SPX Cooling Technologies Marley Sigma Wood CoolingTower 1200 - Manual (Page 11)

11
Cold Water Collection Basins
If you plan to locate your tower above grade, a treated
Douglas fir Marley cold water collection basin is available,
complete with the necessary operating accessories. The
basin floor is exterior grade, pressure-treated fir plywood,
supported on joists. Basin sides are plywood, machined to
fit the basin floor, providing a water-tight joint after sealing.
The standard wood basin includes at least one
depressed, side-outlet sump. The number and size of
sumps depends on the circulating water rate and the overall
size of the tower. Unless otherwise specified, sumps include
plugged drains and hot-dip galvanized debris screens.
Standard sumps are FRP construction or hot-dip galvanized
steel, depending on outlet size.
Stainless steel sumps and screens are available as
options at extra cost.
Each basin includes an overflow/cleanout connection
consisting of a galvanized full coupling and standpipe. The
normally-installed standpipe ensures adequate freeboard in
the cold water basin and removes easily for flush-out basin
cleaning.
A float-operated, mechanical make-up valve provided
with each basin automatically replenishes water lost from
the system. The valve is located in the plenum chamber
between fill banks, just inside the endwall access door to
facilitate adjustment and maintenance.
/ Special Component Options /
High Design Loadings
Our engineers will make sure that your Sigma tower
will withstand any higher-than-normal design loadings
(wind, earthquake, decking, etc.) that you may specify.
Clearly define any special design requirements in your tower
specifications. We’ll make any necessary changes to the
tower’s structural design. This is equally true if you anticipate
incoming hot water temperatures above 120°F.
The specification should also describe the type of load
system served by the tower, and include the expected
water quality analysis, so that our engineers can select and
recommend appropriate changes in component materials
to assure satisfactory service. Discuss any questions about
technical requirements with your trained Marley sales
representative.