Raw Water System
Water
circulation from the seawater system cools:
•
engine coolant
•
engine oil
•
charge air
•
drive unit oil
•
exhaust
The water is drawn in through an intake in the hull and
is led via a filter to the engine. From there the water
enters the exhaust hose and leaves via the IPS drive.
Volvo Penta cooling systems are designed for max
seawater temperatures of 32 °C (90 °F).
Seawater inlet
Seawater inlets should preferably be made in bronze
alloy (brass is unsuitable as it corrodes owing to its
high zinc content). However, in the case of steel hulls,
the same material the boat is made of may be used. If
the materials in the hull and seawater inlet are dissim-
ilar, it may be necessary to electrically insulate the inlet
from the hull to avoid galvanic corrosion.
The seawater inlets, sea cocks and strainers must
have sufficiently high flows to avoid capacity losses
and a consequent reduction in water supply to the
pump. The difference in negative pressure at the sea-
water pump inlet may not exceed 30 kPa (4.35 psi).
The seawater inlet must have a diameter that fits a
hose with an internal diameter of 63 mm (2½"):
The seawater inlet strainer must have a minimum flow
cross section of: 1.5 x hose cross section area.
Seawater inlets must be located deep enough so that
they remain underwater even when the boat rolls or is
moving through heavy seas.
IMPORTANT!
Seawater inlets must be installed ahead of the
engines, close to the keel. Avoid placing seawater
inlets in line with propellers.
Installation, Volvo Penta IPS
47704162 10-2014 © AB VOLVO PENTA 101
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