and lace in place insulation using number 14 dead soft Type 302 stainless
steel wire, conforming to ASTM A 580/A 580M.
3.6.2
Block and Mineral Fiberboard Insulation Installation
Secure block and mineral fiberboard insulation in place with insulation
lugs spaces on not greater than 300 by 460 mm 12 by 18 inchcenters.
Provide stud type lugs welded in place. Reinforce blocks on the exterior
face with expanded metal if necessary to prevent sagging or cutting of the
insulation by the lacing wire. Securely wire block and mineral fiberboard
insulation of the specified thickness 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.
3.6.3
Mineral Fiber Blanket Insulation Installation
Secure mineral fiber blanket insulation in place with speed washers and
impaling pins spaced on centers not exceeding 300 mm 12 inches. Provide
mineral fiber blanket insulation with expanded metal reinforcement on the
outer surface and wire mesh or expanded metal on the inner surface.
Tightly butt sections of the blankets together and securely tie for maximum
sealing at joints. Secure the blanket at joints to prevent peeling or
bulging away from blanket edges. Do not reduce the design thickness of
insulation when applying speed washers.
3.6.4
Housing Hot Roof
Install calcium silicate insulation conforming to ASTM C 533 over 12 gage
steel pins stud welded on 610 mm two foot centers to the surface to be
insulated. Hold the insulation in place by 65 mm 2 1/2 inch square speed
washers and closely fit around penetrations. Construct top surfaces of
steel conforming to ASTM A 242/A 242M raised pattern plate not less than 6
mm 1/4 inch thick and suitably support to bear 488 kg per square meter 100
pounds per square foot live load. Seal joints by continuous fillet or
complete penetration groove welds as applicable. Weld appurtenances
similarly to the plate. Provide top penetrations with a 50 mm 2 inch
minimum extension above the plate and similarly weld to the plate.
3.7
PROTECTION FROM INSULATION MATERIALS
Protect equipment and structures from damage from insulation materials.
After completion of the work, clean, repair, and restore equipment and
structures to their original state. Repair any casing which becomes
corroded, discolored, or otherwise damaged by replacing of casing or other
means acceptable to the Contracting Officer.
3.8
CASING INSTALLATION
3.8.1
Structural Steel Grid System
Install casing over exterior insulated surfaces on an aluminized structural
steel grid system of subgirts designed, furnished, and installed by the
contractor. Provide subgirts of sufficient size, gage, and depth to
provide adequate support and a smooth exterior surface and weld to the
equipment and structural support surfaces. Provide subgirts of sufficient
depth to provide for application of the full thickness of insulation over
the stiffeners, access doors, flanges, ribs, and other surfaces having
uneven contours to provide a smooth finished surface. Provide subgirts on
SECTION 15862N
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