Refinery Lubricant Regeneration Case Study CONTEXT & OBJECTIVES Operator: Large European refineryoperating a turbine and two critical processgas compressors.Issue: ISO code drift from 17/16/15 to20/19/18, initially misinterpreted asparticulate contamination.Standard diagnosis: MPC value considered acceptable No abnormal wear detected Full system flushing recommended Objectives: Identify the real root cause,characterize degradation by-products, andavoid unnecessary system flushing FINDINGS