{"id":7590,"date":"2022-06-14T07:15:55","date_gmt":"2022-06-14T07:15:55","guid":{"rendered":"http:\/\/www.condra.co.za\/?p=7590"},"modified":"2022-06-14T07:15:55","modified_gmt":"2022-06-14T07:15:55","slug":"customised-design-wins-anglolan-crane-order","status":"publish","type":"post","link":"https:\/\/condra.co.za\/en\/customised-design-wins-anglolan-crane-order\/","title":{"rendered":"CUSTOMISED DESIGN WINS ANGLOLAN CRANE ORDER"},"content":{"rendered":"An order for an overhead crane and gantry specifically designed to overcome delivery and functionality constraints has been placed by Consulmet Pty Ltd on crane and hoist manufacturer Condra. Manufacture of the crane, which is for a mine in Angola, began in April.\r\n\r\nA customised proposal for a product designed and manufactured in South Africa won through against tenders submitted by several rival firms headquartered abroad.\r\n\r\nThere were two challenges. First, the mine needed to be able to position the crane over three milling and screening areas which will be constructed in phases and serviced by multiple conveyors on either side. Second, the nature of access roads to the site dictated that the 28-metre-span crane be disassembled into 12-metre containers.\r\n\r\nUnsuccessful tenders put forward a variety of designs based on portal crane configurations limited to the first mill only. These would have been unable to service future units because of conveyors interrupting the portal rail route.\r\n\r\nBy contrast, Condra\u2019s solution proposed a double-girder overhead crane running along an extendable crane gantry erected initially over just the first milling area. The gantry\u2019s legs will be sited between the conveyors to allow uninterrupted crane movement over them. The gantry will later be extended to allow the crane to service additional milling areas as and when they are built.\r\n\r\n
\"\"

Typical overhead cranes (not the actual crane for Consulmet) under
manufacture at Condra\u2019s Johannesburg factory.<\/p><\/div>\r\n\r\nRoad transport limitations were overcome by designing the 26-metre-long overhead crane girders to be spliced in two places, and by reducing gantry leg height to match the 12-metre length of the flatbed transports. Additional completed gantry height will be achieved by concrete plinths cast as part of the milling area foundation, and by steel pedestals incorporating the crane\u2019s end-carriages fastened below the crane girders.\r\n\r\nEffective lifting height after commissioning will be 16 metres.\r\n\r\nConsulmet Pty Ltd\u2019s 50-ton crane and 29-metre-long gantry will first assist with milling area construction before its role moves to plant maintenance.\r\n\r\nCondra will draw on several decades of spliced girder experience during the manufactured of this crane, which is a scaled-down replica of an 80-ton machine installed at a Rustenburg mine.\r\n\r\nEach 26-metre box girder will be delivered in three sections manufactured with built-in camber, then spliced on site in two places ahead of installation. At the splices, steel plates welded to the four inside faces of the male section will deliver a friction grip to reinforce girder strength and integrity beyond that delivered by the splice bolts alone. Bolt holes will be reamed and the bolts themselves machined for an exact fit that will retain camber after assembly.\r\n\r\n\u201cThis proves once again that a bespoke, designed-for-purpose approach to the customer\u2019s requirements will usually carry the day,\u201d commented Condra\u2019s managing director, Marc Kleiner.\r\n\r\n\u201cIt would have saved the customer money to manufacture girders integrally, but road routes to some African mines continue to present obstacles to the steerable dollies needed for delivery,\u201d he explained.\r\n\r\n\u201cIn this case, no crane component will exceed the stipulated twelve-metre load length of the five semi-trailer trucks that will carry everything to site.\u201d\r\n\r\nTo be operated in the open air, the 50-tonner\u2019s box girders are sufficiently large to need Condra\u2019s patented storm brakes against wind loading. Anemometers will activate these safety devices in two stages, first sounding a siren at a wind speed of 50 km\/h, then automatically engaging the storm brakes at a wind speed of 70 km\/h, overriding crane operation and securing the machines against further movement.\r\n\r\nWeather covers will protect all motors, and the crane will feature frequency drives throughout. Both of the crane\u2019s 26-metre-span box girders will be fitted with full-length walkways. Crane control will be by radio remote with pendant back-up.\r\n\r\nDelivery of Consulmet Pty Ltd\u2019s 50-ton overhead crane is scheduled for the end of June.\r\n","protected":false},"excerpt":{"rendered":"An order for an overhead crane and gantry specifically designed to overcome delivery and functionality constraints has been placed by Consulmet Pty Ltd on crane and hoist manufacturer Condra. Manufacture of the crane, which is for a mine in Angola,…","protected":false},"author":4,"featured_media":7591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-7590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","entry","has-media"],"_links":{"self":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts\/7590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/comments?post=7590"}],"version-history":[{"count":1,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts\/7590\/revisions"}],"predecessor-version":[{"id":7596,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/posts\/7590\/revisions\/7596"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/media\/7591"}],"wp:attachment":[{"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/media?parent=7590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/categories?post=7590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/condra.co.za\/en\/wp-json\/wp\/v2\/tags?post=7590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}