SPX Cooling Technologies Marley MC 7014H081 - 7014K121 - Manual (Page 17)

Specifications Specification Value
Marley / MC Fluid Cooler / Specifications: Base
17
the test and will make such corrections
as are appropriate and agreeable to the
owner to compensate for the perfor-
mance deficiency.
4.0 Coil:
4.1 Coil(s) shall consist of fully welded box
headers with serpentine coils and hot-dip
galvanized after fabrication. Coils shall
be tested to 2757 kPa air pressure while
immersed in water. Maximum operating
design pressure shall be 1551 kPa. The
coil shall be designed for free drainages
of fluid at shutdown.
5.0 Design Loading:
5.1 The fluid cooler and its components
shall be designed to withstand a wind
load of 1.44 kPa. The fluid cooler 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 concentrated live load in any direc-
tion and shall be designed in accor-
dance with OSHA guidelines.
6.0 Construction:
6.1 Except where otherwise specified, all
components of the fluid cooler shall
be fabricated of heavy-gauge steel,
protected against corrosion by G600
galvanizing. After passivation of the
galvanized steel (8 weeks at pH 7-8,
and calcium hardness and alkalinity at
100-300 mg/L each), the fluid cooler
shall be capable of withstanding water
having a pH of 6.5 to 9.0; a chloride
content up to 500 mg/L as NaCl (300
mg/L as Cl-); a sulfate content (as SO
4
)
up to 250 mg/L; a calcium content (as
CaCO3) up to 500 mg/L; silica (as SiO
2
)
up to 150 mg/L; and design operat-
ing ranges up to 10°C. The circulating
water shall contain no oil, grease, fatty
acids, or organic solvents.
6.2 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
regarded as minimum requirements.
Where component materials unique
to individual fluid cooler designs are
not specified, the manufacturers shall
■ The MC Fluid Cooler
coil is suitable for cool-
ing water, oils and other
fluids compatible with
carbon steel in a closed,
pressurized system. Each
coil is constructed of all-
prime surface, continu-
ous steel tubing, formed
into a serpentine shape
and welded into an assembly. The complete assembly is then hot-dip
galvanized after fabrication. Design pressure is 1551 kPa, and each coil
is tested to 2757 kPa air pressure under water. Tubes are sloped to pro-
vide free drainage when vented.
■ The indicated design values are the minimum allowables under
accepted design standards. They give you assurance that the fluid
cooler can be shipped, handled, hoisted—and ultimately operated in
a normal fluid cooler environment. Most MC Series models will with-
stand 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 fluid coolers, no other coating for carbon steel has
exhibited the success and longevity of galvanization in exposure to
the normal fluid cooler 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 fluid cooler 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 17.