Framework, structural supports, and equipment supports shall be
[zinc-coated steel,] [Type 304 stainless steel,] [air-entrained concrete]
[FRP,] [or] [lumber]. Casing (exterior enclosing walls) shall be
constructed of [zinc-coated steel] [Type 304 stainless steel]
[air-entrained concrete] [FRP] [or] [lumber]. Framework design for wood
towers shall conform to requirements of CTI Std-103 for redwood
construction and CTI Std-114 for douglas fir construction. Notching
structural wood members may be permissible only if the members are
increased proportionately in size to provide equivalent strength.
Materials provided for framework, casings and equipment supports shall be
compatible. Structural supports shall be provided in accordance with the
recommendations of the manufacturer of the tower unless otherwise
indicated. [Cold-pour concrete joints in vertical walls shall have a
continuous water-stop stripping of molded polyvinyl plastic (150 mm 6 inch
dumbbell).]
2.5.3
Foundations
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NOTE: For the design of a tower foundation,
indicate the location, the size, the reinforcement
requirements, etc. necessary for a cooling tower
available from three commonly known manufacturers.
For small retrofit type jobs the designer may choose
to show the general layout of the foundation and
rely on the Contractor to design and construct the
foundation based on the cooling tower to be
provided. Delete the last two sentences of the
paragraph if the foundation is not to be designed by
the Contractor.
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Cooling tower foundations shall meet the requirements of the cooling tower
manufacturer and be as indicated. Foundation design shall be based on the
load conditions and soil bearing value indicated. Foundation calculations
shall be submitted with the equipment drawings.
2.5.4
Stairways and Ladders
Provide stairs, 60-degree ship ladders or straight-rung ladders of standard
design, starting at [ground] [roof] level and extending as high as required
to gain access to fan decks and water distribution systems. Stairways and
ladders shall be hot-dip, zinc-coated steel. Ladders higher than 3.66
meters 12 feet shall have a safety cage.
2.5.5
Handrailings
Steel handrailings shall be not less than 1067 mm 42 inches high around the
exterior of each working surface that is 3.66 m 12 feet or more above the
ground, roof, or other supporting construction. Railings shall be not
smaller than 32 mm 1-1/4 inch zinc-coated steel pipe with standard
zinc-coated steel railing.
2.5.6
Access Doors
Each tower shall be provided with access doors at grade level to provide
entry to the interior for service maintenance without removal of the fill.
Doors shall be provided on each endwall of each cooling tower cell. Frame
and brace access doors to prevent damage when opening and closing. Doors
SECTION 15645A
Page 12
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