Specifications
Specification Value
MH Fluid Cooler —
Specifications: Options
15
Stainless Steel Options
All Stainless Steel Fluid Cooler:
1.1: Replace paragraph 1.1 with the follow-
ing: Provide an induced-draft, crossflow-
type, factory assembled, stainless steel,
closed circuit fluid cooler. Unit shall con-
sist of _____ cell(s), as shown on plans.
The limiting overall dimensions of the
fluid cooler shall be _____ wide, _____
long, and _____ high to the top of the
fan guard. Total operating horsepower of
all fans shall not exceed _____ hp. Fluid
cooler shall be similar and equal in all
respects to Marley Model _______.
6.1 Replace paragraph 6.1 with the follow-
ing: Except where otherwise specified, all
components of the fluid cooler shall be
fabricated of heavy-gauge, 301L stain-
less steel. Only low-carbon stainless steel
alloys will be accepted in order to mini-
mize the risk of intergranular corrosion in
the weld zones. The fluid cooler shall be
capable of withstanding water having a
chloride content (NaCl) up to 750 ppm; a
sulfate content (SO
4
) up to 1200 ppm; a
calcium content (CaCO
3
) up to 800 ppm;
silica (SiO
2
) up to 150 ppm. The circulat-
ing water shall contain no oil, grease, fatty
acids, or organic solvents.
Stainless Steel Collection Basin:
12.1: Replace paragraph 12.1 with the follow-
ing: The collection basin shall be welded
301L stainless steel construction. Only
low-carbon stainless steel alloys will be
accepted in order to minimize the risk of
intergranular corrosion in the weld zones.
Suction connections shall be equipped
with stainless steel debris screens. All
steel items which project into the basin
(coil supports, anchor clips, etc) shall also
be made of stainless steel. A factory-
installed, float-operated, mechanical
makeup valve and waste water blowdown
line shall be included. An overflow and
drain connection shall be provided in each
cell of the fluid cooler. The basin shall
include a depressed section into which
accumulated particle debris can be flushed
to permit cleaning. The basin floor adja-
cent to the depressed section shall slope
toward the depressed section to prevent
buildup of debris under the coil area.
■ 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 stain-
less steel's ability to withstand adverse operating conditions.
■ The cold water basin is the only part of the tower that is subject to periods of
stagnant water, concentrated with treatment chemicals and customary contami-
nants. It is also the most expensive and difficult part of any tower to repair or
replace. For these reasons, many customers—particularly those who are replac-
ing older towers—choose to specify stainless steel cold water basins.
(44 paginas)
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