{"id":11739,"date":"2018-05-01T10:21:34","date_gmt":"2018-05-01T15:21:34","guid":{"rendered":"http:\/\/polarislabs.com\/?p=11739"},"modified":"2025-08-18T10:52:01","modified_gmt":"2025-08-18T14:52:01","slug":"effects-of-varnish","status":"publish","type":"post","link":"https:\/\/polarislabs.com\/es\/effects-of-varnish\/","title":{"rendered":"Del experto: Efectos del barniz"},"content":{"rendered":"<p><a href=\"\/wp-content\/uploads\/2018\/04\/VarnishTesting.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-11748\" src=\"\/wp-content\/uploads\/2018\/04\/VarnishTesting.jpg\" alt=\"\" width=\"1100\" height=\"400\" srcset=\"https:\/\/polarislabs.com\/wp-content\/uploads\/2018\/04\/VarnishTesting.jpg 1100w, https:\/\/polarislabs.com\/wp-content\/uploads\/2018\/04\/VarnishTesting-300x109.jpg 300w, https:\/\/polarislabs.com\/wp-content\/uploads\/2018\/04\/VarnishTesting-768x279.jpg 768w, https:\/\/polarislabs.com\/wp-content\/uploads\/2018\/04\/VarnishTesting-1030x375.jpg 1030w, https:\/\/polarislabs.com\/wp-content\/uploads\/2018\/04\/VarnishTesting-705x256.jpg 705w, https:\/\/polarislabs.com\/wp-content\/uploads\/2018\/04\/VarnishTesting-450x164.jpg 450w\" sizes=\"auto, (max-width: 1100px) 100vw, 1100px\" \/><\/a>El barniz es una sustancia gelatinosa que se adhiere a las superficies met\u00e1licas y puede provocar puntos calientes, aumentar la temperatura de la m\u00e1quina y obstruir los filtros, producir microdiesel y causar aver\u00edas catastr\u00f3ficas. Es importante comprobar si hay barniz en <a href=\"http:\/\/polarislabs.com\/es\/testing\/equipment-type\/turbines\/\">turbinas<\/a>, <a href=\"http:\/\/polarislabs.com\/es\/testing\/equipment-type\/compressors\/\">compresores<\/a>, <a href=\"http:\/\/polarislabs.com\/es\/testing\/equipment-type\/hydraulics\/\">hidr\u00e1ulica<\/a> y grandes sistemas de circulaci\u00f3n y lubricaci\u00f3n. Hemos recurrido a nuestra experta, analista de datos certificada por CLS y OMA I, Elaine Hepley, para explorar el barniz y la prueba de colorimetr\u00eda de parche de membrana (MPC) realizada para detectarlo, as\u00ed como otras dos pruebas que pueden ayudar a identificar el potencial de formaci\u00f3n de barniz.<\/p>\n<ul>\n<li><strong>Colorimetr\u00eda de parche de membrana (MPC) ASTM D7843<\/strong>\n<ul>\n<li>El MPC es una prueba dise\u00f1ada para captar cualquier presencia de barniz soluble con el aceite. Esta prueba se realiza calentando la muestra a 60 o 65 grados Celsius durante 23 o 25 horas. A continuaci\u00f3n, la muestra se coloca en la oscuridad, lejos de la luz ultravioleta, durante 68 a 76 horas. Tras el per\u00edodo de incubaci\u00f3n, la muestra se mezcla con \u00e9ter de petr\u00f3leo y se agita durante 30 segundos para permitir una mezcla completa y, a continuaci\u00f3n, se filtra en un parche de membrana de 47 mm y 0,45 micras de tama\u00f1o.<\/li>\n<li>El parche se coloca en un lugar sin polvo ni calor y se seca al aire durante unas 3 horas. Una vez seco el parche, se utiliza un color\u00edmetro para detectar el color del parche y los c\u00e1lculos CIE Lab \u0394\u0395 y L*a*b* para informar del color del parche. La escala de color y gravedad es la siguiente:\n<ul>\n<li>0-14.99: Gravedad 0 - Potencial muy bajo de formaci\u00f3n de barniz.<\/li>\n<li>15-19.99: Gravedad 1 - Potencial menor de formaci\u00f3n de barniz.<\/li>\n<li>20-29.99: Gravedad 2 - Potencial moderado de formaci\u00f3n de barniz.<\/li>\n<li>30-39.99: Gravedad 3 - Potencial significativo de formaci\u00f3n de barniz. Deben tomarse medidas preventivas para detener la formaci\u00f3n continua de barniz.<\/li>\n<li>&gt;40: Gravedad 4 - Formaci\u00f3n grave y evidente de barniz en el sistema, y deben tomarse medidas para eliminar el barniz.<\/li>\n<\/ul>\n<\/li>\n<li>Cuanto m\u00e1s claro (m\u00e1s blanco) sea el color del parche, menor ser\u00e1 el valor MPC y cuanto m\u00e1s oscuro (\u00e1mbar) sea el color del parche, mayor ser\u00e1 el valor MPC.<\/li>\n<li><em>NOTA: La decoloraci\u00f3n gris del parche puede deberse a microdieseling o descarga est\u00e1tica en los filtros.<\/em><\/li>\n<li>Las pruebas MPC pueden realizarse en turbinas y otros tipos de unidades, como compresores, sistemas hidr\u00e1ulicos, grandes sistemas de circulaci\u00f3n y lubricaci\u00f3n.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Voltamperometr\u00eda de barrido lineal (LSV) ASTM D6971<\/strong>\n<ul>\n<li>La LSV utiliza una lectura de tensi\u00f3n para detectar la presencia de antioxidantes aminas y fenoles. La prueba se realiza utilizando una soluci\u00f3n a base de alcohol\/acetona (amarilla o verde) para ayudar a extraer los antioxidantes del aceite. Se introduce una corriente el\u00e9ctrica en la muestra y revela la presencia de aminas y fenoles en cuesti\u00f3n de segundos. Los resultados del aceite usado se comparan con un est\u00e1ndar (niveles de lubricante nuevo) y se notifican las diferencias\/cambios en los antioxidantes en porcentaje.