IP 135: Determination of rust-preventing characteristics of steam-turbine oil in the presence of water

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  • Method adopted/last revised: 2006
  • Method reapproved: None
  • REF/ISBN: IP135-2939444
  • Status: Current
  • First printed in STM books: February 2006


This standard specifies a method for evaluating the ability of inhibited mineral oils, particularly steam-turbine oils, to aid in preventing the rusting of ferrous parts should water become mixed with the oil. This method can also be used for testing other oils, such as hydraulic oils and circulating oils and provision is also made in the method for testing heavier-than-water fluids.

NOTE 1 - Until 2003, it was customary to run the test for 24 h. A round robin using different test times showed that no statistically significant differences in rating were found, for any sample, between the 4 h and 24 h results. The results of the round robin with modified test duration are held at the Energy Institute.

NOTE 2 - The test duration may, with the agreement of the contracting parties, be for a shorter or longer period.

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