{"id":44613,"date":"2026-02-20T10:41:10","date_gmt":"2026-02-20T09:41:10","guid":{"rendered":"https:\/\/ecol.eu\/en\/knowledge-base\/"},"modified":"2026-02-24T07:47:23","modified_gmt":"2026-02-24T06:47:23","slug":"deposits-and-varnish-in-industrial-systems","status":"publish","type":"post","link":"https:\/\/ecol.eu\/en\/knowledge-base\/deposits-and-varnish-in-industrial-systems","title":{"rendered":"Deposits and varnish in industrial systems: causes, diagnostics, and prevention methods"},"content":{"rendered":"<header class=\"page-hero alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"col-lg-7 offset-lg-1 page-hero__text\">\n\n        <nav aria-label=\"Okruszki\" role=\"navigation\">\n  <ul class=\"breadcrumbs\" aria-label=\"lista okruszk\u00f3w\">\n\n    \n      <li class=\"breadcrumbs__item\">\n\n                  <a href=\"https:\/\/ecol.eu\/en\/\" class=\"breadcrumbs__link\">Home page<\/a>\n        \n      <\/li>\n\n    \n  <\/ul>\n<\/nav>\n\n        <h1 class=\"heading heading--sb\">Deposits and varnish in industrial systems: causes, diagnostics, and prevention methods<\/h1>\n\n        \n      <\/div>\n\n      <ul class=\"col-lg-7 offset-lg-1 links\" data-links><\/ul>\n\n    <\/div>\n\n    \n      <svg class=\"page-hero__bg page-hero__bg--diagnostics\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xml:space=\"preserve\" width=\"122.057mm\" height=\"171.64mm\" version=\"1.1\" style=\"shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd\"\r\nviewBox=\"0 0 13001.94 18283.7\"\r\n xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\">\r\n <defs>\r\n  <style type=\"text\/css\">\r\n    .str1 {stroke:#1D1D1B;stroke-width:11.27;stroke-miterlimit:22.9256}\r\n    .str0 {stroke:#1D1D1B;stroke-width:22.55;stroke-miterlimit:22.9256}\r\n    .str5 {stroke:#1D1D1B;stroke-width:21.3;stroke-miterlimit:22.9256}\r\n    .str2 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d=\"M11559.44 13383.22c-0.8,-130.44 3.49,-256.42 0.14,-384.6 43.1,53.59 87.02,108.21 131.24,163.32 0.47,19.26 1.99,39.22 2.56,58.17 -41.11,56.81 -90.65,107.66 -133.93,163.11z\"\/>\r\n <\/g>\r\n<\/svg>\n\n    \n  <\/div>\n<\/header>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">deposits in oil systems: mechanisms and consequences<\/h2>\n<p class=\"post__paragraph\">Modern oil systems, due to their miniaturization, broad environmental requirements, and high operating loads, promote the intensive degradation of lubricants. One of the most problematic effects of this process is the formation of insoluble deposits. Submicron particles may form as a\u00a0result of local overheating, microdieseling, electrostatic discharges, or the depletion of additive packages. Additionally, deposit formation can also result from improper oil blending processes or mixing incompatible oils. <\/p>\n<p class=\"post__paragraph\">Initially, these contaminants reduce machine and equipment efficiency in a\u00a0way that is not easily noticeable, and in extreme cases they can lead to costly failures and downtime. dieseling, electrostatic discharges, or the depletion of additive packages. Additionally, deposit formation can also result from improper oil blending processes or mixing incompatible oils. Initially, these contaminants reduce machine and equipment efficiency in a\u00a0way that is not easily noticeable, and in extreme cases they can lead to costly failures and downtime.<\/p>\n<p class=\"post__paragraph\">Understanding the mechanism of varnish formation is crucial for effective maintenance operations. Early detection of symptoms allows for preventive and corrective actions to be taken, reducing the risk of equipment damage.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"495\" height=\"219\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-4.png\" alt=\"\" class=\"wp-image-44534\" style=\"width:540px;height:auto\" srcset=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-4.png 495w, https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-4-300x133.png 300w\" sizes=\"auto, (max-width: 495px) 100vw, 495px\" \/><figcaption class=\"wp-element-caption\">Rys.1 Varnish on valves [1] \/ source: machinerylubrication.com<\/figcaption><\/figure>\n<\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"756\" height=\"176\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/osady-i-laki-w-ukladach-przemyslowych.png\" alt=\"\" class=\"wp-image-44542\" srcset=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/osady-i-laki-w-ukladach-przemyslowych.png 