Author Archives: Khashayar Hajiahmad

THE VARNISH WORLD CUP Turbine Oil Varnish Removal Championship A turbine plant enters the biggest reliability match of the year: TEAM CLEAN OIL vs. FC VARNISH The players are: Khash — Head Coach / Lubrication StrategistMaintenance Team — Defenders and field techniciansReliability Team — Midfield analysts and trend readersOEM — Referee / VAR technical authorityProcurement — Goalkeeper controlling budget andContinueContinue reading “THE VARNISH WORLD CUP – Khash Comic Series”

A turbine engineer sent me above photos and asked Khash ==> Journal or Bearing ? Which place varnishing happens first ? Needing a detailed article on it  Khash Replied Direct answer The bearing is the stationary sleeve/pad/shell around it. In a hydrodynamic/plain journal bearing, the shaft journal is supported by an oil wedge, and under correct operationContinueContinue reading “Journal or Bearing ? Which place varnishing happens first ?”

Advanced Tribology in Turbomachinery Lubrication Same article in two levels: engineering level + 10-year-old level 1. Why tribology matters in turbomachinery Advanced version:Turbomachinery includes turbines, compressors, turbochargers, pumps, and high-speed generators. These machines rotate extremely fast, so the shaft must be supported without metal surfaces rubbing directly. Tribology—the science of friction, wear, and lubrication—is thereforeContinueContinue reading “Advanced Tribology in Turbomachinery Lubrication Same article in two levels: engineering level + 10-year-old level”

All Possible Sampling Points in Turbomachinery: Why Each Location Can Show a Different MPC Varnish Potential Level Oil analysis is only as good as the sample that reaches the lab. In turbomachinery lubrication systems, this point is especially important because the oil is not chemically or physically identical everywhere in the system at the sameContinueContinue reading “All Possible Sampling Points in Turbomachinery: Why Each Location Can Show a Different MPC Varnish Potential Level”

Delta L and the Black MPC Patch in Turbine-Oil Varnish Potential Testing 1. What MPC varnish testing is measuring The common varnish potential test for turbine oils is Membrane Patch Colorimetry, or MPC, covered by ASTM D7843. The method extracts insoluble contaminants from an in-service turbine-oil sample onto a membrane patch, then measures the patch color withContinueContinue reading “Delta L and the Black MPC Patch in Turbine-Oil Varnish Potential Testing”

A Khash-written technical procurement article When a power plant, LNG facility, refinery, petrochemical complex, pipeline compressor station, or offshore asset decides to outsource turbomachinery oil filtration, the tender must not be written as a request for “filtering services.” That wording is too weak. It invites a low-cost bidder with a filter cart, a few hoses,ContinueContinue reading “How a Large Power Plant or Oil & Gas Company Should Tender Outsourced Turbomachinery Oil Filtration Services”

How to Specify a Turbine Oil Varnish Removal Filtration Unit in a Tender A Khash-written technical article A turbine oil varnish removal unit must never be specified as a simple filtration skid. That is the first procurement mistake. Varnish is not only a particle problem; it is an oil-chemistry saturation problem. The tender must thereforeContinueContinue reading “How to Specify a Turbine Oil Varnish Removal Filtration Unit in a Tender”

Turbine Oil Analysis Crossword Puzzle When I was a kid , My Grand Pa Use to Solve the newspapers crossword puzzles. After 35 years from those days, Khash made a crossword puzzle on Turbine Oil Analysis 😉 Email me your answers to ==> khash@turbineoilreliability.com to send you the corrected puzzle answers #Knowledge#Lubrication#Turbomachinery

Effect of Varnish Layers on Rolling Bearings and Service Life Abstract In a rolling bearing, service life depends on maintaining a stable elastohydrodynamic or mixed-lubrication film between rolling elements and raceways while controlling contamination, heat, cage sliding, and lubricant degradation. A varnish layer is harmful because it is not a load-rated bearing material, not aContinueContinue reading “Effect of Varnish Layers on Rolling Bearings and Service Life”

I have been working for some time to offer this online course for Noria and faced challenges that I would explain in this article. https://turbineoilreliability.com/2026/05/13/%f0%9f%9a%80-machinery-lubrication-level-i-online-training-course/ Why Noria Lubrication Training Delivered by Khash Is Different from Typical ICML Exam Preparation In the lubrication training market, many providers now offer ICML exam preparation. Some are priced attractively,ContinueContinue reading “Why Noria Lubrication Training Delivered by Khash Is Different from Typical ICML Exam Preparation”