SPX Cooling Technologies SS-NC-08A - Manual (Page 6)

Specifications Specification Value
Marley / NC Class Stainless Cooling Tower / Specifications: Base
6
designed for 2.4kPa live load or a 91kg
concentrated load. Guardrails, where
specified, shall be capable of with-
standing a 890N concentrated 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, series
300 stainless steel. The tower shall be
capable of withstanding water having a
chloride content (NaCl) up to 750 mg/L;
a sulfate content (SO4) up to 1200
mg/L; a calcium content (CaCO3) up to
800 ppm; silica (SiO2) up to 150 mg/L;
and design hot water temperatures
up to 52°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
service, as well as the loads described
in paragraph 4.1. They are to be regard-
ed as minimum requirements. Where
component materials peculiar 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.
shipped, handled, hoisted—and ultimately operated in a normal cooling
tower environment. Most NC Class 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.
Note: Some countries and states (Florida) require structure not anchor-
age. Check with you local officials.
1.44k/Pa windload, .3g seismic load—applicable for most applications
but consult the local code official for actual requirements.
2.4kPa live load, 890N concentrated load—ensures the tower can be
safely accessed for routine maintenance when a guardrail is installed as
well ensuring the end user complies with government safety laws.
■ For pure resistance to corrosion—coupled with the capability to meet
stringent fire and building codes—there is no substitute for stainless
steel! No paints or electrostatically-applied coatings, however exotic
they may be, can match stainless steel's ability to withstand adverse
operating conditions.
Although SPX Cooling Technologies makes use of many structural FRP
components in various other product lines, they are held to a relative
minimum in the NC Class Stainless line. This is to assure that there will
be no question as to the structural integrity, fire resistance, and life
expectancy in the mind of the owner.
Except for those unusual operating situations where the circulating
water may be so laden with suspended solids, algae, fatty acids, prod-
uct fibers, active organisms reflected in BOD, and the like that plug-
ging of film type fill is a probability, the NC Class Stainless is relatively
immune to poor water quality. Where such conditions do exist, how-
ever, thought should be given to the prevention of such carryover—or
to the use of a Marley splash-fill product. Please discuss your situation
with your Marley sales representative.
Factory Assembly