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Marley
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Sigma F Series Cooling Tower
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Specifications: Options
20
Specification Value
Cold Water Basin Options
Stainless Steel Cold Water Basin:
10.1 Replace paragraph 10.1 with the
following: Include a cold water col-
lection basin constructed of 12 gauge
series 304 stainless steel, through-
bolted and sealed to prevent leakage.
A depressed, side outlet sump of
series 304 stainless steel having a
1
⁄4"
(6.4 mm) thick faceplate drilled for a
standard class 125# ASME flange con-
nection will be included. A removable
stainless steel
1
⁄2" mesh debris screen
shall cover the top of the sump. An
appropriately sized (4" diameter or larg-
er) stainless steel standpipe overflow
shall be provided. The standpipe shall
be removable for flush-out cleaning of
the basin. A float-operated, mechanical
makeup valve shall also be included,
installed adjacent to the endwall
access door.
Watertight Partition between Tower
Cells with Stainless Steel Cold
Water Basin Option:
10.2 Replace paragraph 10.2 with the
following: Stainless steel watertight
partitions shall be provided between
cells in the cold water basin. They shall
be sealed watertight to the partitions
in the fill and plenum areas of the
tower. Cold water basin partitions shall
have weir openings allowing free flow
of water between cells. Weirs shall be
equipped with bolt-on, gasketed cover
plates to prevent water passage when
required.
Basin Heater:
10.3 Add the following paragraph in the
Cold Water Basin section: Add the
following paragraph in the Cold Water
Basin section: Provide a system of
electric immersion heaters and con-
trols to prevent freezing of water in
the collection basin during periods of
shutdown. The system shall consist
of one or more stainless steel electric
immersion heaters. A NEMA 4 enclo-
sure shall house a magnetic contactor
to energize heaters; a transformer to
provide 24 volt control circuit power;
■ Marley basins are used to permit the installation of towers on
elevated platforms or foundations.
This is the simplest of several cold water basin designs available
for the Sigma F Series towers. If preferred, a 10 gauge welded
stainless steel basin can be installed.
■ In addition to the normal partition function of preventing air
bypass (page 14), this option allows you to use each partitioned
cell of your tower independently. This is valuable where a single
multicell tower is serving several separate systems—or where
winter operation may require less than full tower capability.
■ The basin heater components described at left represent is rec-
ommended for a reliable automatic system for the prevention of
basin freezing.
The ambient air temperature that you fill in should be the lowest
1% level of winter temperature prevalent at site.