[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-156772-105":59,"doc-detail-156772-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","bearing-it-in-mind-ensuring-rolling-element-bearing-service-life-for-cement-fans","Bearing it in mind - Ensuring Rolling Element Bearing Service Life for Cement Fans","","Rolling element bearings are essential for cement fans, and their service life depends on correct selection, alignment, loading, and lubrication-related design choices. The document explains typical bearing life ranges, identifies failure drivers such as excessive vibration and surface fatigue (spalling), and uses L10 fatigue life conventions to frame realistic hour targets. It also compares bearing types by misalignment tolerance, discusses monoblock alignment with measurement verification, and highlights skidding risk from insufficient minimum load and clearance effects to reduce premature failure.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/bearing-it-in-mind-ensuring-rolling-element-bearing-service-life-for-cement-fans/156772/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/bearing-it-in-mind-ensuring-rolling-element-bearing-service-life-for-cement-fans/156772.png","ImageObject",300,407,{"name":92,"@type":93},"Emma Mercer","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-12","2026-08-29",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What service life range is typical for rolling element bearings on cement fans?","Question",{"text":113,"@type":114},"Some fans can run for over 40 years on original bearings, but a more typical rolling element bearing life is about 3–10 years, with some cases failing in under one year.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Which bearing types cope better with misalignment in fan applications?",{"text":118,"@type":114},"Deep groove ball bearings and roller bearings have limited misalignment capability, while self-aligning ball bearings and spherical roller bearings can tolerate significantly more misalignment.",{"name":120,"@type":111,"acceptedAnswer":121},"How does minimum load affect bearing reliability and skidding?",{"text":122,"@type":114},"Bearings require a minimum load to ensure balls or rollers rotate properly. If load is insufficient, skidding occurs, and roller bearings are more prone to skidding than ball bearings, so fan bearings should be specified for higher minimum load than manufacturer steady-load guidance.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},156772,1787965965,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":24,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":130,"read_time":144},962084925502,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","Dr John Irons, Halifax Fan UK, and Diane Wang, Halifax Fan China,  \noutline how proper design and maintenance can help to ensure that rolling element bearings used for cement fans achieve a good service life.  \nBearing it in mind  \nF  \nans are rotating machines and so need to use bearings. There are a variety of bearing types, lubrication methods and other features that can be employed to ensure that the fan runs with  \na good bearing life. The two main types of bearing are rolling element bearings and oil film bearings, with rolling element bearings being the more common type. This article considers rolling element bearings.  \nIn some cases, fans have run for over 40 years with the original bearings. However, a more typical life for rolling element bearings on fans is 3 – 10 years. There are various factors that affect bearing life with some bearings having problems that lead to failure in less than one year.  \nThere can be other issues such as excessive vibration. In addition, there are the changing requirements to consider for machinery, such as noise and pollution. Consideration and evaluation of the various factors involved increases the bearing life and results in a fan that will give years of trouble-free operation.  \nTypes of bearing  \nRolling element bearings rely on balls or rollers to transfer the weight of the rotating shaft to the support structure. The main types used for fans are deep groove ball bearings, roller bearings, self-aligning ball bearings and spherical roller bearings. The first two bearing types have little capability to cope with misalignment between the bearings. The second two bearing types can cope with significantly more misalignment between the bearings.  \nGood alignment can be achieved between the bearings by putting them in the same bearing housing – a monoblock. With modern five axis machines, it is possible to machine bores with good concentricity. Using a  \nco-ordinate measuring machine (CMM) it is possible to carry out cross-concentricity measurements between the housing bores to confirm the alignment. This ensures maximum life for deep groove ball bearings and roller bearings. However, using a mono-block bearing unit requires the rotor to be overhung.  \nSome designs of deep groove ball bearings and roller bearings have a spherical outer surface and sit in a housing with a matching spherical surface. This allows the bearing to swivel in the housing to give concentricity. The most common type of bearing using this technique has a saddle housing, with the bearing protruding beyond the housing. Split roller bearings use rollers to maximise bearing life so are one of the main types of bearing with a spherical seat. With a spherical seat, the bearing seal has to be part of the bearing.  \nLarge rotor being installed on site – oil film bearings.  \nCement cooler fan – monoblock bearing unit.  \nCement cooler fan – plummer block bearings.  \nSpherical roller bearings and self-aligning ball bearings have a spherical outer race to allow the bearings to align themselves to each other. The inner race has to be concave, which means that one row is unloaded with an axial load. Therefore, these bearings employ two rows of the rolling elements. Although spherical roller bearings and self-aligning ball bearings have a tolerance for lack of concentricity, it is not very large. This is due to the effect of misalignment on the bearing shaft seals and the movement that can happen within the bearing.  \nEffect of bearing load  \nRolling element bearings have a localised surface stress concentration where the load goes through a point (ball) or line (roller). All rolling element bearings will eventually fail due to surface fatigue associated with the stress concentration. This is known as spalling. Fatigue life for rolling element bearings is based on well-established formulas and the dynamic load rating. Fatigue is grounded in statistics, and for bearings, the fatigue life is based on the point at which 10% of the","cbCaiaXNu3ctaOU7","https://ap.wps.com/l/cbCaiaXNu3ctaOU7","pdf",653306,"English","# Types of bearing\n## Rolling element bearing overview\n## Alignment methods and housing choices\n# Effect of bearing load\n## Surface fatigue and spalling\n## L10 life calculation and typical hour targets\n## Minimum load, skidding risk, and clearance","[{\"question\":\"What service life range is typical for rolling element bearings on cement fans?\",\"answer\":\"Some fans can run for over 40 years on original bearings, but a more typical rolling element bearing life is about 3–10 years, with some cases failing in under one year.\"},{\"question\":\"Which bearing types cope better with misalignment in fan applications?\",\"answer\":\"Deep groove ball bearings and roller bearings have limited misalignment capability, while self-aligning ball bearings and spherical roller bearings can tolerate significantly more misalignment.\"},{\"question\":\"How does minimum load affect bearing reliability and skidding?\",\"answer\":\"Bearings require a minimum load to ensure balls or rollers rotate properly. If load is insufficient, skidding occurs, and roller bearings are more prone to skidding than ball bearings, so fan bearings should be specified for higher minimum load than manufacturer steady-load guidance.\"}]","Bearing it in mind - Ensuring Rolling Element Bearing Service Life for Cement Fans | PDF",13]