steel. Each bolt shall be provided with neoprene and cadmium-plated steel
washers under the heads. Nails shall be silicon bronze, commercial bronze,
or stainless steel. Hardware shall meet the salt-spray fog test as defined
by ASTM B 117.
2.5
COOLING TOWER
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NOTE: The only type of cooling tower defined in
this specification is the induced mechanical draft
type. Neither the atmospheric type or the forced
mechanical draft type will be used for Army
construction projects.
This specification covers 2 types of cooling tower
construction; 1) packaged (factory fabricated,
factory/field-assembled), 2) field-erected. The
structural components of a packaged type tower is
typically metal, wood, or FRP materials (or a
combination of each). The structural components of
a field-erected type tower is either wood or
concrete. Field-erected towers are typically
selected for their longevity over the packaged type,
but are considerably more expensive and should only
be used if documented to be economically cost
effective. Delete all references to either packaged
or field-erected towers if not applicable.
The crossflow cooling tower design will be the
design of choice. Counterflow designs are typically
only used on large field-erected cooling towers.
When project requirements limit the use of wood
construction in cooling towers, all references to
wood construction will be removed.
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2.5.1
Type
Tower shall be the induced mechanical draft type of the [crossflow]
[counterflow] design and shall be certified by the Cooling Tower Institue
(CTI). Factory fabricated, factory-assembled towers which are shipped to
the job site in separate cells or modules shall be provided with all
appropriate manufacturer's hardware for assembly in the field. Factory
fabricated, field-assembled towers shall be assembled and adjusted at the
job site by a factory representative.
2.5.2
Framework, Casing, and Supports
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NOTE: Packaged type cooling towers are typically
constructed to withstand a 1.4 kPa (30 psf) windload.
**************************************************************************
Towers shall be designed and constructed to withstand a wind pressure of
not less than [1.4] [_____] kPa [30] [_____] pound-force per square foot
(psf) on external surfaces. [A 15 percent increased loading shall be
included for ice or snow load.] [Air inlet and discharge terminations
shall have flanged or lipped projections for connecting ductwork.]
SECTION 15645A
Page 11
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