{"id":39039,"date":"2021-02-05T19:34:22","date_gmt":"2021-02-05T19:34:22","guid":{"rendered":"https:\/\/testoil.mysites.io\/?p=12624"},"modified":"2023-05-02T18:48:42","modified_gmt":"2023-05-02T18:48:42","slug":"what-does-an-acid-number-measure","status":"publish","type":"post","link":"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/","title":{"rendered":"What does AN\/Acid Number Measure?"},"content":{"rendered":"\n<p>Are you 100% sure you know what AN (acid number) measures and what it reveals? Actually A LOT of things! According to Monika Malcolm, Analytical Services Manager for TestOil, \u201cAcid number is measuring acidic components in the oil sample. These can include degradation products such as organic acids, esters, and salts as well as contaminants such as inorganic acids, and certain additives such as detergents and inhibitors. \u201c&nbsp;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; So, on one level AN just measures acid\u2014more importantly,&nbsp; AN will let you know if you need to take a harder look at what may be causing the acid\u2014serious issues can stem from antioxidant depletion. When antioxidants have been consumed, oxidation of the lubricant will ensue, producing acidic compounds and increasing the acid number.<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; There is a misconception that AN just detects the lubricant\u2019s level of acidity, but it goes beyond that to detecting the concentration of specific acids present in the lubricant-both weak organic acids and strong inorganic acids. Pinpointing the concentration of acidic contaminants allows for understanding the extent of additive depletion, a change in oil type, or degradation.<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The acidic byproducts formed due to oxidation can lead to machine damage stemming from corrosive wear. Monika cautions, \u201cAcidic conditions can result in corrosion of machine components. High acid number due to lubricant degradation products can also promote accelerated lubricant degradation and may contribute to formation of sludge or varnish.\u201d<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Monitoring the AN and taking action can head all this off.<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AN measurement involves diluting a portion of the sample and then titrating it with a basic solution to a specific endpoint (ASTM method-D974). The result expresses how much titrant is needed to neutralize the acids in the sample aliquot.<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; All industrial lubricating oils and some combustion engine oils are excellent candidates for AN. However, this test is not appropriate for high water content fluids such as water glycols and oil\/water emulsions. Monitoring other parameters such as viscosity and FTIR oxidation along with acid number can provide a more complete picture of the lubricant condition. \u201c<a href=\"https:\/\/forms.testoil.com\/acton\/media\/4748\/get-the-picture?leadsource=blog\">Get the Picture<\/a>\u201d is an eBook focusing on understanding what your lubricant analysis reports are really saying and covers results analysis for acid number and a variety of other tests.<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; For more information on working with TestOil for oil analysis and training visit <a href=\"https:\/\/testoil.com\">www.testoil.com<\/a>. Contact: 216-251-2510; <a href=\"mailto:sales@testoil.com\">sales@testoil.com<\/a>.<\/p>\n\n\n\n<p><strong>About TestOil<\/strong><\/p>\n\n\n\n<p>With more than 30 years of experience in the oil analysis industry, TestOil focuses exclusively on assisting industrial facilities with reducing maintenance costs and avoiding unexpected downtime through oil analysis program implementation. As industry experts in diagnosing oil-related issues in equipment such as turbines, hydraulics, gearboxes, pumps, compressors and diesel generators, TestOil provides customers with a guarantee of same-day turnaround on all routine testing. With in-house, certified training professionals, TestOil offers lubrication and oil analysis training, private onsite training, certification training and exams, and educational webinars. For more information on partnering with TestOil on oil analysis programs or training opportunities visit <a href=\"https:\/\/testoil.com\">www.testoil.com<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"Are you 100% sure you know what AN (acid number) measures and what it reveals? Actually A LOT of things! According to Monika Malcolm, Analytical Services Manager for TestOil, \u201cAcid number is measuring acidic components in the oil sample. These can include degradation products such as organic acids, esters, and salts as well as contaminants such as inorganic acids, and&nbsp;<a href=\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\" class=\"read-more\">Continue Reading<\/a>","protected":false},"author":4012,"featured_media":12625,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[401,404],"tags":[3500],"class_list":["post-39039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-routine-testing","category-did-you-know","tag-what-does-acid-number-measure","cat-401-id","cat-404-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.0 (Yoast SEO v24.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What does AN\/Acid Number Measure? - TestOil<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What does AN\/Acid Number Measure?\" \/>\n<meta property=\"og:description\" content=\"Are you 100% sure you know what AN (acid number) measures and what it reveals? Actually A LOT of things! According to Monika Malcolm, Analytical Services Manager for TestOil, \u201cAcid number is measuring acidic components in the oil sample. These can include degradation products such as organic acids, esters, and salts as well as contaminants such as inorganic acids, and&nbsp;Continue Reading\" \/>\n<meta property=\"og:url\" content=\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\" \/>\n<meta property=\"og:site_name\" content=\"TestOil\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/TESTOILanalysis\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-05T19:34:22+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-02T18:48:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/testoil.com\/wp-content\/uploads\/2021\/02\/Acid-Number.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1800\" \/>\n\t<meta property=\"og:image:height\" content=\"1350\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Mary Messuti\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@TESTOILAnalysis\" \/>\n<meta name=\"twitter:site\" content=\"@TESTOILAnalysis\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mary Messuti\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\"},\"author\":{\"name\":\"Mary Messuti\",\"@id\":\"https:\/\/testoil.com\/#\/schema\/person\/634f56adbdecfee75bde9ce908569a0d\"},\"headline\":\"What does AN\/Acid Number Measure?\",\"datePublished\":\"2021-02-05T19:34:22+00:00\",\"dateModified\":\"2023-05-02T18:48:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\"},\"wordCount\":606,\"publisher\":{\"@id\":\"https:\/\/testoil.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/testoil.com\/wp-content\/uploads\/2021\/02\/Acid-Number.jpg\",\"keywords\":[\"What does acid number measure?\"],\"articleSection\":[\"Routine Testing\",\"Did You Know?\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\",\"url\":\"https:\/\/testoil.com\/routine-testing\/what-does-an-acid-number-measure\/\",\"name\":\"What does AN\/Acid Number Measure? 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