756w, https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/osady-i-laki-w-ukladach-przemyslowych-300x70.png 300w\" sizes=\"auto, (max-width: 756px) 100vw, 756px\" \/><figcaption class=\"wp-element-caption\">Rys. 2 Deposit accumulated on filter elements<\/figcaption><\/figure>\n<\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h3 class=\"post__header heading heading--line\">phenomena influencing to deposit formation:<\/h3>\n<p class=\"post__paragraph\"><b>Oil oxidation<\/b> \u2013 This is the primary degradation process of a\u00a0lubricant, observed through an increase in acid number, a\u00a0change in oil color, increased viscosity, and the presence of degradation products in the FTIR (Fourier Transform Infrared Spectroscopy) spectrum. It occurs when oil components react with a\u00a0catalyst, forming reactive free radicals whose concentration continues to rise as subsequent reactions take place. This process will continue until the free radicals are neutralized by antioxidants, which convert them into inert by-products. It is important to note the commonly accepted principle, that every 10 \u00b0C increase in temperature, significantly accelerates oxidation (especially in the presence of catalysts such as metals, oxygen, or elevated pressure), which approximately halves the service life of the lubricant (Arrhenius rule).<\/p>\n<p class=\"post__paragraph\"><b>Polymerization<\/b> \u2013 the combination of carboxylic acids and hydroperoxides (ROOH \u2013 initiators of radical reactions) into larger particles. This leads to the formation of large, low\u2011molecular\u2011mass particles. Each increase in the degree of oil polymerization results in a\u00a0rise in viscosity.<\/p>\n<p class=\"post__paragraph\"><b>Thermal and pressure\u2011induced degradation of the base oil<\/b> \u2013 Oxygenation of the oil combined with adiabatic compression can cause the implosion of air bubbles within the lubricant, known as microdieseling. Consequently, this phenomenon generates localized hotspots in the oil, leading to thermal degradation of the lubricant.<\/p>\n<p class=\"post__paragraph\"><b>Degradation of the base oil caused by electrostatic discharges<\/b> \u2013 Molecular friction between the oil and components of the lubrication system generates a\u00a0potential difference. In the reservoirs, this can lead to electrostatic discharges, creating localized hotspots.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h3 class=\"post__header heading heading--line\">process of varnish formation:<\/h3>\n<p><b>Low\u2011temperature deposits (cold varnish)<\/b><br>\nAs a\u00a0result of lubricant oxidation, polar particles are formed, which initiate the varnish\u2011forming process. When these polar degradation products exceed the saturation point of the solution, they agglomerate on metallic surfaces within the system, creating deposits. Due to the thermal characteristics of this mechanism, varnish typically forms in the cooler zones of the system (e.g., coolers, valves, filters).<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-eng.svg\" alt=\"\" class=\"wp-image-44625\"\/><figcaption class=\"wp-element-caption\">Figure 3. Scheme of the deposits formation process<\/figcaption><\/figure>\n<\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <p class=\"post__paragraph\">The process of deposit formation is reversible, which means that by altering the temperature, it is possible to influence the position of the saturation point. Monitoring the number of insoluble deposits can provide information about the level of contamination accumulated on system surfaces. Observing the varnish content can help determine the degree of oil saturation with sub-micron deposits, estimating the risk of contamination of component surfaces located at the deeper parts of the system, due to a\u00a0sudden drop in temperature.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <p><b>high\u2011temperature deposits (hot varnish)<\/b><br>\nOil degradation occurs locally, in areas where the highest shear stresses impact on the lubricant. The generated thermal energy causes a\u00a0local temperature spike, leading to the formation of deposits. This phenomenon most commonly occurs in high\u2011speed machinery, where heavy loads reduce the thickness of the lubricant film. It may also appear after repairs or system reconfigurations.