{"id":13456,"date":"2026-07-18T19:03:08","date_gmt":"2026-07-18T17:03:08","guid":{"rendered":"https:\/\/www.sebatec.nl\/?page_id=13456"},"modified":"2026-10-07T22:52:17","modified_gmt":"2026-10-07T20:52:17","slug":"wear-in-material-conveying","status":"publish","type":"page","link":"https:\/\/www.sebatec.nl\/en\/kenniscentrum\/slijtage-granulaattransport\/","title":{"rendered":"Wear in material conveying: causes and solutions"},"content":{"rendered":"<p><strong>Are your bends, hoses or pipes wearing out faster than expected?<\/strong> Wear is one of the most common problems in pneumatic material conveying, especially with abrasive or glass-filled compounds. In practice, an air velocity that is too high turns out to be the most common cause. The good news: wear is not a given, but the result of a number of factors that you can adjust in a targeted way. In this article you can read where the wear comes from and which solutions deliver the most in practice.<\/p>\n<h2>How do you recognise a wear problem?<\/h2>\n<p>You recognise a wear-driven problem by bends or hoses that have to be replaced again and again, often in combination with abrasive compounds or glass-filled material. Other signs are product contamination (metal particles in the granules), dust formation and eventually leakage or downtime at the worst possible moment.<\/p>\n<h2>Why bends wear out first<\/h2>\n<p>Bends are almost always the most critical wear points in a conveying system. There are three reasons for this:<\/p>\n<ul>\n<li><strong>Impact in the exit zone.<\/strong> Granules hit the outer radius of the bend and slow down there. The wear is therefore concentrated mainly at the exit of the bend, exactly where the wall is loaded most heavily.<\/li>\n<li><strong>The radius.<\/strong> The tighter the bend, the harder the granules bounce against the wall. With a wider radius the material flows through the bend more evenly and wear decreases visibly.<\/li>\n<li><strong>The air velocity.<\/strong> Velocity is the biggest factor: too high a velocity increases wear, dust formation and the risk of angel hair. Many installations therefore aim for an air velocity below about 28 m\/s; for sensitive materials such as PE and PP preferably 20\u201322 m\/s.<\/li>\n<\/ul>\n<h2>The four ways to reduce wear<\/h2>\n<p>With a wear-driven problem we look in this order:<\/p>\n<ol>\n<li><strong>Reduce the air velocity<\/strong>: often the biggest gain, provided you stay above the minimum conveying velocity (otherwise blockages occur).<\/li>\n<li><strong>Increase the pipe diameter<\/strong>: this lowers the velocity and the pressure loss at the same capacity.<\/li>\n<li><strong>Choose the right bend material<\/strong>: hardened stainless steel or glass at the most heavily loaded points (see below).<\/li>\n<li><strong>Optimise the routing<\/strong>: avoid unnecessary bends and keep flexible hose sections as short as possible; a flexible hose wears faster than a fixed pipe.<\/li>\n<\/ol>\n<h2>Which bend material for which material?<\/h2>\n<p>The choice of bend material largely determines the service life:<\/p>\n<div style=\"overflow-x: auto;\">\n<table>\n<thead>\n<tr>\n<th>Bend material<\/th>\n<th>Suitable for<\/th>\n<th>Characteristics<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><a href=\"\/en\/product-category\/piping\/bends\/stainless-steel-bends\/\">Stainless steel<\/a><\/td>\n<td>Standard granules (including PE, PP), not or slightly abrasive<\/td>\n<td>Corrosion-resistant, available in wide radii, economical<\/td>\n<\/tr>\n<tr>\n<td><a href=\"\/en\/product-category\/piping\/bends\/wear-resistant-bends\/\">Hardened stainless steel<\/a><\/td>\n<td>Abrasive and glass-fibre-reinforced compounds (e.g. glass-filled PA or ABS)<\/td>\n<td>Hardened version with a much longer service life at the most heavily loaded points<\/td>\n<\/tr>\n<tr>\n<td><a href=\"\/en\/product-category\/piping\/bends\/glass-bends\/\">Glass<\/a><\/td>\n<td>The most abrasive materials, such as highly glass-filled compounds<\/td>\n<td>Borosilicate glass with 5 mm wall thickness, several times that of a standard stainless steel bend. Copper strip discharges static electricity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Rule of thumb from practice: for recurring bend wear caused by glass-fibre-reinforced plastics, <strong>hardened stainless steel is the standard choice<\/strong>, and for the most abrasive compounds you choose <strong>glass bends<\/strong>, which combine extreme wear resistance with a smooth inner wall. It is often enough to replace only the most heavily loaded bends; the straight pipe sections wear much more slowly.<\/p>\n<h2>Lowering velocity with dense phase conveying<\/h2>\n<p>The biggest structural gain against wear is often in the conveying method itself. Traditionally, granules are conveyed in dilute phase, at air velocities of 15 to 28 m\/s. With <strong>dense phase conveying<\/strong> (also called plug conveying or LVSF, Low Velocity Slow Flow) the material moves through the pipe at very low velocity, in the order of 0.25 to 5 m\/s. This considerably reduces wear, dust formation and energy consumption.<\/p>\n<p>Dense phase is not the best choice in every situation: it requires a higher investment and a more precisely tuned system, and is not suitable for every material or layout. Whether it pays off depends on your material, capacity and installation. We are happy to assess that with you.<\/p>\n<h2>Structural improvements for longer systems<\/h2>\n<p>Air is compressible: as the air travels through the system, its volume, and therefore its velocity, increases. A system that runs neatly at 15 m\/s at the start can shoot up towards 40 m\/s at the end. That is why pipes and bends at the <em>end<\/em> of a long run often wear the hardest. The solution is a <strong>stepped pipeline<\/strong>: pipe diameters that increase in steps and slow down the rise in velocity. For larger systems we include this in the design as standard.<\/p>\n<h2>Solving wear structurally?<\/h2>\n<p>Every situation is different: material, capacity, routing and system type together determine where the gain is. We assess your installation on site, from air velocity and diameter to bend material and routing, and advise what can be done straight away and what pays off structurally.<\/p>\n<p>Not sure which solution best fits your material and installation? We are happy to advise you, without obligation and based on your situation. <a href=\"\/en\/contact\/\">Contact us<\/a>, or go straight to our <a href=\"\/en\/product-category\/piping\/bends\/wear-resistant-bends\/\">hardened stainless steel bends<\/a> and <a href=\"\/en\/product-category\/piping\/bends\/glass-bends\/\">glass bends<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Verslijten uw bochten, slangen of leidingen sneller dan verwacht? Slijtage is een van de meest voorkomende problemen bij pneumatisch granulaattransport,<\/p>","protected":false},"author":2,"featured_media":0,"parent":13459,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-13456","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Slijtage bij granulaattransport voorkomen | Sebatec B.V.<\/title>\n<meta name=\"description\" content=\"Bochtslijtage bij abrasief of glasgevuld granulaat? 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