Lubricating oil life at elevated temperatures
Lubricating oil life at elevated temperatures
(OP)
We use Mil-Spec grade 2190-TEP lubricating oil in numerous machinery bearing applications. I've heard a general "rule of thumb" that the service life of this oil is halved for every 18 to 20 degrees above 150 degrees F. Does anyone know of any test data or other more formal information that can back up this rule of thumb?
Thanks in advance for pointing me in the right direction.
Jim
Thanks in advance for pointing me in the right direction.
Jim





RE: Lubricating oil life at elevated temperatures
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RE: Lubricating oil life at elevated temperatures
RE: Lubricating oil life at elevated temperatures
ht
Nonetheless at 100ºC, the Arrhenius equation does yield about a factor of 2 degradation for a 10ºC change.
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RE: Lubricating oil life at elevated temperatures
k1 = A e-E/RT1
k2 = A e-E/RT2
Now take E ~ 80000 J/mol
R= 8.314 J/(mol.K)
A = constant
T1 = = 100oC = 373 K
T2 = 383 K
and divide both equations
k1/k2 = e(80000/8.314)(1/383-1/373) = 0.51
meaning that a 10oC increase doubled the rate.
It is only a "grosso modo" approximation but it gives an idea of the effect of temperature on the rate of oil degradation.
RE: Lubricating oil life at elevated temperatures
RE: Lubricating oil life at elevated temperatures
RE: Lubricating oil life at elevated temperatures
RE: Lubricating oil life at elevated temperatures
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RE: Lubricating oil life at elevated temperatures
Thanks!