TS20C USER MANUAL SECTION 4
104
to Table 4-3: Water Tests.
SEAWATER-COOLED UNITS
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 Sulliar Service Department for
assistance in setting up these recommended
precautionary functions. In addition, be aware the
cleaning of coolers as a result of fouling is a
customer responsibility.
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.
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:
The oil pressure should be maintained at a pressure
higher that the seawater pressure. In the event of a
leak occurring, the oil will be prevented from
becoming contaminated.
When the hydraulic system is not in use, the coolers
should be isolated from incoming seawater under
pressure.
The seawater outlet pipe from the cooler should have
an open run to waste piping.
Table 4-3: Water Tests
Substances Test Interval Acceptable Concentration
Corrosivity Hardiness, pH, Total Dis-
solved Solids, Temperature at inlet,
Alkalinity
Monthly-if stable for 3 to 4 months,
analyze quarterly
Langerlier 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
NOTE
If seawater is to be used for cooling,
optional copper-nickel coolers must be
selected.
Seawater
Pressure
psi (bar)
100/150HP 200/250HP
Orifice size for 80 GPM
orifice diameter in inch
(mm) to give a maximum
seawater flow of
80 GPM (302.8 l/min)
Orifice size for 160 GPM
orifice diameter in inch
(mm) to give a maximum
seawater flow of
160 GPM (605.6 l/min)
25 (1.7) .95 (24.1) 1.35 (34.3)
35 (2.4) .88 (22.4) 1.24 (31.5)
45 (3.1) .82 (20.8) 1.16 (29.5)
55 (3.8) .78 (19.8) 1.10 (27.9)
65 (4.45) .75 (19.1) 1.06 (26.9)
75 (5.2) .72 (18.3) 1.02 (25.9)
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