Perkins 4012TESI Series, Руководство пользователя, Страница: 19 / 57

LUBRICATING OIL
4012/16 Gas, February 1998 15
The following should be regarded as critical parameters:
Viscosity at 100°C
16.5 cSt maximum
Insolubles 1.5 maximum
Total Acid Number (TAN) less than 4 times the TAN value for new oil.
Total Base Number (TBN) 50% less than new oil value.
Total base number (TBN) and total acid number (TAN) must not cross over.
Nitration
25 maximum
Oxidation 25 maximum
Water 0.2% maximum
Iron Less than 20ppm*
Copper Less than 40ppm*
NB Oil samples should be taken from the mean level in the engine sump never from the
sump drain plug.
Should there be a lubricating oil supply problem or a high sulphur content in the gas, Perkins
Engines (Stafford) Ltd should be contacted to give advice in selecting suitable formulations.
OIL CHANGE PERIOD (BIOGAS ENGINES)
Engines that are operated on either digester gas or landfill gas are to be subjected to special
conditions regarding the oil change periods.
When the engine/s are first commissioned an analysis of the site gas is to be submitted to
Perkins Engines (Stafford) (this is addition to the analysis supplied at the order stage) and
a description of the proposed lubricating oil that is to be used.
When the engine starts operating it is essential that oil samples are taken at intervals of
every 150 hours with the result of the analysis being sent to Perkins Engines (Stafford) at
the earliest opportunity.
This course of action is necessary because of the variability of the gas. If the oil is allowed
to be used after it has deteriorated beyond the limits specified below then the engine may
be damaged. The warranty on the engine is dependant on the oil being maintained in
satisfactory condition. To meet this requirement it is necessary to continue the oil analysis
programme throughout the warranty period. The frequency of the analysis can be extended
but it must show that at the oil change point that the oil is still in acceptable limits.
CRITICAL PARAMETERS
Maximum viscosity at 100°C 16.5 cSt
Total acid number and total base number must not cross over
TBN must not reduce to less than 50% the value of new oil
Nitration must not exceed
25
Oxidation must not exceed 30
Insolubles >3 µ must not exceed 1.5
Water max % 0.2
Silicon max ppm 100
Sodium max ppm 50
Iron max ppm 35*
Copper max ppm 35*