and executive storage. Logic functions shall be performed by software
engineer. Logic shall be documented by flow charts or word logic, and by
program listings. Memory shall be static. Programming aids shall be
provided to permit easy field reprogramming. Battery power back-up may be
approved by the Contracting Officer. System electronics shall be buffered
and protected from external power sources by optical couplers or reed
relays. Software shall be factory tested and debugged including simulating
inputs and outputs and checking resulting logic sequences.
2.12.4
Flue Gas Cleaning System Panelboard and System Cabinets
Provide one common vertical panelboard and system cabinet sections, as
specified, to control the flue gas cleaning equipment for boilers.
Panelboard dimensions shall be 0.762 m deep by 2.44 m wide by 2.44 m high
30 inches deep by 96 inches wide by 96 inches high. No process fluids or
pneumatic signal lines shall be brought into any panelboard or system
cabinet.
2.12.4.1
Construction
Construct of 3 mm 1/8 inch hot-rolled steel panels reinforced with angles
and channels in the interior to form a single, rigid, freestanding unit in
compliance with NEMA 12. Panelboards shall be completely enclosed
floor-mounted units, except with bottom open. Panelboards shall be
constructed with no bolt heads or fastenings visible from the exterior.
Construct with 6 mm 1/4 inch radius corners. Edges shall be filled and
ground to conform to a 6 mm 1/4 inch radius. Provide interior innerpanels
for mounting auxiliary equipment and terminal blocks, as required. Make
provisions for anchoring to floor or foundation. Provide hinged doors on
the rear of the panelboard with key locks to allow access to equipment.
Provide lifting eyes and shipping pallet on the panelboard to facilitate
moving into the steam plant. Provide ventilation grills, exhaust fans,
ductwork, and filters, as required. Provide cutouts and removable cover
plates for items designated as future. Paint cover plates to match panels.
Prime and paint panelboard as specified. System cabinets shall conform to
the following requirements: Steel frame and sides, freestanding, and fully
enclosed. Front and rear access doors with key locks to allow access to
racks. Cabinets shall be maintained at positive pressure using a fan
powered by a 120-volt, single-phase motor with a minimum power output of
0.09 kW 1/8 hp. Maintain cabinet pressure at least at 125 Pa 0.5 inch water
gage. Provide ventilation louvers as required. Size ventilation system
to ensure adequate heat dissipation and to maintain continuous operation
without loss of function or cause reduced life. Pressurizing air shall be
filtered with a 98.5 percent minimum efficiency for dust particles one
micron or larger. Control cabinet shall be equipped with a safety key
interlock (and shall be located as indicated). Assemble cabinets in
sections in sizes convenient for handling and moving into the steam plant,
but with lifting eyes and shipping pallet for each separate section.
Design cabinets to allow sections to be installed side-by-side. Provide
side openings at the bottom of the sections as required to permit
interconnection of the sections by prefabricated cables without routing the
cables outside of the cabinets. Provide work light and one 120 VAC, duplex,
3-wire-polarized-grounding type, specification grade, convenience outlet in
each cabinet.
2.12.4.2
Finish
Smooth, fill, and apply one coat of primer and two coats of finish paint to
exterior surfaces. Apply one coat of primer and one coat of white paint to
SECTION 15864N
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