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46
SEBU8430-02
Maintenance Section
Fluid Recommendations
For sour gas applications, it is critical to maintain the
oil and gas in the engine to avoid bearing material
being attacked by acids in the gas/oil. To prevent this
type of issue, it is important to work with an oil
supplier to select the most appropriate oil.
Perkins recommends that regular oil sampling and
analysis should be used to ensure that the Total Base
Number / Total Acid Number (TBN / TAN) do not
cross. If the TBN/TAN does cross, Perkins
recommends that the oil is changed immediately.
Minimum TBN and maximum TAN will need to be
agreed with the oil supplier prior to testing.
It is important to work with an oil supplier or Perkins
distributor to select the most appropriate oil based on
your application.
Perkins recommends:
Engines that operate on natural gas should be
lubricated by oils that have a nominal sulphated ash
content of 0.6% by weight.
Sour gas engines should be lubricated by oils that
have a nominal sulphated ash level of 0.6 to 1% by
weight.
Oil sampling can be carried out every 100 hours.
Certain properties of the oil require monitoring. The
sampling rate can be shortened to every 50 hours if
adverse trends occur. Perkins fluid sampling is
available. Contact your Perkins distributor for more
information. Alternatively, your oil supplier may offer
a fluid sampling program.
Once a safe trend can be established, a service
schedule can be introduced, but must be approved
by your Perkins distributor or oil supplier.
The Total Acid Number (TAN) limit value should not
be greater than the Total Base Number (TBN). The
TBN limit value is a minimum of 2 mg KOH/g.
If there is any sign of Strong Acid Number (SAN),
change the oil immediately.
i08462876
Fluid Recommendations
(Fuel Specification)
Gas Specification
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