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Rawwater system
WARNING! The rawwater system (LT-Circuit) must be closed and drained before commencing work on the
system. This due to the risk of seawater or water from the central cooling system entering the vessel.
Maintenance: Rawwater system
Draining the rawwater system
(LT-circuit)
1. Close the in- and outlet cocks.
2. Open the drains, refer to section "Drain points",
and allow the water to drain.
IMPORTANT! Check that the water really
drains. Deposits may need to be removed from inside
the drain plugs.
Rawwater pump (LT-pump)
impeller
Checking and changing
IMPORTANT! Always keep a spare impeller and
gasket in store aboard the ship.
1. Close the raw water cocks and drain the external
cooling water as described in the chapter draining
the raw water system.
2. Remove the pump end cover (1), the seal (2), and
the impeller(3).
3. Inspect the impeller. Change the impeller if there
are any visible cracks or other defects.
4. Clean the inside of the housing. Lubricate the
pump housing and the inside of the cover with
water-resistant grease (non-aggressive on rub-
ber).
5. Push the impeller into position while rotating it in
the normal operating direction.
6. Fit the cover with a new seal.
7. Open the raw water cocks.
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