{"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":"<p><a href=\"https:\/\/www.tempco.it\/blog\/en\/6506\/treg-units-and-heat-transfer-fluids-advantages-and-critical-points\/\"><strong>Heat transfer fluids<\/strong><\/a> employed in thermal machines increase their volume while being heated. This effects in particular <a href=\"https:\/\/www.tempco.it\/blog\/en\/6172\/the-5-must-to-do-point-to-start-up-treg-hce-hcst-o-oh-diathermic-oil\/\">heat transfer oil<\/a> that have a high expansion coefficient, thus requiring to provide the plant with an <a href=\"https:\/\/www.tempco.it\/blog\/en\/6522\/how-to-correct-commissioning-of-thermoregulating-units\/\"><strong>expansion tank<\/strong><\/a>.<\/p>\n<p><a href=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-6558 alignleft\" src=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico-1024x764.jpg\" alt=\"vaso espansione olio diatermico\" width=\"507\" height=\"378\" srcset=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico-1024x764.jpg 1024w, https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico-300x224.jpg 300w, https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico-768x573.jpg 768w, https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-vaso-espansione-olio-diatermico.jpg 1303w\" sizes=\"auto, (max-width: 507px) 100vw, 507px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>The presence of an expansion tank allows <strong>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 <a href=\"https:\/\/www.tempco.it\/blog\/en\/5892\/diathermic-oil-life-span-in-thermoregulating-units\/\">oxidation of the fluid<\/a> in contact with air in the tank. It can be achieved with a <strong>proper piping connection<\/strong> and leaving a <strong>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<p>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>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Expansion tank capacity evaluation<\/strong><\/em><br \/>\nThe capacity of expansion tank must be calculated based on two main factors:<br \/>\n&#8211; The high expansion coefficient of the thermal fluid<br \/>\n&#8211; The overall capacity of the system<\/p>\n<p>Considering a temperature of 300\u00b0 C, the capacity of the expansion tank must be approximately <strong>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<p>The diameters used on the <strong>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<p>Here is a simple technical table with some recommendations:<\/p>\n<p><a href=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-expansion-tank-relief-pipe.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6565\" src=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-expansion-tank-relief-pipe-1024x679.jpg\" alt=\"expansion tank heat transfer oil\" width=\"430\" height=\"285\" srcset=\"https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-expansion-tank-relief-pipe-1024x679.jpg 1024w, https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-expansion-tank-relief-pipe-300x199.jpg 300w, https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-expansion-tank-relief-pipe-768x510.jpg 768w, https:\/\/www.tempco.it\/blog\/wp-content\/uploads\/2018\/10\/Tempco-expansion-tank-relief-pipe.jpg 1370w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\" \/><\/a><\/p>\n<p>Another important factor to be accounted is the <strong>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":"<p>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":{"footnotes":""},"categories":[66,87,710,76],"tags":[392,1480,1474,1475,161,1433,1476,137,651,445,1478,236,267,128,1479],"class_list":["post-6564","post","type-post","status-publish","format-standard","hentry","category-heating","category-maintenance","category-temperature-control-unit","category-thermoregulation-unit","tag-diathermic-oil","tag-expansion-coefficient","tag-expansion-tank","tag-expansion-vessel","tag-heat-transfer","tag-heat-transfer-fluids","tag-heat-transfer-oil","tag-heating-2","tag-oxidation","tag-piping","tag-relief","tag-temperature","tag-thermoregulating-unit","tag-thermoregulation","tag-vent"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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