input filters for noise suppression.
Provide a full-capacity internal DC
power supply for each bus.
2.8.4
Control Drive
Provide adjustable speed pneumatic control drives including handwheels,
couplings, adapters, linkage system, drive arms, and damper arms, to
respond to signals from the control system. Provide dual-pole dual-throw
limit switches to electronically sense open and closed damper positions
without using a slide mechanism. The full-stroke travel time of the damper
drive piston in either direction shall be adjustable from one second to one
minute.
2.8.5
Main Baghouse Control Panel
Provide an enclosed control panel cabinet for each baghouse. Baghouse
controls and indicators shall include meters, recorders, thermocouples,
pressure gages, graphics, annunciators, power supplies, power switches, and
wiring. The cabinets, 3 mm 1/8 inch hot-rolled steel paneled NEMA ICS 6,
Type 12 enclosures, reinforced inside with angles and channels, shall have
lifting lugs for shipping and handling. Provide a shipping pallet for each
control panel cabinet. Cabinets shall also include one two-tube 40 W, 120
V fluorescent light fixture, one 120 VAC duplex 3 wire polarized grounded
outlet, terminal blocks, interior panels for mounting auxiliary equipment,
front and rear hinged access doors with key locks, cutouts with removeable
cover plates for items designated as future, and floor anchoring or a floor
foundation. Install cabinet sections side by side and provide bottom side
openings to interconnect the cables without routing the cables outside of
the cabinets. Do not bring power greater than 120 V into the cabinet.
Fill and grind cabinet edges to a 6 mm 1/4 inch radius. Maintain cabinets
at minimum 125 Pa 0.5 inch WC using a fan powered by a 120 V, single-phase
minimum 0.09 kW 1/8 hp motor. Provide a ventilation system including
ventilation louvers, grills, exhaust fans, ductwork, and filters to ensure
heat is dissipated. Filter pressurizing air for particulates greater than
one micron at a minimum 98.5 percent efficiency.
2.8.5.1
Recorders
Provide each miniature pen strip chart recorder with an engraved scaled
legend plate, a rubber legend stamp, internal fluorescent lighting, a set
of tools and accessories, and a 12 month supply of charts and ink. Design
recorders for 120 VAC power. Miniature pen strip chart recorders shall be
100 mm 4 inches in width having a 25 mm one inch per hour chart speed.
2.8.5.2
Thermocouples
Provide Type K ungrounded thermocouples with AWG Size 20 iron-constantan
wires for measuring ductwork, and surface temperatures. Provide universal
thermocouple heads with screwed covers, chains, terminal connectors, and
stainless steel nipples so that head clears insulation by 50 mm 2 inches.
Ductwork thermocouples shall be spring loaded with two hole insulators,
Type 304 stainless steel sleeve sheath, and silver plug tip. Insulate
surface thermocouples using a glass fiber insulating jacket to protect
thermocouples from high temperatures.
2.8.5.3
Pressure Gages
Provide pressure gages indicating pressures from zero to 2490 Pa 10 inches
WC, with high and low pressure rip set points. Pressure gages shall
SECTION 15863N
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