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7.0 INSTALLATION
7.5 SEA WATERCOOLED UNITS SELECTED UNITS ONLY
Water cleanliness is extremely important. Strainers are
available from Ingersoll Rand. 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.
A normally closed solenoid valve is fitted to the water
outlet side of the compressor package.
It is important to ensure that the recommended flow
rate cannot be exceeded. This will normally mean that an
orifice plate must be fitted in the pipework at least 1m
(3.3ft) before the cooler, with the orifice size calculated to
ensure that the maximum sea water flow rate cannot be
exceeded. If these precautions are not taken, it is possible
that the sea water flow rate through the cooler may be
several times the recommended maximum, which will
lead to rapid failure.
Sea Water Pressure Bar
(psi)
Orifice diameter in mm
(inch) to give a maximum
sea water flow of 90l/min
(23.76 US gall/min)
3 (43.5) 12 (0.472)
4 (58) 11 (0.433)
5 (72.5) 10 (0.394)
6 (87) 9.6 (0.378)
7 (101.5) 9.2 (0.362)
8 (116) 8.9 (0.35)
9 (130.5) 8.7 (0.343)
10 (145) 8.4 (0.33)
No oil cooler manufacturer can guarantee that its
products will have an indefinite life and for this reason, we
suggest that the cooling system is designed to minimize
any damage caused by a leaking oil cooler. This can be
achieved as follows ;
The oil pressure should be higher than the sea water
pressure, so that in the event of a leak occurring, the
oil will not be contaminated.
If the sea water pressure is 100PSIG (7BARG) or above
it is recommended that the water solenoid valve is
changed to the water inlet side. This will protect the
system from high pressure surges when not in use.
The sea water outlet pipe from the cooler should
have a free run to waste.
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