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Specifications
Specification Value
Marley
/
Sigma Steel Cooling Tower
/
Specifications: Base
18
7.0 Hot Water Distribution System:
7.1 The mechanical equipment support/
crossover pipe shall deliver water to
two open hot water basins per cell
at the fan deck elevation. Water shall
exit these basins to the fill by gravity
through metering orifice-type polypro-
pylene nozzles situated in the basin
floor. Nozzles shall be easily removable
and replaceable.
7.2 Heavy-duty, industrial grade flow-
control valves shall be provided at
the inlet to each basin. These valves
shall permit both flow balancing and
maintenance shut-off to selected cells,
or portions of cells. Valves shall have
machined cast iron bodies, with stain-
less steel operating stems, and heavy-
duty locking handles.
8.0 Casing:
8.1 Tower endwalls shall be cased with
corrugatedFRPpanels,attachedwith
corrugations running vertically and
overlapped one corrugation at joints.
Tower corners shall be finished with
FRPcornerrollsovertheendsofthe
casing sheets.
8.2 In the water-washed fill areas, inner
casings of 16 gauge galvanized steel
shall also be provided.
9.0 Access:
9.1 There shall be a 33" wide by 61" high
access door in each endwall casing to
provide access to the interior of the
tower. Access doors shall be hinged
and equipped with a latch operable
from both inside and outside the
tower. Internal partitions between cells
shall include hinged doors to give free
access through the tower.
■ Gravity-flow distribution basins are a feature
of crossflow type towers. These basins are
out where they can be easily inspected—even
maintained—while the tower is in operation.
Spray systems of counterflow towers, sand-
wiched between the top of the fill and the drift
eliminators, are extremely awkward to access
and maintain.
■ Marley flow-control valves remain serviceable for the life of the tower,
and provide a continuing means of flow-regulation between hot water
basins—and between cells of multicell towers as well. Towers without
valves do not provide this valuable operating flexibility.
■ Steel inner casings provide lateral sup-
port for the fill that FRP panels cannot.
They also support the FRP casing pan-
els against the high wind loads that
will act on the tower during its lifetime.
■
The access doors on other towers may be unreasonably small.
Specifying the size of the door will cause those bidders to take excep-
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