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"477\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-1.png\" alt=\"\" class=\"wp-image-44559\" style=\"width:571px;height:auto\" srcset=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-1.png 721w, https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-1-300x198.png 300w\" sizes=\"auto, (max-width: 721px) 100vw, 721px\" \/><figcaption class=\"wp-element-caption\">Figure 4. Deposits on the bearing surface [2] \/ source: testoil.com<\/figcaption><\/figure>\n<\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h3 class=\"post__header heading heading--line\">measurement parameters that may indicate the risk of deposit formation in the system:<\/h3>\n<p class=\"post__paragraph\"><strong>MPC (Membrane Patch Colorimetry)<\/strong> \u2013\u00a0a\u00a0test used to determine the tendency of an oil to form insoluble deposits by using a\u00a0non\u2011polar solvent and a\u00a0spectrophotometer. The analysis involves heating up the sample at 60 \u00b0C (for 24 hours) and then keeping it for 72 hours at 20 \u00b0C. Afterwards, the oil is passed through a\u00a0membrane filter (0.45 \u03bcm). The filter is then analysed using a\u00a0colorimeter. The result (\u0394E) includes the following components:<\/p>\n<ul class=\"post__list post__list--nonordered\">\n<li class=\"post__list-item\"><strong>Luminance \u2013 L<\/strong> \u2013 the highest the proportion of dark particles, the lower the L value.<\/li>\n<li class=\"post__list-item\"><strong>Red value \u2013\u00a0a\u00a0<\/strong> \u2013 higher values indicate a\u00a0greater presence of corrosive particles.<\/li>\n<li class=\"post__list-item\"><strong>Yellow value \u2013 b<\/strong> \u2013 higher values indicate a\u00a0greater tendency to form sticky deposits.<\/li>\n<\/ul>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/tabela1_eng.svg\" alt=\"\" class=\"wp-image-44620\"\/><figcaption class=\"wp-element-caption\">Table 1. Interpretation of the MPC result (\u0394E)<\/figcaption><\/figure>\n<\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"941\" height=\"294\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-3.png\" alt=\"\" class=\"wp-image-44571\" srcset=\"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-3.png 941w, https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-3-300x94.png 300w, https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-3-768x240.png 768w\" sizes=\"auto, (max-width: 941px) 100vw, 941px\" \/><figcaption class=\"wp-element-caption\">Figure 5. Examples of MPC membranes<\/figcaption><\/figure>\n<\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <p class=\"post__paragraph\"><b>RULER (voltammmetry)<\/b> \u2013 A linear increase in voltage decomposes specific antioxidants (amine- or phenol\u2011based) at a\u00a0defined current, generating a\u00a0characteristic peak on the graph. By comparing the resulting curve with a\u00a0reference, it is possible to determine the remaining amount of antioxidant additives. Critically low antioxidant content increases the tendency of the lubricant to oxidize, which in turn leads to deposit formation on system surfaces.<\/p>\n<p class=\"post__paragraph\"><b>Acid Number<\/b> \u2013 Oxidation products formed in the oil exhibit an acidic character, which allows the degree of lubricant aging and its remaining service life to be assessed. The acid number is measured by titrating the amount of potassium hydroxide (KOH) required to neutralize all acidic degradation products present in 1 gram of the sample.<\/p>\n<p class=\"post__paragraph\"><b>Oxidation Stability<\/b> (Rotating Pressure Vessel Oxidation Test \u2013 RPVOT) \u2013 The test subjects the lubricant to high temperature (150 \u00b0C), the presence of water, pressurized oxygen, and copper acting as a\u00a0catalyst. Oxidation stability is determined by measuring the time required for the pressure to drop (1.75 bar) relative to the highest pressure recorded during the test. Reduced oxidation stability promotes chemical transformations of the oil, thereby increasing deposit formation on system components.<\/p>\n<p class=\"post__paragraph\"><b>Contamination particles count according to ISO 4406<\/b> \u2013 High levels of contamination in the oil often lead to the formation of agglomerates in the form of deposits. Their polarity may react with water, air, and other compounds to form hard\u2011to\u2011dissolve sludge and varnish.