4500P-7500 USER MANUAL SECTION 4
52
has a high amount of dissolved oxygen and a low pH
level.
Biological/organic fouling (slime) is relatively
uncommon since the compressor’s cooling fluids are
hot enough to generally prevent this type of problem.
Chemical treatments are available to rid the system
of biological contaminants.
SEAWATER-COOLED SYSTEMS
A strainer must be installed the system’s inlet piping
to ensure the supply water is clean. Sullair also
recommends installing a solenoid valve (normally
open) on the system’s outlet side. Both inlet and
outlet lines should have isolation valves with side
drains installed.
An orifice plate must be installed in the piping at least
3.3 feet (1M) before the cooler. The orifice’s diameter
must be properly sized to ensure that the
recommended flow rate is not exceeded (See Table
4-4).
The cooling system should be set up to limit damage
from oil cooler leaks:
• Maintain the minimum system oil pressure
at a level higher than the cooling seawater
pressure. This will prevent oil contamina-
tion in the event of a leak.
• Isolate the coolers from the input line (sea-
water) when the hydraulic system is not in
use.
• The cooler’s seawater outlet pipe should
have an open path to the waste piping.
OUTDOOR INSTALLATION (SHELTERED)
Compressor packages installed in locations where
they will be exposed to outside elements must be
equipped with a TEFC motor. Standard compressors
have water tight controls that are NEMA 4 rated and
are suitable for this type of installation.
The compressor should be mounted on a concrete
pad. If the pad is not level, the compressor must be
mounted in such a manner that its base or skid is
level in relation to the pad’s surface and fully
supported.
An optional weather hood should be installed to
protect the compressor from precipitation. If the
compressor will exposed to blowing rain or snow, it
should be housed in a covered, four-walled
enclosure.
• Sheltered air-cooled machines must have
their exhaust air vented outside of the
enclosure.
• Installations consisting of more than one
compressor should be done in such a man-
ner that each compressor’s exhaust is
directed away from the air intakes of other
compressors or air dryers.
• A standard compressor should not be
started if the ambient temperature is 35°F
(1.7°C) or lower, or may decrease below
that point.
• Compressor’s operated in sub-freezing
conditions must utilize the cold weather
package. Consult the factory for further
information.
NOTE
Seawater-cooled systems must be installed with
with the optional copper-nickel coolers.
NOTE
Routine water testing will extend the
compressor’s operational life and help maintain
an acceptable performance level. Refer to Table
4-3: Water Tests.
NOTE
The maximum recommended flow rate cannot be
exceeded. An excessive flow rate can cause rapid
system failure.
Table 4-4: Orifice Plate Diameters for Sea-
water Flow
Seawater Pres-
sure
psi (bar)
Orifice diameter in inches (mm) to
give a maximum seawater flow or 58
US gal/ min (220 l/min)
25 (1.7) 0.81 (20.5)
35 (2.4) 0.75 (19)
45 (3.1) 0.70 (18)
55 (3.8) 0.67 (17)
65 (4.5) 0.64 (16.3)
75 (5.2) 0.62 (15.7)
NOTE
VSD compressors are NEMA 12 rated which
makes then unsuitable for outside installation or
in locations where they will be exposed to
outside elements.
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