7.3.4 Lubricating oil pump (2P04)
A lubricating oil pump of screw type is recommended. The pump must be provided with a
safety valve.
Some classification societies require that spare pumps are carried onboard even though the
ship has multiple engines. Stand-by pumps can in such case be worth considering also for
this type of application.
Design data:
see Technical dataCapacity
1.0 MPa (10 bar)Design pressure
800 kPa (8 bar)Max. pressure (safety valve)
100°CDesign temperature
500 cStViscosity for dimensioning the electric
motor
Example of required power, oil temperature 40°C. The actual power requirement is determined
by the type of pump and the flow resistance in the external system.
16V46DF14V46DF12V46DF9L46DF8L46DF7L46DF6L46DF
78786560505045Pump [kW]
87877575555555Electric motor [kW]
7.3.5 Pre-lubricating oil pump (2P02)
The pre-lubricating oil pump is a separately installed scew or gear pump, which is to be
equipped with a safety valve.
The installation of a pre-lubricating pump is mandatory. An electrically driven main pump or
standby pump (with full pressure) may not be used instead of a dedicated pre-lubricating
pump, as the maximum permitted pressure is 200 kPa (2 bar) to avoid leakage through the
labyrinth seal in the turbocharger (not a problem when the engine is running). A two speed
electric motor for a main or standby pump is not accepted.
The piping shall be arranged so that the pre-lubricating oil pump fills the main oil pump, when
the main pump is engine driven.
The pre-lubricating pump should always be running, when the engine is stopped.
Depending on the foreseen oil temperature after a long stop, the suction ability of the pump
and the geometric suction height must be specially considered with regards to high viscosity.
With cold oil the pressure at the pump will reach the relief pressure of the safety valve.
Design data:
see Technical dataCapacity
350 kPa (3.5 bar)Max. pressure (safety valve)
100°CDesign temperature
500 cStViscosity for dimensioning of the electric
motor
7-16 DBAD209883
Wärtsilä 46DF Product Guide7. Lubricating Oil System
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