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Wartsila ?31DF Series Product Manual
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7.2.4 Pre-lubricating oil pump (2P02)The pre-lubricating oil pump is a scew or gear pump, which is to be equipped with a safetyvalve.The installation of a pre-lubricating pump is mandatory. An electrically driven main pump orstandby pump (with full pressure) may not be used instead of a dedicated pre-lubricatingpump, as the maximum permitted pressure is 200 kPa (2 bar) to avoid leakage through thelabyrinth seal in the turbocharger (not a problem when the engine is running). A two speedelectric 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, whenthe 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 pumpand the geometric suction height must be specially considered with regards to high viscosity.Design data:see Technical dataCapacity350 kPa (3.5 bar)Max. pressure (safety valve)100°CDesign temperature500 cStViscosity for dimensioning of the electricmotor7.2.5 Pressure control valve (2V03)Design data:1.0 MPa (10 bar)Design pressureDifference between pump capacity and oil flow through engineCapacity100 °CDesign temperature7.2.6 Lubricating oil pump, stand-by (2P04)The stand-by lubricating oil pump is normally of screw type and should be provided with ansafety valve.Design data:see Technical dataCapacity0.8 MPa (8 bar)Design pressure, max100°CDesign temperature, max.SAE 40Lubricating oil viscosity500 mm2/s (cSt)Viscosity for dimensioning the electricmotor7.3 Crankcase ventilation systemThe purpose of the crankcase ventilation is to evacuate gases from the crankcase in order tokeep the pressure in the crankcase within acceptable limits.7-8 DBAE248994Wärtsilä 31DF Product Guide7. Lubricating Oil System |
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