Wartsila 46F - Page 98

7.3.3 Suction strainers (2F01, 2F04, 2F06)
It is recommended to install a suction strainer before each pump to protect the pump from
damage. The suction strainer and the suction pipe must be amply dimensioned to minimize
pressure losses. The suction strainer should always be provided with alarm for high differential
pressure.
Design data:
0.5...1.0 mmFineness
7.3.4 Lubricating oil pump ( 2P04)
The stand-by lubricating oil pump is normally of screw type and should be provided with an
safety valve.
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.
16V46F14V46F12V46F9L46F8L46F7L46F6L46F
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
7-12 DAAB605814
Wärtsilä 46F Product Guide7. Lubricating Oil System