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Specifications
Specification Value
Marley
/
MCW Cooling Tower
/
Specifications: Base
23
4.0 Design Loading:
4.1 The tower and its components shall be
designed to withstand a wind load of
1.44 kPa as well as .3g seismic load.
The cooling tower shall be designed
to withstand shipping and hoisting
loads of 2g horizontal or 3g vertical.
Handrails, where specified shall be
capable of withstanding a 890 N con-
centrated live load in any direction and
shall be designed in accordance with
OSHA guidelines.
5.0 Construction:
5.1 Except where otherwise specified, all
components of the cooling tower shall
be fabricated of heavy-gauge steel,
protected against corrosion by Z600
galvanizing. After passivation of the
galvanizedsteel(8weeksatpH7-8,
and calcium hardness and alkalinity at
mg/Leach),thecoolingtowershallbe
capable of withstanding water having a
pH of 6.5 to 9.0; a chloride content up
to500mg/LasNaCl(300mg/LasCl-);
asulfatecontent(asSO
4
)upto200
mg/L;acalciumcontent(asCaCO3)
upto500mg/L;silica(asSiO
2
)upto
150 mg/L; and design operating ranges
up to 10°C The circulating water shall
contain no oil, grease, fatty acids, or
organic solvents.
5.2 The specifications, as written, are
intended to indicate those materials
that will be capable of withstanding the
above water quality in continuing ser-
vice, as well as the loads described in
paragraph 4.1. They are to be regarded
as minimum requirements. Where
component materials unique to indi-
vidual tower designs are not specified,
the manufacturers shall take the above
water quality and load carrying capabili-
ties into account in the selection of
their materials of manufacture.
6.0 Mechanical Equipment:
6.1 Fan(s)shallbeforwardcurvedcen-
trifugal-type, which are statically and
dynamically balanced. The fan impeller
is manufactured from galvanized steel,
blades are riveted to the center plate
and inlet rings and have stay rods to
ensure maximum concentricity and
rigidity. The stay rods are adjusted by
the manufacturer during the balancing
operation and require no field adjust-
■ The indicated design values are the minimum allowables under
accepted design standards. They give you assurance that the cool-
ing tower can be shipped, handled, hoisted—and ultimately operated
in a normal cooling tower environment. Most MCW Series models
will withstand significantly higher wind and seismic loads. If your
geographic location dictates higher wind load or seismic load values,
please make the appropriate changes, after discussion with your
Marley sales representative.
■ In the history of cooling towers, no other coating for carbon steel has
exhibited the success and longevity of galvanization in exposure to
the normal cooling tower water quality defined at left. No paints or
electrostatically-applied coatings, however exotic they may be, can
approach galvanization's history of success.
If extended longevity of the cooling tower is required—or unusually
harsh operating conditions are expected—consider specifying stain-
less steel as either the base construction material, or the material
utilized for specific components of your choice. See Stainless Steel
Options on page 16.
■ The Marley drive system features all-aluminum sheaves (pulleys),
power band belts, and long-life bearings for dependable service.
To reduce cost, some manufacturers may use TEAO motors, whose
only source of cooling is the flow of air produced by the cooling
tower fan. They are sometimes applied at kWs significantly beyond
their nameplate rating.
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