The lubricating oil system begins with pumps drawing oil from the drain tank, which is often located in the double bottom of the ship. The oil passes through filters and a cooler to be cooled and purified before entering the distribution branches throughout the engine. Used oil returns to the drain tank through strainers and is purified again before being recirculated through the system. The drain tank has an air vent to release air and a sounding pipe and level gauge to monitor the oil level.

1. sound 2

2. 2
Drain tank
The position of the drain tank
is often in the double bottom.

3. Drain tank
Pumps draw the lubricant
from the drain tank.

4. 2
The lubricant is led through
filters to the cooler.
cooler
Drain tank

5. sound
2
In the cooler the lubricant is
cooled by fresh water or sea water.
cooler

6. sound
2
Drain tank
Pumps draw the lubricant
from the drain tank.
From the cooler the lub oil
passes through the distribution-
branches in the engine.
Distribution branches

7. s
Distribution Branches

8. In a crosshead engine oil bores run through
the crankshaft, crankwebs and crankpins,

9. sound
so that the oil can flow
from the main bearing to
the crank,
connecting rod,
crosshead,
crosshead guide shoes and
crosshead guides.

10. The oil passes through the main lub-oil
supply line to the bearings.

11. In a trunk engine
the cylinder-lubrication
is done by the
oil mist
thrown up by the crank.
sound

12. sound
2
Used oil is passed through the
strainers (S) before it returns to the
drain tank.
s s s
Drain tank

13. sound
2
strainer
Before the lubricating oil is entered
into the system again, it must be
purified by the strainer in the drain tank.

14. sound
2
Air in the drain tank can escape
through the air vent (breather).
Air vent
(breather)

15. sound
2
The oil-level is indicated with a level gauge
and is measured through a sounding pipe.
Sounding
pipe
Level gauge

16. C P.C. van Kluijven
SHIPPING AND TRANSPORT COLLEGE ROTTERDAM