{"id":6564,"date":"2018-10-26T16:49:50","date_gmt":"2018-10-26T14:49:50","guid":{"rendered":"https:\/\/www.tempco.it\/blog\/?p=6564\/"},"modified":"2018-10-26T16:49:50","modified_gmt":"2018-10-26T14:49:50","slug":"function-and-capacity-of-expansion-vessels","status":"publish","type":"post","link":"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/","title":{"rendered":"Function and capacity of expansion vessels"},"content":{"rendered":"

Heat transfer fluids<\/strong><\/a> employed in thermal machines increase their volume while being heated. This effects in particular heat transfer oil<\/a> that have a high expansion coefficient, thus requiring to provide the plant with an expansion tank<\/strong><\/a>.<\/p>\n

\"vaso<\/a><\/p>\n

 <\/p>\n

The presence of an expansion tank allows not to exceed design pressure<\/strong> values on the system. In order to maintain the mechanical and chemical properties of the diathermic oil, some measures can be adopted to avoid the oxidation of the fluid<\/a> in contact with air in the tank. It can be achieved with a proper piping connection<\/strong> and leaving a minimum surface in contact with air<\/strong>, by using a vent. The air remaining inside the vessel generates a layer that gives up a limited oxygen quantity to the oil, becoming inactive.<\/p>\n

This is a simple and cost-effective solution compared to the cooling of the expansion tank, and by far less complicated than pressurizing the vessel with nitrogen.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Expansion tank capacity evaluation<\/strong><\/em>
\nThe capacity of expansion tank must be calculated based on two main factors:
\n– The high expansion coefficient of the thermal fluid
\n– The overall capacity of the system<\/p>\n

Considering a temperature of 300\u00b0 C, the capacity of the expansion tank must be approximately 30-50% of the overall volume of the cold transfer fluid<\/strong> employed to be heated. This evaluation allows a quiet fair margin of safety.<\/p>\n

The diameters used on the relief piping<\/strong> are also important, based on the plant potential, in order to avoid accidental over-pressure that can occur hampering the natural expansion flow of the oil.<\/p>\n

Here is a simple technical table with some recommendations:<\/p>\n

\"expansion<\/a><\/p>\n

Another important factor to be accounted is the pipe length changes<\/strong> due to thermal variations within the system, which will be properly treated in a future article.<\/p>\n","protected":false},"excerpt":{"rendered":"

How to calculate the capacity of an expansion tank in heat transfer oil systems, crucial to avoid the pressurization over pressure design values of the plant. <\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[66,87,710,76],"tags":[392,1480,1474,1475,161,1433,1476,137,651,445,1478,236,267,128,1479],"yoast_head":"\nFunction and capacity of expansion vessels - Tempco Blog<\/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:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Function and capacity of expansion vessels - Tempco Blog\" \/>\n<meta property=\"og:description\" content=\"How to calculate the capacity of an expansion tank in heat transfer oil systems, crucial to avoid the pressurization over pressure design values of the plant.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/\" \/>\n<meta property=\"og:site_name\" content=\"Tempco Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/tempco.srl\" \/>\n<meta property=\"article:published_time\" content=\"2018-10-26T14:49:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico-1024x764.jpg\" \/>\n<meta name=\"author\" content=\"Marco Zambelli\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Tempco_it\" \/>\n<meta name=\"twitter:site\" content=\"@Tempco_it\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marco Zambelli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/\"},\"author\":{\"name\":\"Marco Zambelli\",\"@id\":\"https:\/\/www.tempco.it\/blog\/#\/schema\/person\/888443da8bdce0582bcb917053553fec\"},\"headline\":\"Function and capacity of expansion vessels\",\"datePublished\":\"2018-10-26T14:49:50+00:00\",\"dateModified\":\"2018-10-26T14:49:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/\"},\"wordCount\":301,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.tempco.it\/blog\/#organization\"},\"keywords\":[\"diathermic oil\",\"expansion coefficient\",\"expansion tank\",\"expansion vessel\",\"heat transfer\",\"heat transfer fluids\",\"heat transfer oil\",\"heating\",\"oxidation\",\"piping\",\"relief\",\"temperature\",\"thermoregulating unit\",\"thermoregulation\",\"vent\"],\"articleSection\":[\"Heating\",\"Maintenance\",\"temperature control unit\",\"Thermoregulation Unit\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/\",\"url\":\"https:\/\/www.tempco.it\/blog\/en\/6564\/function-and-capacity-of-expansion-vessels\/\",\"name\":\"Function and capacity of expansion vessels - 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