be designed for a water working pressure of 862 kPa (125 psi) 125 psi and
both valve stems and seat disks shall be constructed of brass or other
approved corrosion resisting material. Continuous bleed-off assembly or
automatic flush system shall be provided. This system shall be adjustable
to limit the concentrations from three to ten times the incoming water
concentration.
2.13
CABINETS
Galvanized steel sheets, stainless steel or polymeric material shall be
used in the construction of cabinets. Outside air inlets shall be
protected with bird screens that conform to ASTM E 2016, Type I, Class 1, 2
by 2 mesh, 1.6 mm 0.063 inch diameter aluminum wire or 0.8 mm 0.031 inch
diameter stainless steel wire. Cabinets shall provide access to all moving
parts including fans, pumps, and float valves.
2.13.1
Metal Cabinets
Where possible, cabinets shall be factory assembled by either welded or
bolted and screwed construction. Cabinets shall be braced and reinforced.
Bolts, screws, hinges, trim, and other metal appurtenances shall be cadmium
plated or galvanized in accordance with ASTM B 696 or ASTM A 123/A 123M.
When it is necessary to ship the unit disassembled, the cabinet sections
shall be designed for assembly with cadmium plated or galvanized bolts.
[The interior and exterior of the galvanized steel cabinet, including
hinges, handles, and other trim, shall be cleaned and chemically treated to
assure paint adhesion.] The interior bottom of cabinet shall be [factory]
[field] coated with coal tar based enamel or epoxy and shall meet the
requirements of SSPC PS 10.01 or SSPC Paint 16. [Galvanized surfaces
damaged during fabrication or handling shall be given a coat of zinc-rich
paint. Finish shall be as specified in paragraph PAINTING AND FINISHING.]
Gauge of cabinet components shall be as indicated in TABLES I and II.
TABLE I.
STEEL CABINET (MINIMUM THICKNESS mm)
Nominal Size of Industry Standard Air Rating
Component part
0/1650
1651/2600
2601/0
3301/7500
of cooler
L/s
L/s
L/s
L/s
Water tank
0.85
0.85
1.0
1.3
Corner posts
0.75
0.75
0.75
1.0
Sides
0.85
0.85
0.85
0.85
Louver pad holder
0.5
0.5
0.5
0.5
Blower scroll
0.75
0.85
1.0
1.0
Blower wheel
0.85
0.85
0.85
1.0
Drip trough
0.5
0.55
0.55
0.55
Top
0.85
0.85
1.0
1.0
SECTION 15690A
Page 16
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