The Balder roller coaster was opened in 2003 with 8.8\/10.9 carbon steel screws that began corroding, rusting and braking after only a few years. Liseberg started replacing the carbon steel screws with A4 screws, but these were too weak and also started breaking.<\/p>\n
A strong but flexible and fatigue resistant screw was needed to secure the roller coaster rails to the wooden frame, which expands, contracts and moves throughout the different seasons. Corrosion resistance was also necessary to deal with the impregnated wood, and the corrosive local environment caused by vehicle emissions from the adjacent E6\/E20 highway and salt water from the nearby sea.<\/p>\n
The Liseberg amusement park approached BUMAX for a solution, and 355 mm long specially designed M10 BUMAX\u00ae 88 screws were used to successively replace the existing carbon steel screws between 2009 and 2018.<\/p>\n
As of March 2019, no issues have been reported with the BUMAX\u00ae 88 screws installed.<\/p>\n
BUMAX cooperated with Liseberg to develop a custom-made BUMAX\u00ae 88 screw specifically for use on the Balder roller coaster.<\/p>\n
One of the main reasons why BUMAX\u00ae 88 was a success compared with the fasteners Liseberg had previously tested was its excellent fatigue resistance. Third-party tests have shown that standard BUMAX\u00ae 88 can withstand 10 million cycles at a preload stress of 400\u00a0MPa with no screw fracture. This compares with 0.4 million cycles before an A4-80 screw fractures.<\/p>\n
Cost savings<\/strong><\/p>\n Before all the screws were replaced with BUMAX\u00ae 88, fractured screws had to be replaced on an ad hoc basis, which resulted in ongoing costly maintenance and operational delays for the roller coaster.<\/p>\n Safety benefits<\/strong><\/p>\n Roller coaster safety is paramount and BUMAX\u00ae 88 ensures that the roller coaster continues to function safely. There is also now no need to replace screws on the roller coaster, which previously required potentially risky maintenance work at height for the Liseberg maintenance team.<\/p>\n Environmental benefits<\/strong><\/p>\n Stainless steel is 100% recyclable and retains its original physical properties in the process. This recyclability reduces the use of virgin material and lifecycle carbon emissions.<\/p>\n","protected":false},"excerpt":{"rendered":" Customer demands The Balder roller coaster was opened in 2003 with 8.8\/10.9 carbon steel screws that began corroding, rusting and…<\/p>\n","protected":false},"author":1,"featured_media":2137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-2136","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-customer-case","market_segment-general-engineering"],"yoast_head":"\n