b.
Bag Compartment: Of sufficient height to allow internal access by
maintenance personnel. Base of compartment shall include metal
platform supported by steel angle cross bracing. Platform shall
extend over entire base area of compartment. Sidewall of
compartment shall include a hinged access door with locking
handle. Door shall be gasketed and opening shall be a minimum of
762 mm high by 406 mm wide 30 inches high by 16 inches wide.
c.
Hopper Bottom: Conical having a slope angle of not greater than
45 degrees with a flanged outlet.
d.
Access Platform: With [stairs] [ladder] and safety handrail for
external mounting to filter housing. Mount platform at a height
to allow convenient access through hinged door located on bag
compartment sidewall. Platform floor area shall be not less than
1.40 square meter 15 square feet.
e.
Provide filter housing with required columns and cross bracing to
support structure from silo roof to discharge directly into silo.
This support shall be of sufficient height to allow convenient
installation of filter discharge gate.
2.11.14.3
Discharge Gate
Air cylinder operated swing disc type. A rotary feeder type gate
is not
acceptable. When in the open position, gate disc shall swing out
of the
path of material being discharged. Both gate disc and seal shall
be
replaceable. Include handhole on gate housing for easy access to
both disc
and seat.
2.11.14.4
Bag Cleaning Mechanism
Provide venturis, blow tubes, manifold, solenoid air valves, diaphragm
valves and differential pressure switch conveniently located at the filter
unit. Operation of these devices shall be on a sequential basis
(adjustable setting) to allow periodic surges of compressed air through the
filter venturi sections. Compressed air requirement for bag cleaning shall
not be greater than 7.08 standard L/s at 690 kPa (gage) 15 scfm at 100 psig.
2.11.14.5
Filter Bag Assemblies
Each shall include the filtering media, wire retainer and stainless steel
clamping device. Filter bag shall slide over retainer and both shall be
clamped to the venturi by a stainless steel common band clamp. Top portion
of retainer shall have the inside dimension equal to the mating venturi to
ensure a tight fit.
a.
Retainers: Cage type construction,
fabricated from No. 1018
rounds or equal, using minimum of 3
mm 1/8 inch diameter rounds on
vertical strands and 5 mm 3/16 inch
diameter rounds on horizontal
strands. Coat retainer with nickel
and zinc after completion of
fabrication.
b.
Filter Bags: Not less than 474 g per square meter 14 ounces per
square yard felted material. Provide felted polyester or dacron
bags when operating temperatures are below 135 degrees C 275
degrees F. Provide Nomex bags or bags of similar abrasion and
temperature resistant qualities when temperatures are above 135
SECTION 15501N
Page 101
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