a.
Upper Gas Plenum: Dished head, with flanged inlet and discharge
connections, tube sheet, venturis and blow tubes. These
appurtenances shall be welded airtight. Venturis shall be
fabricated from carbon steel having a minimum thickness of 16
gage.
Minimum centerline spacing between venturis shall be 191 mm
7 1/2 inches. A series of blow tubes shall be employed over the
venturis. Each tube shall extend through the wall of the dished
housing and be manifolded externally. Include support of external
manifold.
b.
Bag Compartment: Of sufficient height to allow internal access by
maintenance personnel. Base of this compartment shall include a
metal platform supported by steel angle cross bracing. Platform
shall extend over the entire base area of the compartment.
Sidewall of this compartment shall include a hinged access door
with locking handle. Door shall be gasketed and the 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 the filter housing. Mount platform at a
height to allow convenient access through the hinged door located
on the 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 the silo roof to discharge directly into
the silo. This support shall be of sufficient height to allow
convenient installation of the filter discharge gate.
2.12.14.3
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. A handhole shall be included on the gate housing for easy
access to both disc and seat.
2.12.14.4
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
be not greater than 7.08 cubic meter per second at 690 kPa (gage) 15 scfm
at 100 psig.
2.12.14.5
Bag Assemblies
Each filter bag assembly shall include the filtering media, wire retainer
and stainless steel clamping device. Filter bag shall slide over the
retainer and both shall be clamped to the venturi by a stainless steel
common band clamp. Top portion of the retainer shall have inside dimension
equal to the mating venturi to ensure a tight fit.
SECTION 15502N
Page 136
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