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Specification Value
Marley
/
Sigma F Series Cooling Tower
/
Specifications: Base
14
3.0 Construction:
3.1 The tower shall be capable of with-
standing water having a pH of 6.5 to
8.0; a chloride content (NaCl) up to 750
ppm; a sulfate content (SO
4
) up to
1200 ppm; a calcium content (CaCO
3
)
up to 800 ppm; silica (SiO
2
) up to 150
ppm; and design hot water tempera-
tures up to 120°F (48.9°C). The circulat-
ing water will contain no oil, grease,
fatty acids, or organic solvents.
3.2 The structural framework of the tower
shall be pultruded or molded fiberglass,
designed in accordance with ASCE
Structural Plastics Design Manual. All
allowable design values shall be factored
for wet service, temperature, and duration
in accordance with standard engineering
practices.
3.3 Basic design criteria shall be 30 psf
(1.44 kPa) wind load and 5%g seismic
load.
3.4 Multicell towers shall include stainless
steel partitions between cells in the fill
areas, and fiberglass partitions in the
plenum area. Partitions shall extend
the full height of the tower from the
base of fill to the underneath side of
the fan deck.
3.5 Column lines shall be on no greater
than 4'-0" (1.22 m) longitudinal centers,
and the base of all columns shall be
firmly anchored to series 304 stainless
steel base plates. Framing joints shall
be made with 1/2" diameter or larger
series 300 stainless steel machine
bolts. Critical framing joints shall be
augmented with 1.06" OD heavy wall
fiberglass sleeves to transmit loads.
3.6 No field gluing of joints, or any other
structural member, will be allowed.
■ The limiting water quality values indicated are those which are
acceptable for the normal materials of construction specified. If
water of more aggressive quality is anticipated please change
hardware material requirement to series 316 stainless steel, or
silicon bronze, as you may have agreed upon beforehand with
the Marley sales representative.
If there is any doubt in your mind as to the grade of hardware
that is appropriate to your water quality, please have a sample of
it analyzed and provide Marley with a copy of the analysis.
Discuss higher design loadings with your Marley sales represen-
tative.
Multicell towers must have plenum partitions between cells.
Otherwise, air will be induced downward through an inoperative
fan, bypassing the fill entirely. Without these partitions, part-load
or off-season operation of the tower would be completely unsat-
isfactory.
Fill partitions prevent the random migration of water from cell to
cell, and permit individual cell operation during reduced ambient
or low load conditions.
The variable weather conditions encountered during on-site
construction of cooling towers does not result in the stable condi-
tions of temperature and humidity that assure proper bonding
during the gluing process.