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Base: Furnish and install an induced-draft, crossflow, factory-
assembled, steel cooling tower of ____ cell(s), as shown
on plans. Tower shall be similar and equal in all respects
to Marley Series 4900 Aquatower, Model _______. Tower
must be warranted by the manufacturer for one year from
date of shipment.
Performance: Tower shall cool ____ GPM of water from ____ °F
to ____ °F at a design entering air wet-bulb temperature of
____ °F and its thermal rating shall be certified by the Cooling
Technology Institute.
Construction: Structural components of the tower, including
the cold water basin, framework, mechanical equipment
supports, casing, hot water basin, and fan cylinder shall
be fabricated of heavy-gauge steel, protected against
corrosion by G-235 galvanizing per ASTM A-653. All
components subjected to factory welding shall be hot
dip galvanized after fabrication per ASTM A-123. Cold
galvanizing is not acceptable.
Motor: Motor(s) shall be ____ hp, Totally Enclosed, specially
insulated for cooling tower duty. Speed and electrical
characteristics shall be 1800 (or 1800/900) RPM, single-
winding, ____ phase, ____ hertz, ____ volts. The motor must
be located out of the saturated discharge air stream.
Mechanical Equipment: Fan(s) shall be adjustable-pitch
propeller type. Fan shall be driven through V-belt(s) with a
minimum service factor of 1.5 based on full motor hp and
protected with a belt guard. The fan and fan pulley shall be
supported by oil lubricated tapered roller bearings in a cast
iron housing with externally accessible remote oil reservoir
for easy maintenance.
Fill, Louvers and Drift Eliminator: Fill shall be film-type,
thermoformed PVC, with louvers and drift eliminator formed
as part of each fill sheet. Fill shall be suspended from hot
dip galvanized structural tubing supported from the upper
tower structure, and shall be elevated above the floor of
the cold water basin to facilitate cleaning. Air inlet faces of
the tower shall be free of water splash-out. Guaranteed drift
losses shall not exceed 0.005% of the design GPM.
Hot Water Distribution System: An open basin above the fill bank
shall receive hot water piped to each cell of the tower. The
basins shall be equipped with removable covers to keep out
debris. This basin shall be installed and sealed at the factory.
Water shall enter the basin through a removable wave-
suppressor splash box. The basin shall be no less than
6
3
⁄8" deep to provide adequate freeboard against overflow
and splash-out. Removable and replaceable polypropylene
nozzles installed in the floor of the basin shall provide full
coverage of the fill by gravity flow. Nozzles must all have
the same orifice size and be spaced symmetrically in both
longitudinal and transverse directions.
Cold Water Basin and Accessories: The cold water basin shall
be factory sealed. For maximum installation flexibility, basin
accessories shall include both a side suction connection
and a hole and bolt circle in the basin floor suitable for gravity
flow. Both connections shall include a debris screen and
anti-cavitation device. A factory-installed, float-operated,
mechanical makeup valve shall be included, having a
3
⁄4"
diameter inlet connection.
/ Specifications /