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h3 class=\"post__header heading heading--line\">effects of Varnish Formation<\/h3>\n<ul class=\"post__list post__list--nonordered\">\n<li class=\"post__list-item\">Reducing heat transfer between system components, increasing system temperature<\/li>\n<li class=\"post__list-item\">Agglomeration of contaminants, clogging filters<\/li>\n<li class=\"post__list-item\">Accelerated oil degradation<\/li>\n<li class=\"post__list-item\">Reducing the clearances and fits required by the manufacturer<\/li>\n<li class=\"post__list-item\">Leading to improper valve control and jamming of control systems<\/li>\n<\/ul>\n<h2 class=\"post__header heading heading--line\">how to Reduce the Tendency for Deposit Formation (Lower the MPC Value)<\/h2>\n<ul class=\"post__list post__list--nonordered\">\n<li class=\"post__list-item\"><strong>Use high-quality lubricants<\/strong><\/li>\n<li class=\"post__list-item\"><strong>Regularly replenish or refresh the oil<\/strong><\/li>\n<li class=\"post__list-item\"><strong>Use additives that help dissolve deposits<\/strong><\/li>\n<li class=\"post__list-item\"><strong>Nanofiltration<\/strong> \u2013 A filtration method in which oil is forced under pressure through membranes with very small, defined pore sizes that retain larger particles and contaminants.<\/li>\n<li class=\"post__list-item\"><strong>Agglomeration filters<\/strong> \u2013 Effective at capturing submicron contaminants. The medium is separated into two streams that impart opposite charges to deposit particles. When mixed again, the particles agglomerate into larger contaminants, allowing conventional mechanical filtration to continue.<\/li>\n<li class=\"post__list-item\"><strong>Electrostatic filters<\/strong> \u2013 Capture both soluble and insoluble deposits by utilizing the polar attraction between the filter and varnish particles.<\/li>\n<li class=\"post__list-item\"><strong>Ion-exchange filters<\/strong> \u2013 Remove deposits through ionic bonding between polar contamination particles and resin materials of the filter elements, which have a\u00a0highly structured, absorbent surface.<\/li>\n<\/ul>\n<h3 class=\"post__header heading heading--line\">when Contamination Is Advanced<\/h3>\n<p class=\"post__paragraph\">In cases where insufficient monitoring of the oil\u2019s physicochemical parameters has led to severe contamination and oil replacement is required, mechanical methods should be applied:<\/p>\n<ul class=\"post__list post__list--nonordered\">\n<li class=\"post__list-item\"><strong>Hydrodynamic cleaning (hydroblasting)<\/strong> \u2013 A method of cleaning the internals of the system without the use of cleaning agents. It uses water at very high pressure (up to 3,000 bar) to effectively remove deposits, sludge and corrosion products while minimizing the risk of damage to cleaned components.<\/li>\n<\/ul>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">summary<\/h2>\n<p class=\"post__paragraph\">The formation of varnish and deposits is a\u00a0natural effect of oil degradation resulting from oxidation processes, thermal loads and operating conditions. These contaminants can significantly reduce machine efficiency, accelerate lubricant ageing and lead to failure. Regular monitoring of the oil\u2019s physicochemical parameters and the use of appropriate filtration and purification methods can reduce the risk of their formation and keep the system in a\u00a0safe operating condition.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n        <div class=\"container\">\n            <div class=\"row\">\n                <div class=\"offset-lg-1 offset-md-0 col-lg-11\">\n                    \n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n                <\/div>\n            <\/div>\n        <\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <div style=\"border: 1px solid #d9e2ec; background-color: #f7fafc; padding: 20px; border-left: 5px solid #2b6cb0; border-radius: 4px; margin: 20px 0;\">\n<h2 style=\"margin-top: 0;\">Key Takeaways<\/h2>\n<ul style=\"margin-bottom: 0;\">\n<li class=\"post__list-item\">\u2192 Varnish and deposits are formed mainly as a\u00a0result of oil oxidation and local overheating.<\/li>\n<li class=\"post__list-item\">\u2192 In most cases, the deposit formation process is reversible and depends, among other factors, on temperature and the level of oil saturation with degradation products.