof] enclosure.]
2.29.8
Truck Hoppers
Truck hoppers shall be of standard double hopper design with a belt or
vibrating type feeder as indicated. The hoppers shall have a capacity of
approximately [_____] metric tons tons and shall be constructed of 9.5 mm
3/8 inch thick Type 304L stainless steel plates, minimum, with slopes of at
least 55 degrees, and shall be stiffened with 6.4 mm 1/4 inch angles,
minimum. The hopper may also be of ASTM A 36/A 36M mild steel, minimum 6.4
mm 1/4 inch thick, with replaceable liners 6.4 mm 1/4 inch thick, ASTM A 167,
Type 304L stainless steel. Rivets and field bolts inside the hopper shall
be flat-head type. The hopper shall be supported by a flange fastened to
the concrete ledge continuously around the hopper, with the concrete
forming the top portion of hopper sides. Top of hopper shall be fitted
with properly sized section of bar grating made with [_____] by [_____] mm
[_____] by [_____] inch mild steel bars and [_____] mm inch diameter cross
rods to form openings [_____] mm inches square. A supporting beam not less
than [_____] mm inches deep, [_____] kg/meter pounds/foot, in a wide flange
member, shall be provided under the grating.
SECTION 15559A
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