Platforms shall be designed to support a 488 kilogram per square meter 100
pound per square foot live load. Walking surfaces of walkways and
platforms shall be fabricated of ASTM A 242/A 242M raised pattern floor
plate minimum 5 mm 3/16 inch thickness. Platforms, walkways, stairways,
fixed ladders, handrails and kickplates shall be hot dipped galvanized
after fabrication in accordance with ASTM A 123. Minimum galvanized coating
weight per surface shall be not less than 0.70 kilogram per square meter
2.3 ounces per square foot.
2.2.9.2
Access Doors
Access doors to hoppers and mechanical or electrical components shall be
accessible from walkways or be provided with a permanent steel ladder or
stairway to facilitate maintenance. Provide internal and external
handholes at all access doors to facilitate entry. Provide access doors to
hoppers and to inlet plenums and to outlet plenums. Provide fixed
industrial stairs or fixed ladders that meet OSHA 29 CFR 1910-SUBPART Dto
connect access doors. Access doors shall be permanently hinged or be
completely removable by guide-action fastening devices. Key interlocks are
required only on hinged doors.
2.2.10
Insulation and Casing
Insulate and case the collector shell [including flue gas inlet manifold]
and hoppers. Insulation shall be asbestos free. Provide a walking surface
on all top surfaces hereinafter specified, where periodic equipment
maintenance or inspection of equipment located in that area is required.
2.2.10.1
Insulation Material
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NOTE:
1. For multitube collector(s) use minimum thickness
of 65 mm 2 1/2 inches for operating temperature
range of 94 to 260 degrees C 201 to 500 degrees F,
and minimum thickness of 140 mm 5 1/2 inches for
operating temperatures above 261 degrees C 501
degrees F.
2. For 300 mm 12 inch or larger diameter
centrifugal cyclone collector(s) use minimum
thickness of 140 mm 5 1/2 inches.
3. For ductwork with an operating temperatures 94
to 260 degrees C 201 to 250 degrees F, use minimum
insulation thickness of 65 mm 2 1/2 inches; for
operating temperatures 261 to 190 degrees C 251 to
375 degrees F, use minimum insulation thickness of
100 mm 4 inches; for operating temperature range 191
to 260 degrees C 376 to 500 degrees F, use minimum
insulation thickness of 125 mm 5 inches for
operating temperatures above 260 degrees C 500
degrees F, use minimum insulation thickness of 140 mm
5 1/2 inches.
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Externally insulate shell, hoppers, and ductwork. Mineral fiber block and
board insulation shall conform to ASTM C 612 and mineral fiber blanket
SECTION 15861N
Page 29
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