<\/li>\n<li class=\"post__list-item\">\u2192 Key risk indicators include MPC, antioxidant level (RULER), acid number and oxidation stability.<\/li>\n<li class=\"post__list-item\">\u2192 Even small amounts of deposits can cause problems with cooling, filtration and the operation of control components.<\/li>\n<li class=\"post__list-item\">\u2192 Prevention (oil condition monitoring, proper filtration and system cleanliness) is significantly more cost-effective than removing the effects of contamination.<\/li>\n<\/ul>\n<\/div>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n        <div class=\"container\">\n            <div class=\"row\">\n                <div class=\"offset-lg-1 offset-md-0 col-lg-11\">\n                    \n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n                <\/div>\n            <\/div>\n        <\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">bibliography<\/h2>\n<ol class=\"post__list post__list--ordered\">\n<li class=\"post__list-item\">1. Michael Barrett, Insight Services; \u201eVarnish Potential Analysis\u201d.<\/li>\n<li class=\"post__list-item\">2. Hasanur J. Molla et al., Saudi Aramco; \u201eResolving Varnish Challenges Using Soluble Varnish Removal Technology\u201d.<\/li>\n<li class=\"post__list-item\">3. Dave Wooton, Wooton Consulting; Greg Livingstone, Fluitec International; \u201eComplete Guide to Lubricant Deposit Characterization\u201d.<\/li>\n<li class=\"post__list-item\">4. Noria Corporation; \u201eThe Lowdown on Oil Breakdown\u201d.<\/li>\n<li class=\"post__list-item\">5. Jim Fitch, Noria Corporation; \u201eThe Power of the Patch: Comparing Particle Analysis Methods Using Membranes\u201d.<\/li>\n<li class=\"post__list-item\">6. Jim Fitch, Noria Corporation; \u201eSludge and Varnish in Turbine Systems\u201d.<\/li>\n<li class=\"post__list-item\">7. Wasan Chokelarb, Pornsawan Assawasaengrat, Andy Sitton, Thanant Sirisithichote, Pongsert Sriprom; \u201eSoluble and Insoluble Varnish Test Methods for Trending Varnish Buildup in Mineral Turbine Oil\u201d.<\/li>\n<li class=\"post__list-item\">8. Ghasem Shilati, Naham Pala Engineering; \u201eDeficiencies of Membrane Patch Colorimetry (MPC) Test: The Varnish Potential Test\u201d.<\/li>\n<li class=\"post__list-item\">9. Bennett Fitch, Noria Corporation; \u201eIdentifying the Stages of Oil Oxidation\u201d.<\/li>\n<li class=\"post__list-item\">10. Greg Livingstone; \u201eVarnish Deposits in Bearings: Causes, Consequences, and Cures\u201d.<\/li>\n<li class=\"post__list-item\">11. Justin Stover, C.C. Jensen; \u201eAdsorption: A Simple and Cost-Effective Solution to Remove Varnish\u201d.<\/li>\n<li class=\"post__list-item\">12. Greg Livingstone; \u201eVarnish Deposits in Bearings: Causes, Consequences, and Cures\u201d.<\/li>\n<li class=\"post__list-item\">13. Nguyen Truong, Noria Corporation; \u201eToday\u2019s Varnish Control Technologies\u201d.<\/li>\n<li class=\"post__list-item\">14. Sung-Ho Hong, Eun Kyung Jang; \u201eVarnish Formation and Removal in Lubrication Systems: A Review\u201d.<\/li>\n<\/ol>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"Mechanisms of varnish and sludge formation in oil systems, key diagnostic parameters and effective methods of reducing their formation.","protected":false},"author":3,"featured_media":44561,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[61],"tags":[],"class_list":["post-44613","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-services"],"acf":[],"image":"https:\/\/ecol.eu\/wp-content\/uploads\/2026\/02\/Osady-i-laki-w-ukladach-przemyslowych-1.png","_links":{"self":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts\/44613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/comments?post=44613"}],"version-history":[{"count":6,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts\/44613\/revisions"}],"predecessor-version":[{"id":44680,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts\/44613\/revisions\/44680"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/media\/44561"}],"wp:attachment":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/media?parent=44613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/categories?post=44613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/tags?post=44613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}