RULER (Remaining Useful Life Evaluation Routine) is used to quantify and trend remaining levels of Phenol and Amine anti-oxidant (AO) levels which is one of the factors considered in determining useful oil life. Once phenol AO levels drop below 20% of new, the rate of sludge and deposit formation can potentially increase and the oil may be condemned. Figure 1 shows AO level trending after the installation of SVR1200 on a combustion turbine lu

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