baghouse, hopper heaters, fly ash level detectors, induced draft fans,
pumps, dampers, control valves, air pollution monitors, FGD system
panelboard, and analog control systems. Field service engineers shall
perform an inspection prior to startup to verify that the unit is installed
in conformance with the manufacturer's recommendations. A written report
of the inspection, performed by the field service engineer, shall be
submitted to the Contracting Officer stating his findings including the
acceptability of the FGD system for field performance tests within 15
calendar days after his inspection. Field service engineer shall be on
call for 30 days after start-up.
3.2
INSULATION INSTALLATION
3.2.1
General
Insulation shall be applied with interruptions to permit access doors,
inspection doors, flanges, and other special features to be opened or
removed for inspection or maintenance without disturbing the insulation.
Boxouts around code stamping symbols and nameplates shall be provided.
Double thickness insulation shall be installed with the joints of the two
layers staggered. Cracks, voids, and depressions in layers of insulation
shall be filled with suitable insulating cements before application of
another layer of insulation as required to allow for thermal expansion
movements which might cause cracks or tears in the insulation. Insulation
shall be installed between stiffeners or over stiffeners in such a manner
that stiffeners are completely insulated. Additional insulation or casing
spacers shall be installed between stiffeners so that a uniform level
surface is achieved. The intent of this insulating procedure is to prevent
a direct metal path between inside the dry FGD system and ambient air.
Insulation shall be securely wired and laced in place using No. 14 dead
soft type 302 stainless steel wire, conforming to ASTM A 580/A 580M.
3.2.2
Block and Mineral Fiberboard Insulation Installation
Block and mineral fiberboard insulation shall be held in place with
insulation lugs spaced on not greater than 300 by 450 mm 12 by 18 inch
center. The lugs shall be stud type welded in place. Blocks shall be
reinforced on the exterior face with expanded metal, if necessary, to
prevent sagging or cutting of the insulation by the lacing wire. Block and
mineral fiberboard insulation of the specified thickness shall be securely
wired in place over the entire surface by means of wire threaded through
the lugs both ways, pulled tight with the ends of the wire loops twisted
together with pliers, bent over, and carefully pressed into the surface of
the insulation.
3.2.3
Mineral Fiber Blanket Insulation Installation
Mineral fiber blanket insulation shall be held in place with speed washers
and impaling pins spaced on centers not exceeding 300 mm 12 inches.
Mineral fiber blanket insulation shall be provided with expanded metal
reinforcement on the outer surface and wire mesh or expanded metal on the
inner surface. Sections of the blankets shall be tightly butted and jammed
together, and securely tied for maximum sealing at joints. The blanket
shall be secured at joints to prevent peeling or bulging away from blanket
edges. Care shall be taken in applying speed washers so that the designed
thickness of insulation is not reduced when washers are installed.
SECTION 15864N
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