Specifications
Specification Value
MH Fluid Cooler —
Specifications: Base
11
6.0 Construction:
6.1 Except where otherwise specified, all
components of the fluid cooler shall be
fabricated of heavy-gauge steel, pro-
tected against corrosion by G-235 galva-
nizing. After passivation of the galvanized
steel (8 weeks at pH 7-8, and calcium
hardness and alkalinity at 100-300 ppm
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 ppm as
NaCl (300 ppm as Cl-); a sulfate content
(as SO
4
) up to 250 ppm; a calcium con-
tent (as CaCO
3
) up to 500 ppm; silica
(as SiO
2
) up to 150 ppm. 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 6.1. They are
to be regarded as minimum requirements.
Where component materials unique to
individual fluid cooler designs are not
specified, the manufacturers shall take
the above water quality and load carrying
capabilities into account in the selection of
their materials of manufacture.
7. 0 Mechanical Equipment:
7. 1 MHF7103, 7105, 7107 - Fan(s) shall
be driven through a one-piece multi-
groove, solid back V-type belt. Bearings
and fan shaft shall be contained in a cast
steel housing to insure proper fan shaft
alignment, pillow block bearings are not
allowed. Bearings shall be rated at an
L
10A
service life of 40,000 hours or
greater
7. 1 MHF705 – Fan(s) shall be heavy duty,
high efficiency, low sound axial flow
design. Fan(s) shall be driven through an
industrial grade system of V-belts, pul-
leys, and tapered roller or deep groove
ball bearings. Bearings shall be rated at
an L
10A
service life of 40,000 hours or
greater.
7.1 MHF706 and MHF707 – Fan(s) shall
be heavy duty, high efficiency, low sound
axial design, incorporating aluminum alloy
■ 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 stainless steel as either the base
construction material, or the material utilized for specific components of your
choice. See Stainless Steel Options on page 14.
■ Axial-flow fans require only half the operating hp of blower-type fans. The Marley
drive system features all-aluminum sheaves, matched belts, and long-life bear-
ings 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 fluid cooler fan. They are sometimes
applied at horsepowers significantly beyond their nameplate rating.
Unless otherwise specified, motor speed will be 1800 RPM, 60 Hertz on stan-
dard models.
■ The exclusive Marley System5 Geareducer® requires no oil changes for five
years, offering you unmatched reliability and low maintenance.
➠
(44 paginas)
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