2.5.5.1
Pumps
Pump casing shall be designed to withstand discharge head indicated, plus
static head on system, plus 50 percent of the total, but not less than 862
kPa (gage) 125 psig. Motor shall not be overloaded with pump operating at
any point on its characteristic curve, and shall have [open drip-proof]
[totally enclosed] enclosure. Pump speed shall not exceed [1800] [3600]
revolutions per minute. Pumps shall be [horizontal split-case]
[end-suction vertical split-case] [close-coupled in-line] centrifugal type.
Casing and bearing housings shall be cast ferrous metal. Casing shall be
fitted with manual air vents and drain plugs. [Suction and discharge shall
be provided with pressure gage taps.] Shaft seal shall be mechanical type.
Impeller and trim shall be bronze. Shaft shall be stainless steel or
carbon steel sleeved with stainless steel. Bearings shall be sealed,
grease lubricated, antifriction type. Pump shall be accessible for
servicing without disturbing piping connections. [Pump and motor shall be
mounted on a common cast iron or fabricated structural steel base having
lipped edges and tapped drainage openings.] [Pump shall be provided with
elastomer-in-shear type shaft coupling with guard.] [Close-coupled pumps
shall be provided with drip pockets and tapped openings.] Pump rotating
assembly shall be dynamically balanced.
2.5.6
[Evaporative condenser coil shall comply with ASHRAE 15]. Coils shall be
completely drainable [serpentine] [or] [straight length, individually
cleanable] type. Coil tubes and headers shall be [seamless deoxidized
copper] [or] [electric resistance welded, hot rolled, mill scale free,
carbon steel tube and header, externally hot-dip galvanized after
fabrication to provide not less than 0.70 kg of zinc per square meter 2.3
ounces of zinc per square foot of single side surfaces]. [Coil tubes shall
be Schedule 40 carbon steel, internally cleaned to remove mill scale and
particulate and externally hot-dip galvanized after fabrication to provide
not less than 0.70 kg of zinc per square meter 2.3 ounces of zinc per
square foot of single side surfaces.] [[Split- ] [Multi] [circuit] ]
[desuperheater] [subcooling] [refrigerant and jacket cooling water] coils
shall be provided as indicated. [Refrigerant subcooling circuit shall
produce [_____] degrees C degrees F of subcooling.] Refrigerant receiver
shall conform to requirements of ARI 495. [Receiver insulation shall be
not less than 25 mm 1 inch thick, 100 percent adhesive bonded, flexible,
closed-cell elastomer, and finished with two coats of solvent base PVC
protective coating.] [Copper coils shall) be dielectrically isolated.]
Header connections shall be fitted with [thermometer wells,] [pressure gage
taps,] and [manual] [automatic] vent connections. Heat exchanger shall be
pressure and temperature rated and tested to the same fluid service
standards and codes as connecting external piping.
2.5.7
Fill
Fill for cooling tower shall be minimum [0.38 mm15 mil thick corrugated or
molded PVC plastic] [0.48 mm19 mil thick chloroprene bound asbestos sheet],
in honeycomb or wave form, impregnated with melamine or chlorinated rubber,
having an ASTM E 84 flame spread rating of 5 or less. Fill shall be
supported to prevent sagging or misalignment.
2.5.8
Eliminators
Metal eliminators shall be not less than 24 gage steel.
Nonmetallic
SECTION 15602N
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