be corrosion resistant and shall prevent warping, sagging, misalignment, or
vibration of the fill material. Fill material and supports shall be
designed to provide for an even mixing of air and water. Fill material
shall be constructed of [aluminum] [stainless steel] [tile of multi-cell
design, set without mortar] [PVC formed sheets, zinc-coated steel, or
lumber] in a pattern, and of sufficient height to meet the performance
specifications. [Tile fill shall be vitreous, with a low water absorption
that will pass a freeze-thaw test conducted in accordance with ASTM C 67.
Tile fill shall have a minimum crushing strength of 13.8 MPa 2,000 psi over
the gross area of the tile when the load is applied parallel to the cells
as tested in accordance with ASTM C 67. Cast iron tee section lintels
supporting the tile fill shall conform to ASTM A 48/A 48M, Class 25, 3.2 mm
1/8 inch additional thickness for corrosion. Lintels shall be designed
with a safety factor of 2 minimum.]
2.5.17
Fire Safety
**************************************************************************
NOTE: Locate the tower in accordance with NFPA 214,
and determine the extent and type of fire protection
required for all size towers using the factors
indicated in NFPA 214.
**************************************************************************
Towers shall conform to NFPA 214. Fire hazard rating for plastic
impregnated materials shall not exceed 25. Plastics shall not drip or run
during combustion. Fire hazard ratings shall be in accordance with ASTM E
84 or NFPA 255.
2.5.18
Noise Control
**************************************************************************
NOTE: Where cooling towers are in the proximity of
residential, administrative, medical, or similar
inhabited facility, the maximum acceptable noise
limits for such applications should be determined in
NC level or dBA, and coordinated with local code
requirements and the cooling tower manufacturer.
Indicate maximum NC levels on the drawings.
**************************************************************************
Sound power level data for the cooling tower shall be based on tests
conducted in accordance with ANSI S1.13. Maximum acceptable noise limits
for a cooling tower cell shall [be as indicated on the drawings.] [not
exceed the maximum permitted decibel levels for the designated octave band
as set forth in the following tables. Sound power levels in decibels shall
be based on a reference pressure of 0.0002 microbar.
Octave Band
(in Hz)
63
125
250
500
1000
2000
4000
8000
Sound Power
Level in dB [_____] [_____] [_____] [_____] [_____] [_____] [_____][_____]]
2.6
FABRICATION
**************************************************************************
NOTE: For equipment to be installed outdoors,
adequate protection will be specified.
SECTION 15645A
Page 17
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