{"id":19701,"date":"2025-06-23T15:42:54","date_gmt":"2025-06-23T13:42:54","guid":{"rendered":"https:\/\/www.lidering.com\/?p=19701"},"modified":"2025-06-23T15:53:35","modified_gmt":"2025-06-23T13:53:35","slug":"double-mechanical-seal-for-industrial-agitators-cartridge-ldc40","status":"publish","type":"post","link":"https:\/\/www.lidering.com\/en\/double-mechanical-seal-for-industrial-agitators-cartridge-ldc40\/","title":{"rendered":"Double mechanical seal for industrial agitators: cartridge LDC40"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In industrial agitator applications, one of the biggest sealing challenges is to ensure lubrication when the product does not come into contact with the mechanical seal.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">As we told you in the post on <a href=\"https:\/\/www.lidering.com\/en\/manufacture-of-high-performance-mechanical-seals-for-reactors\/\" target=\"_blank\" rel=\"noopener\">Manufacturing high performance mechanical seals for reactors<\/a>, this often occurs in reactors or vessels where the process fluid is in the lower part of the system.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In this dry working condition, it is essential to have a<a href=\"https:\/\/www.lidering.com\/en\/subsection\/double-cartridge\/\" target=\"_blank\" rel=\"noopener\"> double mechanical seal<\/a> to ensure reliable and durable operation.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">At Lidering, we have <a href=\"https:\/\/www.lidering.com\/en\/product\/ldc40\/\" target=\"_blank\" rel=\"noopener\">developed the LDC40 double cartridge mechanical seal<\/a>, a technical solution specifically designed for the demands of the MRO industry, capable of adapting to the most demanding speed, temperature and sealing conditions.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-19704\" src=\"https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior1.webp\" alt=\"LDC40 cartridge installed in pharmaceutical lab equipment\" width=\"1140\" height=\"450\" srcset=\"https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior1.webp 1140w, https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior1-300x118.webp 300w, https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior1-1024x404.webp 1024w, https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior1-768x303.webp 768w\" sizes=\"(max-width: 1140px) 100vw, 1140px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>Why choosing a double mechanical seal for agitators?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">In industrial agitators, simple sealing is often insufficient. The absence of lubricating fluid between the friction faces can lead to premature wear, seal failure and overheating. This is where the LDC40 cartridge, with its double mechanical seal design, makes the difference.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">This cartridge works with a secondary fluid (barrier fluid), i.e. a liquid that is introduced between the two seal faces and acts as a lubricating and cooling element.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">This technical solution allows:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Work with corrosive, abrasive products or products with risk of crystallisation.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To increase the service life of the sealing system.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dissipate heat generated by internal friction.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To ensure sealing even in processes with variable pressure or high rotations.<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>Double mechanical seal performance: reliability under extreme conditions<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The LDC40 has the ability to operate at elevated temperatures. It is enhanced by an integrated pumping system, which drives the barrier fluid through the internal chamber of the cartridge. This continuous flow ensures proper heat dissipation, keeping the seal environment stable even over extended production cycles.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>Barrier fluid supply for MRO agitators: open or closed<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The barrier fluid in the LDC40 cartridge can be supplied in two configurations:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">By open circuit, using mains water or other external source.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">By closed circuit, using a <a href=\"https:\/\/www.lidering.com\/en\/product\/lst9\/\" target=\"_blank\" rel=\"noopener\">pressurised tank such as the Lidering LST9<\/a>, designed to maintain the barrier fluid at optimum pressure and temperature.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">To ensure lubrication between faces, it is advisable that the barrier fluid has a pressure slightly higher than that inside the agitator, ideally between 1 and 2 bar above. This principle is in line with the API Plan 53A concept, which establishes a controlled barrier flow to prevent product from entering the seal chamber.<\/span><\/p>\n<h2><img decoding=\"async\" class=\"alignnone size-full wp-image-19709\" src=\"https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior2.webp\" alt=\"Technical diagram of LDC40 cartridge mechanical seal system\" width=\"1140\" height=\"220\" srcset=\"https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior2.webp 1140w, https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior2-300x58.webp 300w, https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior2-1024x198.webp 1024w, https:\/\/www.lidering.com\/wp-content\/uploads\/2025\/06\/Cartucho-LCD40-en-Agitadores-LID_2025-05_ENG_BLOG_interior2-768x148.webp 768w\" sizes=\"(max-width: 1140px) 100vw, 1140px\" \/><\/h2>\n<h2 style=\"text-align: justify;\"><b>Technical aspects of the double mechanical seal: purging and filling of the cartridge<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">One of the critical points in double seal systems is to ensure that no air pockets are left in the barrier fluid chamber. The LDC40 cartridge incorporates an integrated venting system that facilitates this operation easily and safely.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">A small hole in the flange of the cartridge gives access to a metal part which, when moved slightly downwards (approx. 1 mm), allows the air to escape and the chamber to be completely filled with barrier fluid. This operation is quick and effective, and guarantees the correct functioning of the cartridge from the moment it is put into operation.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Main features and benefits of the LDC40 cartridge<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Double mechanical seal with integrated barrier fluid.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Safe operation in dry working conditions.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High resistance to variable temperatures and pressures.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Linear operating speeds up to 16 m\/s.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Internal pumping system for improved cooling.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compatible with open and closed circuits (LST9).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Easy purging and start-up with filling system.<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>Who is the LDC40 dual cartridge seal intended for?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">This cartridge has been designed with industrial maintenance departments (MRO), process engineering and machine builders in mind who need a reliable sealing solution for their agitation equipment.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">So, if you work with industrial agitators and you are looking for a durable and efficient sealing solution, at Lidering we design and manufacture cartridges such as the LDC40, adapted to the requirements of your production process. <a href=\"https:\/\/www.lidering.com\/en\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact our technical team<\/a> and find out how to improve the sealing and performance of your installation.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In industrial agitator applications, one of the biggest sealing challenges is to ensure lubrication when the product does not come into contact with the mechanical seal. As we told you in the post on Manufacturing high performance mechanical seals for reactors, this often occurs in reactors or vessels where the process fluid is in the&hellip;&nbsp;<\/p>\n","protected":false},"author":2,"featured_media":19714,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[201,208],"tags":[],"class_list":["post-19701","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lidering-safe-industry","category-mechanical-seals"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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