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Specification Value
Marley
/
NC Class Stainless Cooling Tower
/
Specifications: Base
5
2.0 Thermal Performance and Efficiency:
2.1 The tower shall be capable of cooling
_____ m
3
/h of water from ____ °C to
_____ °C at a design entering air wet-
bulb temperature of _____ C and its
thermal rating shall be Certified by the
Cooling Technology Institute.
2.2 The tower shall be capable of a mini-
mum _____ m
3
/h/kilowatt efficiency per
ASHRAE Standard 90.1.
2.3 CTI Certification notwithstanding,
the cooling tower manufacturer shall
guarantee that the tower supplied
will meet the specified performance
conditions when the tower is installed
according to plan. If, because of a
suspected thermal performance defi-
ciency, the owner chooses to conduct
an on-site thermal performance test
under the supervision of a qualified,
disinterested third party in accordance
with CTI or ASME standards during the
first year of operation; and if the tower
fails to perform within the limits of
test tolerance; then the cooling tower
manufacturer will pay for the cost of
the test and will make such corrections
as are appropriate and agreeable to the
owner to compensate for the perfor-
mance deficiency.
3.0 Warranty:
3.1 The entire tower, including struc-
ture, casing, basins, decking, fan(s),
motor(s), and all mechanical drive com-
ponents (including belts, if used) shall
be warranted against failure due to
defects in materials and workmanship
for a period of five (5) years from the
date of shipment to the job. Towers not
covered by a warranty of this scope
will not be accepted.
4.0 Design Loading:
4.1 The tower structure, anchorage and all
its components shall be designed by
licensed structural engineers per the
International Building Code to with-
stand a wind load of 1.44k/Pa, as well
as a .3g seismic load. The fan deck
and hot water basin covers shall be
■ CTI Certification means that the tower
has been tested under operating condi-
tions and found to perform as rated by
the manufacturer under those circum-
stances. It assures the buyer that the
tower is not intentionally or inadvertent-
ly undersized by the manufacturer.
■ The minimum efficiency per ASHRAE
Standard 90.1 for induced draft open cooling towers applied to comfort
cooling is 8.68 kW @ 35/29.5/24. There are no efficiency requirements for
non-comfort cooling applications. If you want greater efficiency you can
require it by specifying a higher ASHRAE Standard 90.1 m
3
/h/kilowatt.
■ CTI certification alone is not sufficient to assure you that the tower
will perform satisfactorily in your situation. Certification is established
under relatively controlled conditions, and towers seldom operate
under such ideal circumstances. They are affected by nearby structures,
machinery, enclosures, effluent from other towers, etc. Responsible and
knowledgeable bidders will take such site-specific effects into consider-
ation in selecting the tower—but the specifier must insist by the written
specification that the designer/manufacturer guarantee this “real world”
performance. Any reluctance on the part of the bidder should cause you
some concern.
■ It is important to understand the distinction between structure and
anchorage. Specifying that only the anchorage meet these require-
ments means the tower can become non-functional, even fall down, yet
remain attached to the foundation. Specifying structure will require the
tower to remain operational.
The indicated design values are the minimum allowables under accept-
ed design standards. They give you assurance that the tower can be
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