withstand up to 172 kPa (gage) 25 psig. Enclose pressure switch elements,
120 VAC, dual-pole dual-throw relays, in a NEMA ICS 6enclosure.
2.8.5.4
Graphics
Provide a graphic subpanel to pictorially describe the flue gas flow path
through each baghouse, including through the ductwork, bypass, dampers,
fans, and valves, to display the operating status of each fan, and to
display the position of each valve and damper. Provide control switches,
indicating lights, and meters adjacent to the corresponding graphic
equipment symbol. Provide smooth finished display openings for the
switches, lights, and meters, in the panel metal behind acrylic sheeting.
The graphic symbols, flow lines, nameplates shall be:
a.
Base material: 6 mm 1/4 inch phenolic or 4.76 mm 3/16 inch solid
acrylic sheeting.
b.
Letters and symbol material:
Laminated phenolic or acrylic
sheeting.
c.
Equipment symbols, flow arrows, and nameplates thickness: one mm
0.040 inch.
d.
Flow line thickness:
0.50 mm 0.020 inch.
e.
Color:
Solid white core with colored satin finish overlay.
f.
Engraving: Engrave through colored overlay to expose solid core.
Cut laminate with beveled edges, except flow lines, to expose
solid core on perimeter.
g.
Mounting: Mount to front face sheet with contact cement. Cement
shall be removeable using a solvent that will not damage face
sheet or symbols. Do not use double-faced adhesive tapes.
Indicating lights shall be nominal 15 mm 1/2 inch diameter and rated for
120 VAC. Provide the following indicating lights; lens colors are in
parentheses, * indicates items activating an audible alarm:
a.
Inlet damper--OPEN (green)
b.
Inlet damper--CLOSED (red)
c.
Outlet poppet--OPEN (green)
d.
Outlet poppet--CLOSED (red)
e.
Module--ACTIVE (green)
f.
Module--INACTIVE (red)
g.
Hopper throat heater--ON (green)
h.
Hopper throat heater--OFF (red)
i.
High ash level (red)*, one per hopper
j.
High inlet gas temperature (red)*
SECTION 15863N
Page 36
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