IP 229: Determination of the relative oxidation stability by rotating bomb of mineral turbine oil copy

This standard specifies a method for the estimation of the oxidation stability of unused turbine oils having the same composition (base stock and additives) and for controlling the continuity of this property from batch to batch.

Appendix X1 describes a new optional turbine oil unused sample nitrogen purge pretreatment procedure for determining the percent residual ratio of RPVOT value for the pretreated sample divided by the RPVOT value of the new untreated oil, sometimes referred to as a percent RPVOT retention.

This nitrogen purge pretreatment approach was designed to detect volatile antioxidant inhibitors that are not desirable for use in high temperature gas turbines.

NOTE 1 -- The method is not intended to be used to estimate the service life of new oils, especially those of varying compositions, nor is it intended to be a substitute or a replacement for any method for determining the oxidation characteristics of inhibited mineral turbine oils, or a rapid means of estimating the results to be obtained from such methods. It is not intended that this test method be a substitute for Test Method D943 or be used to compare the service lives of new oils of different compositions.

NOTE 2 -- The method can be used for estimating the remaining oxidation test life of in-service mineral turbine oils by comparison of the result obtained with that for the new oil.