Author Archives: Khashayar Hajiahmad

I have always recommended MPC test patch photo to be included in the used turbine oil analysis reports. Turbine Engineer asked : Why MPC test patch photo should always be included in the report and not just MPC value ? Khash Replied: In turbine oil analysis, the MPC test is one of the most important tools for evaluatingContinueContinue reading “Why MPC Patch Photo and Patch Weight Should Be Included in Turbine Oil Analysis Reports”

Construction Details of a Servo Valve and How Oil Varnishing Affects Its Performance and the Hydraulic System 1. Introduction A servo valve is one of the most precise and sensitive components in a hydraulic control system. In turbomachinery, gas turbines, steam turbines, compressors, governors, EHC systems, hydraulic actuators, test rigs, and aerospace-type hydraulic systems, theContinueContinue reading “Construction Details of a Servo Valve and How Oil Varnishing Affects Its Performance and the Hydraulic System”

Artificial Intelligence in Turbine Oil Analysis & Filtration Where AI Can Help… and Where AI Should NEVER Replace Human Expertise The lubrication and turbine oil industry is entering a new era where Artificial Intelligence (AI), Machine Learning (ML), Industrial Internet of Things (IIoT), and predictive analytics are becoming part of reliability programs. For turbine oilContinueContinue reading “Artificial Intelligence in Turbine Oil Analysis & Filtration”

What Does 100 ppm of Water in 20,000 Liters of Turbine Oil Really Mean? In lubrication engineering, water contamination is typically reported in ppm (parts per million). While this number often appears small, it can be dangerously misleading if not translated into actual physical quantity and system behavior. Let’s convert 100 ppm into reality—and more importantly, into risk. StepContinueContinue reading “What Does 100 ppm of Water in 20,000 Liters of Turbine Oil Really Mean?”

Fleet Turbine Oil Criticality Analysis and RUL Estimation 1. Purpose The goal is not only to say: “This oil is bad.” The real goal is to answer: Which turbine oil system must receive action first, why, what action, and how long can it safely continue before forced oil replacement, varnish-related reliability risk, or equipment damageContinueContinue reading “Fleet Turbine Oil Criticality Analysis and RUL Estimation”

⚙️ 1. Baseline: What a Pure Turbine Oil Is (Without EP) A classical turbine oil is fundamentally an R&O (Rust & Oxidation inhibited) system: Highly refined base oil (Group I, II, or III) Additive package: Antioxidants (phenolic / aminic) Rust inhibitors Demulsifiers Anti-foam agents 👉 The design philosophy: Chemical stability > load carrying Low polarity system Minimal surfaceContinueContinue reading “⚙️Turbbomachinery with Gears – Turbine Oil With EP Additives – What is the difference in performance with normal Turbine Oils ?⚙️”

Turbomachinery Engineer Asked : We have speed factor in rolling bearings , what do we have for speed in journal bearings linked to oil lubrication ? Khash Replied: In rolling bearings, you’re used to the speed factor (n·dm) as a practical limit tied to heat generation and lubrication regime. For journal (hydrodynamic) bearings, the equivalent thinking is notContinueContinue reading “The Role of Rotational Speed in Hydrodynamic Lubrication: Interpreting Journal Bearing Performance via Sommerfeld and Hersey Parameters”

Aeroderivative Gas Turbines: Turbine Oil Selection and Lubrication Differences Versus Other Turbomachinery Aeroderivative gas turbines are industrial gas turbines developed from aircraft engine technology. They are compact, lightweight, high-power-density machines with very fast start-up capability. They are widely used in power generation, offshore platforms, LNG, pipeline compression, emergency power, mechanical drive applications, and peaking powerContinueContinue reading “Aeroderivative Gas Turbines: Turbine Oil Selection and Lubrication Differences Versus Other Turbomachinery”

Air in turbine oil is not a single condition but a spectrum of physical states that behave differently inside a lubrication system. At one end, air exists as dissolved gas, fully in solution within the oil according to thermodynamic equilibrium (Henry’s Law). Under normal pressure and temperature, turbine oils can hold a significant amount of dissolvedContinueContinue reading “⚙️ Air in Turbine Oil — Forms, Testing, Root Causes, and Corrective Actions”