{"id":8462,"date":"2022-02-18T15:21:48","date_gmt":"2022-02-18T14:21:48","guid":{"rendered":"https:\/\/www.tempco.it\/blog\/?p=8462"},"modified":"2022-02-18T15:23:59","modified_gmt":"2022-02-18T14:23:59","slug":"double-wall-exchangers-and-oil-hydraulics","status":"publish","type":"post","link":"https:\/\/www.tempco.it\/blog\/en\/8462\/double-wall-exchangers-and-oil-hydraulics\/","title":{"rendered":"Double wall exchangers and oil hydraulics"},"content":{"rendered":"<p><a href=\"https:\/\/www.tempco.it\/blog\/en\/7863\/characteristics-and-applications-of-double-wall-heat-exchangers\/\" target=\"_blank\" rel=\"noopener\"><strong>Double wall heat exchangers<\/strong><\/a> are a particular kind of exchangers that is also employed in <a href=\"https:\/\/www.tempco.it\/blog\/en\/8426\/plate-heat-exchangers-and-hydraulics\/\" target=\"_blank\" rel=\"noopener\"><strong>oil hydraulics applications<\/strong><\/a>. The main characteristic of these exchangers is to have a double plate, or double wall, to avoid the possibility of <strong>mixing between primary and secondary fluid<\/strong> in case of breaking, <a href=\"https:\/\/www.tempco.it\/blog\/en\/5122\/metal-corrosion-in-thermal-machines-2\/\" target=\"_blank\" rel=\"noopener\">corrosion or perforation of the plates<\/a>.<\/p>\n<p>This kind of exchangers is employed in hydraulics plants especially in case of <strong>extremely sensitive applications<\/strong>. An example is the <strong>cooling of the hydraulic oil of a gearbox in a turbine<\/strong> for power generation, where the mechanical component is a core part of the application. In this case, having the presence of water within the oil leads to irreparable damages.<\/p>\n<p>The most common solution employs tube-in-tube <a href=\"https:\/\/en.tempco.it\/solutions-en\/heat-exchangers\/shell-and-tube-heat-exchangers\/\" target=\"_blank\" rel=\"noopener\"><strong>shell and plate exchangers<\/strong><\/a>, double tube then, or double wall. These exchangers have special heads that, in case of leakage of fluids, allow the <strong>leakage to flow within a special chamber<\/strong> between the two heads. Allowing the detection of the leakage and a prompt repair intervention.<\/p>\n<p>In case of double wall <a href=\"https:\/\/www.tempco.it\/soluzioni\/scambiatori-di-calore\/ispezionabili\/\" target=\"_blank\" rel=\"noopener\"><strong>plate heat exchangers<\/strong><\/a>, the presence of a <strong>double gasket in the nozzle area<\/strong> avoid the possibility of fluid\u2019s mixing. In case of breaking of a gasket, indeed, along the external perimeter of the exchanger or in the nozzle section, the <strong>leakage flows towards the outside of the exchanger<\/strong>. In case of cracking of a plate, there is an air chamber passing between the two plates, with therefore a visible leakage of fluids toward the outside, making it easy to repair it.<\/p>\n<p><iframe loading=\"lazy\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/u1gZSS6aebY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p><strong>Advantages and disadvantages<\/strong> of the double wall solution. The <strong>advantages are all related to the security<\/strong>, making double wall exchangers a mandatory choice when is strictly necessary to avoid any possible mixing between the primary and secondary fluid, in this case <strong>hydraulic oil and water<\/strong>. The disadvantages are many, on the other side, <strong>first of all the higher costs<\/strong> due to the fact that the number of plates gets duplicated. Thus increasing the amount and costs of construction materials. In addition, having a higher thickness and an internal chamber air between the two plates, the <strong>thermal transfer coefficient rates are lowered<\/strong>. And so, not only a higher amount of construction materials is needed, but also the thermal transfer surface must be increased, in order to achieve the same thermal duty. Anyway, it remains a necessary solution to prevent any possible problem of fluid\u2019s mixing, <strong>protecting the oil hydraulic plant<\/strong> from serious issues.<\/p>\n<p>Stay updated on the latest applications and subscribe here to our monthly <strong><a href=\"https:\/\/en.tempco.it\/newsletter-solid-temperature\/\" target=\"_blank\" rel=\"noopener\">Tempco Newsletter &#8211; Solid Temperature<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Double wall exchangers, both tube in tube shell and tube and plate exchangers, provide maximum security in oil hydraulic applications avoiding any possible mixing of primary and secondary fluid. <\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[64,469,63,473],"tags":[127,254,2595,3178,3172,487,3174,138,1874,484,2785,3171,1466,123,1179,3176,3175,3177,1627,1543,1334,2605,3173,427],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.5 - 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