TABLE 4-3 WATER TESTS
Substances Test Interval Acceptable Concentration
Corrosivity Hardness, pH, Total Dissolved
Solids, Temperature at inlet, Alkalinity
Monthly - if stable for 3 to 4 months, analyze
quarterly.
Langelier Index 0 to 1
Iron Monthly < 2 ppm
Sulphate Monthly < 50 ppm
Chloride Monthly < 50 ppm
Nitrate Monthly < 2 ppm
Silica Monthly < 100 ppm
Desolated Oxygen Daily - if stable, analyze weekly 0 ppm (as low as possible)
Oil & Grease Monthly < 5 ppm
Ammonia Monthly < 1 ppm
Seawater-Cooled Units
NOTE
If seawater is to be used for cooling,
optional copper-nickel coolers must
be selected.
Water cleanliness is critical for operation of the
compressor. A strainer must be installed in the inlet piping
of the water system. It is also recommended that a
solenoid valve (normally closed) be installed into the water
outlet side of the compressor system. Consult the Sullair
Service Department for assistance in setting up these
recommended precautionary functions. In addition, be
aware that cleaning of coolers as a result of fouling is a
customer responsibility.
Isolation valves with side drains should be installed on
both the inlet and outlet lines.
The recommended flow rate cannot be exceeded. An
orifice plate must be installed in the pipe-work at least
3.3 ft (1 m) before the cooler. The orifice size must be
calculated to ensure that the maximum seawater flow rate
cannot be exceeded. Without these precautions, the
seawater flow rate through the cooler may be several times
the recommended maximum, which will lead to rapid
system failure.
Seawater pressure
psi (Bar)
Orifice diameter in inch
(mm) to give a maximum
seawater flow or 40 US gal/
min (152 l/min )
25
(1.7) 0.675 (17)
35 (2.4) 0.62 (16)
45 (3.1) 0.58 (15)
55 (3.8) 0.55 (14)
65 (4.5) 0.53 (13.5)
75 (5.2) 0.51 (13)
No oil cooler manufacturer can guarantee that its products
will have an indefinite life and for this reason, we suggest
that the cooling system be designed to minimize any
damage caused by oil cooler leaking. This can be
achieved as follows:
1. The oil pressure should be maintained at a pressure
higher than the seawater pressure. In the event of a
leak occurring, the oil will be prevented from becoming
contaminated.
2. When the hydraulic system is not in use, the coolers
should be isolated from incoming seawater under
pressure.
3. The seawater outlet pipe from the cooler should have
an open run to waste piping.
Outdoor Installation (Sheltered)
Many times a compressor must be installed outside due
to available space or other jobsite conditions. When this is
necessary, there are certain items that should be
incorporated into the system to help ensure trouble-free
operation. The unit must be purchased with a TEFC motor.
The standard machine has NEMA4 rated controls, which
are watertight.
NOTE
Variable speed drive compressors are
NEMA 12 rated and must not be
installed outside or exposed to the
elements.
The compressor should be on a concrete pad, which is
designed to drain water away from it. If the concrete pad
is sloped, then the compressor must be mounted so that
it is level. The base or skid must be fully supported where
it contacts the concrete pad.
A weatherhood option should be selected to prevent direct
rain and snow from falling on the unit. If local weather
conditions can be extreme such that direct rain or snow
may fall on the unit, it should be in a fully enclosed room
or building.
SECTION 4
54
3000-4500 Operator’s Manual and Parts List
®SULLAIR®
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