The Centrifugal purifier is widely used for the maintenance of marine diesel engine system oil. The effects of purifing conditions on the properties of treated oils and the measuring method of insoluble contents in treated oils were studied. Three samples of used oil obtained from ships were treated by means of Sharples Gravitrol Centrifuge (TOMOE DH-500) set up on laboratory bench. The following results were obtained;
1) Water content in treated oils slightly increased with increase in wash water quantity, oil flow rate and oil viscosity. The water content remained less than 1%. Wash water temperature had no effect on water content in treated oils.
2) Neutralization number of treated oils was not changed in the various operating conditions.
3) The removability of the insolubles in used oils principally depends on their particle size and density, and was not much affected by the treating conditions.
4) The removal rate of insolubles by centrifugal purification could be estimated by means of laboratory high speed centrifuge (HITACHI 20P-2) .“Precipitation Constant”proposed by the authors is useful for this estimation.
View full abstract