7.3.5 Lubricating oil pump, stand-by (2P04)
The stand-by lubricating oil pump is normally of screw type and should be provided with an overflow valve.
Design data:
see Technical data
Capacity
0.8 MPa (8 bar)
Design pressure, max
100°C
Design temperature, max.
SAE 40
Lubricating oil viscosity
500 mm
2
/s (cSt)
Viscosity for dimensioning the electric motor
7.4
Crankcase ventilation system
The purpose of the crankcase ventilation is to evacuate gases from the crankcase in order to keep the
pressure in the crankcase within acceptable limits.
Each engine must have its own vent pipe into open air. The crankcase ventilation pipes may not be combined
with other ventilation pipes, e.g. vent pipes from the system oil tank.
The diameter of the pipe shall be large enough to avoid excessive back pressure. Other possible equipment
in the piping must also be designed and dimensioned to avoid excessive flow resistance.
A condensate trap must be fitted on the vent pipe near the engine.
The connection between engine and pipe is to be flexible.
Design data:
see Technical data
Flow
see Technical data
Backpressure, max.
80°C
Temperature
Figure 7.6
Condensate trap (DAAE032780)
Minimum size of the ventilation pipe after the condensate
trap is:
W L34DF: DN100
W V34DF: DN125
The max. back-pressure must also be considered when selecting
the ventilation pipe size.
Product Guide Wärtsilä 34DF - 3/2012
77
Product Guide
7. Lubricating Oil System
