3.3.2
Access Openings
Access doors and other penetrations through the insulation shall have
insulation fitted closely to the hinges and fasteners and shall be neatly
framed and flashed to be weather tight and create a pleasing appearance.
Provide hinged or lift off doors designed for convenient opening at
nameplates, code stampings, non-projecting connections, and access
openings. Flash and weatherproof openings. Pitch all horizontal access
openings for water runoff. Provide all vertical access doors with flashing
above door head and flash to prevent wind driven rain from seeping under
the aluminum casing.
3.3.3
Weatherproofing
Install casings with proper overlap to make the installation weather tight.
Carefully fabricate and fit casing to ensure a neat appearance; furnish
required closures, flashings, and seals. Provide open ends of fluted
sections with tight-fitting closure pieces. Form and install flashing so
that water cannot enter and wet the insulation, and design and install
flashing to readily drain any water that might enter. Weatherproof joints
or openings in casing, which cannot be effectively sealed from entry of
moisture by flashings or laps by application of an aluminum pigmented
sealer manufactured for this type of service.
3.3.4
Convection Stops
Furnish and install convection stops on vertical surfaces over 3.66 meters
12 feet tall; maximum interval between convection stops shall be 3.66 meters
12 feet. Convection stops shall consist of steel channel of Z-girt,
covered with 80 mm 3 inch thickness of insulation.
3.3.5
Casing Attachment
**************************************************************************
NOTE: If a separate insulation section is part of
this specification, add note to that section to
indicate that insulation of the collector is covered
by this section.
**************************************************************************
Attach aluminum casing to structural steel grid system by means of No. 14
stainless steel, Series 300, self-tapping screws on 300 mm 12 inchcenters.
Fasten vertical laps and flashings by means of 20 mm 3/4 inch No. 14
stainless steel, Series 300, sheet-metal screws on 300 mm 12 inch centers.
Exposed screws shall have aluminum or stainless-steel backed neoprene
washers preassembled to screws. Install insulation so that it is not
compressed below nominal thickness.
3.4
HOPPER HEATER SYSTEM
Deliver system components to the job site in containers designed to protect
the components from adverse handling, weather, and storage conditions.
Store components in their original shipping containers, unless the
containers are damaged, or under protective weatherproof covering until
installation. Clean hopper surfaces of dust, grease, oil and rust
thoroughly prior to installation of any heater. Heater modules shall be
installed to provide maximum contact between the heaters and the hopper
wall. Furnish heaters with mounting hardware, channels, and brackets.
Throat heaters shall not overlap and shall be held in place with high
SECTION 15861N
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