2.7.5.13
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 1/2
meters 12 feet shall have a safety cage.
2.7.5.14
Handrailings
Steel handrailings shall be not less than 1067 mm 42 inches high around the
exterior of each working surface that is 3 1/2 meters 12 feet or more above
the ground, roof, or other supporting construction. Railings shall be not
smaller than 32 mm 1.25 inch zinc-coated steel pipe with standard
zinc-coated steel railing.
2.7.5.15
Access Doors
Provide casings and fan decks with access doors to reach interior tower
parts without removal of fill. Provide access doors in each endwall of
each cooling tower cell. Frame and brace access doors to prevent damage
when opening and closing. Locate doors adjacent to float controls.
2.7.5.16
Louvers
Provide air inlet openings in casings with individually removable louvers
arranged to prevent escape of water. Fabricate from wood or
fiberglass-reinforced plastic. When different materials are provided for
casings and louvers, they shall be compatible; and one material shall not
produce stains upon the other.
2.7.5.17
Fill
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NOTE: Fire Safety: Design cooling towers having
wood fill with heat responsive devices and remote
controls to flood entire normal water distribution
system in case of fire in dry cells of cooling
towers. Indicate heat responsive devices under fan
decks, distribution basins, or in other locations
where necessary for activation. Where heat
responsive devices are inaccessible, provide
controls to test the system. Operation of heat
responsive devices shall activate building fire
alarm system, stop cooling tower fans, and provide
both audible and visual signals on the air
conditioning central control panel. Remote controls
to flood normal water distribution system shall be
quick action type. The design shall conform to the
requirements of NFPA 214 "Water-Cooling Towers."
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Polyvinyl chloride (PVC) formed sheets or designed as individual fill
batts, or zinc-coated steel [, or treated Douglas-fir; treated hemlock; or
treated redwood]. Zinc-coated steel shall have a minimum of 0.76 kg of
zinc per square meter 2.5 ounces of zinc per square foot of surface. PVC
fill shall not be provided when inlet temperatures exceed 52 degrees C 125
degrees F. No plasticized wood cellulose shall be provided for fill
material. Fill shall be removable or otherwise made accessible for
SECTION 15601N
Page 34
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