2.5
ATMOSPHERIC COOLING EQUIPMENT
[Cooling tower] [Evaporative water cooler] [Evaporative condenser] shall be
[induced] [or] [forced] mechanical draft, [vertical] [horizontal] discharge
[parallel-flow] [counter-flow] [or] [cross-flow] type of fire-resistant
construction. Cooling equipment shall be factory fabricated, assembled and
tested. [Cooling tower shall conform to requirements of FS F-C-2791,
except as modified hereinafter.]
2.5.1
Design and Performance Requirements
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NOTE: When 53 m/s 10,500 fpm velocity is exceeded,
noise may become a significant factor. Low tip
speeds may or may not increase size of cooling
tower. Consider probability of chemically-treated
high-dissolved-solids drift loss causing damage to
adjacent structures and environment (trees, shrubs,
etc.).
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The requirements of CTI ATC-105 shall be the basis of establishing unit
capacity and performance. Unit capacity shall include a site recirculation
factor. Performance wind velocity shall be 8 km 5 miles per hour. Drift
loss shall not exceed 0.1 percent of unit circulation rate. Minimum unit
design wind load shall be [146 kg per square meter] [30 pounds per square
foot] [_____]. [Minimum design fan deck live load shall be [195 kg per
square meter] [40 pounds per square foot] [_____].] Fan tip speed shall not
exceed [53 mps] [10,500 feet per minute][_____]. Design and construction
of steel members shall conform to AISC 335 and AISI SG-973.
2.5.2
Materials of Construction
Metallic materials of construction shall be mill galvanized or hot-dip
galvanized after fabrication. Plastics shall have an ASTM E 84 flame
spread rating of 25 or less, except as otherwise specified.
2.5.3
Framework and Casing
Structure shall withstand maximum stresses imposed. Panel joints shall
drain to interior. Seals, fasteners, and flashing shall be provided to
preclude external to unit water leakage. [Discharge cylinder height shall
be not less than [_____] mm inches above fan deck.]
2.5.4
Inlets and Louvers
Louver material shall be of thickness, configuration and support span to
prevent flutter or sagging under loads imposed during operation. Inlet
shall be fitted with square mesh galvanized hardware cloth with minimum 80
percent open area.
2.5.5
Distribution System
Hot-water distribution system shall be [open basin] [or] [pressurized spray
nozzle] type. [Open basin shall be designed to permit surge water flow 40
percent greater than specified flow without overflow of basin. Basin shall
be fitted with removable cover.] System shall be self-draining and
nonclogging. [Means to isolate and balance flow to each section of unit
shall be provided.]
SECTION 15602N
Page 16
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