<\/li>\n<li>Algunas formulaciones se componen de aminas, fenoles o ambos. Los fenoles se consideran el \"antioxidante de sacrificio\" cuando se formulan junto con aminas. La funci\u00f3n de los fenoles es ser los primeros en agotarse. Esto deja a las aminas para estabilizar y mantener a raya el potencial de barniz.<\/li>\n<li>Esto no quiere decir que los fenoles sean un antioxidante d\u00e9bil. En una formulaci\u00f3n con s\u00f3lo fenol, el fenol est\u00e1 formulado para mantener su presencia y no agotarse tan r\u00e1pidamente cuando se formula con una amina. La misma regla se aplicar\u00eda a una formulaci\u00f3n s\u00f3lo con aminas. Estos antioxidantes ayudan a evitar que los \u00f3xidos de radicales libres se apoderen del sistema y creen \"barniz\". Los antioxidantes ayudan a mantener una vida operativa saludable del equipo.<\/li>\n<li>Se ha descubierto que a medida que estos antioxidantes se agotan, el potencial de barniz es eminente y deben tomarse medidas para ayudar a eliminar el barniz del sistema por completo.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Prueba de oxidaci\u00f3n en recipiente a presi\u00f3n giratorio (RPVOT) ASTM D2272<\/strong>\n<ul>\n<li>El RPVOT se dise\u00f1\u00f3 para medir la estabilidad a la oxidaci\u00f3n del aceite de una turbina en cuesti\u00f3n de minutos. El lubricante se coloca en un recipiente que contiene una bobina de cobre pulido. El recipiente se carga con ox\u00edgeno y, a continuaci\u00f3n, se introduce en un ba\u00f1o calentado a una temperatura constante de 150 \u00b0C. El recipiente gira mientras est\u00e1 sumergido en el ba\u00f1o y se detiene cuando se alcanza una ca\u00edda de 25,4 psi desde la presi\u00f3n m\u00e1xima.<\/li>\n<li>Una vez finalizada la prueba, los resultados RPVOT se dividen por el valor inicial RPVOT del lubricante nuevo para calcular el porcentaje global de vida \u00fatil restante.<\/li>\n<li>C\u00e1lculo %=Resultado de la prueba RPVOT \u00f7 RPVOT lubricante nuevo\n<ul>\n<li>Los valores de &gt;55% est\u00e1n dentro de los l\u00edmites aceptables para el m\u00e9todo y no es necesario tomar ninguna medida.<\/li>\n<li>Los valores de 55-45% son aproximadamente la mitad de la vida \u00fatil inicial de los productos y se recomienda endulzarlos.<\/li>\n<li>Los valores de 44-26% indican una baja estabilidad oxidativa. Es probable que se formen lodos y se produzca decoloraci\u00f3n, por lo que se recomienda endulzar el sumidero.<\/li>\n<li>Los valores &lt;25% indican que la estabilidad oxidativa es extremadamente baja y es aconsejable cambiar el lubricante.<\/li>\n<\/ul>\n<\/li>\n<li>La prueba RPVOT es esencial para los aceites de turbina. Esta prueba ayuda a determinar cu\u00e1ndo programar las paradas y las acciones de mantenimiento.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Se cree que a medida que se agotan los antioxidantes, aumenta la posibilidad de formaci\u00f3n de barniz. Se recomiendan las pruebas de LSV Ruler para ayudar a controlar las propiedades antioxidantes, as\u00ed como la presencia de formaci\u00f3n de barniz mediante MPC. A medida que estos antioxidantes se agotan, la presencia de formaci\u00f3n de barniz puede captarse en el MPC. Estas dos pruebas pueden utilizarse para ayudar a correlacionar cualquier disminuci\u00f3n o aumento de antioxidantes y controlar cualquier cambio\/mejora con la presencia de barniz. La misma correlaci\u00f3n se puede utilizar con RPVOT como los valores disminuyen o son &lt;44% el potencial de formaci\u00f3n de barniz.<\/p>\n<p><a href=\"http:\/\/www2.eoilreports.com\/CompleteTestList\">Haga clic aqu\u00ed para ver una lista completa de los ensayos realizados por los Laboratorios POLARIS<sup>\u00ae<\/sup><\/a><\/p>\n<p><em>Impacto probado. Tiempo de actividad probado. Ahorro probado.<br \/>\n<\/em><strong>D\u00e9jenos demostr\u00e1rselo.<\/strong><\/p>\n<h6>Publicado el 1 de mayo de 2018<\/h6>","protected":false},"excerpt":{"rendered":"<p>Varnish is a gel-like substance that adheres to metal surfaces and can cause hot spots, increase in machine temperature and can result in filter plugging, micro-dieseling and can cause catastrophic [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":11782,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[7,187,3,1],"tags":[],"class_list":["post-11739","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-oil-testing","category-resources","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Varnish is a gel-like substance that adheres to metal surfaces and can cause hot spots, increase in machine temperature and can result in filter plugging, micro-dieseling and can cause catastrophic failure. 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