RP084 -
Investigations of Lubricant Sludge Formation in the Field:
Development of an Effective New Fleet Test Technique, Lubrizol
Corporation, S.Jaynes, M.F.Salmon, A.Riga, R.E.Kornbrekke
and K.E.Davis
ABSTRACT
A new field
test procedure for evaluation of the sludge formation tendencies
of lubricants has been developed. The procedure has the benefits
of short running time, reduced variability, and dramatic separation
of API SF vs API SG oils. This paper discusses development
of the operational procedure and evaluation of four lubricants,
including commercial-type API SF and API SG oils as well as
experimental future oils. Significantly improved sludge ratings
were obtained with an experimental API SG oil.
The sludge formation
process was studied using infrared spectroscopy, TAN, dielectric
measurements, viscosity, quasielastic light scattering particle
size, and transmission electron microscopy techniques. These
analyses show production of contaminants which form insoluble
particles that build up and precipitate out of suspension as
sludge. Certain drain analyses can be used as tools for predicting
field sludge deposition time. Finally, sludge formation in
the field test and the ASTM Sequence VE engine test are compared.
Return
to Top
|
