2.4
COOLING TOWER MATERIALS
2.4.1
Lumber
2.4.1.1
Douglas Fir
CTI Std-114, WWPA G-5, Grade B and better, Industrial Clear. Douglas fir
shall have a preservative treatment in accordance with CTI Std-112.
2.4.1.2
Plywood
CTI Std-134, Exterior Grade, type and thickness as specified for the
application.
2.4.1.3
Pressure Treated Lumber
Pressure treated lumber shall be in accordance with CTI Std-112. Wood
exposed as the result of notching, cutting, or drilling shall be saturated
with the preservative.
2.4.1.4
Redwood
CTI Std-103, RIS Grade Use California Redwood, clear of all hearts.
2.4.2
Fiberglass Reinforced Plastic (FRP)
FRP components shall be inert, corrosion resistant, and fire-retardant with
a thickness of 3.66 kg/square meter 12 ounces per square foot. FRP
components shall contain an ultraviolet (UV) ray inhibitor as per CTI
Std-137, Grade 1 or 3.
2.4.3
Zinc-Coated Steel
Components fabricated of zinc-coated steel shall be not lighter than 16
gauge steel, protected against corrosion by a zinc coating. The zinc
coating shall conform to ASTM A 153/A 153M and ASTM A 123/A 123M, as
applicable and have an extra heavy coating of not less than 0.76 kg/square
meter 2-1/2 ounces per square foot of surface. Galvanized surfaces damaged
due to welding shall be coated with zinc rich coating conforming to ASTM D
520, Type 1.
2.4.4
Polyvinyl Chloride (PVC) Formed Sheets
ASTM D 1784, Type I, Grade 1 with a flame spread rating of 25 or less per
ASTM E 84.
2.4.5
Stainless Steel Sheets
Type 304.
2.4.6
Concrete
Concrete shall conform to Section 03300A CAST-IN-PLACE STRUCTURAL CONCRETE.
Exposed concrete shall be rub-finished for smooth and uniform surfaces
free of form marks and defects. Honeycomb concrete shall not be permitted.
2.4.7
Hardware
Bolts shall be cadmium-plated, zinc-coated steel, or Type 304 stainless
SECTION 15645A
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