electric thermostatically controlled immersion heater.
Provide lifting
lugs and tie downs.
2.7.1.2
Air Filter
Provide a dry type air filter constructed of pleated filter paper with
protective stainless steel cloth on each side. Filter shall also act as a
muffler and shall be readily removed for cleaning.
2.7.1.3
Intercooler and Aftercooler
Compressed air intercooler and aftercooler heat exchangers shall each be
water cooled, with counter current flow, and shall be integrally mounted
with no external air piping between compressor cylinders and cooler.
Design heat exchangers to cool the total output air flow of the compressor
to within 9 degrees C 15 degrees F of the inlet cooling water temperature.
The tube bundles shall be removable for cleaning and inspection.
2.7.1.4
Air Receiver
Vertical tank with a minimum volume of [1585] [1840] [2717] liters [56]
[65] [96] cubic feet. Design unit for [1034] [1724] kPa (gage) [150] [250]
psig working pressure in accordance with the ASME BPVC SEC VIII. A
receiver bearing the ASME Code Symbol stamp will be accepted as meeting
these requirements. Provide an automatic condensate trap, safety valve,
outlet connection, and a 114 mm 4 1/2 inch pressure gage ([1379] [2068] kPa
(gage)[200] [300] psig range).
2.7.1.5
Electric Motor
Motor shall be [totally enclosed fan cooled], [open-drip proof], [_____] kW
hp, [_____] volts, [_____] phase, 60 Hz as specified under paragraph
entitled "Motors and Drives" in this section. Control circuits for motor
shall be nominal 120 volts. [Provide removable totally enclosed belt
guard.]
2.7.1.6
Controls
Provide controls and shutdowns necessary for automatic operation of the
compressor package. House controls in NEMA 12 control cabinet. Controls
shall consist of alarm and running lights, push buttons and selection
switches for automatic dual control, 120 volt control transformer connected
to power circuit serving the compressor, along with necessary time delay
and control relays, and indicators. Provide automatic solenoid-operating
cooling
a.
Start-and-Stop Control: When set for start and stop control,
motor shall stop automatically when discharge pressure reaches
maximum pressure setting and start automatically when discharge
pressure falls to minimum setting. Cylinders shall unload during
periods of motor shutdown.
b.
Constant Speed Control: Compressor shall operate continuously at
constant speed. Provide means to automatically load and unload
compressor at preset minimum and maximum pressure settings
respectively. Provide means for automatic release of pressure
within cylinders when the unit is operating without load. Also
provide means for manual or automatic unloading of cylinders
during starting of unit. Equip each compressor with a timed
SECTION 15502N
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