The recent maintenance shutdown of Dragline DRE 40 at BMA’s Blackwater Mine included a large scale structural overhaul where the Circumferential Diaphragm of the dragline was replaced. This large plate element weighs over 38 tonnes. To minimise the shutdown timframe, it was important a replacement CD be brought to site fully assembled and ready for installation and weld-out.
A high level project risk assessment was carried out with the client to confirm that all risks associated with the FIELD Engineers proposal could be controlled prior to project kick-off.
The FIELD Engineers consulting team prepared detailed fabrication drawings of a replacement CD based on precise measurement of the existing CD (refer to Laser Scanning page). Fabrication in DGH’s Mackay workshop was overseen by the FIELD Engineers design team who confirmed critical dimenstions during fab to ensure that there would be no surprises for the site team.. The final details of the the CD included the input of the client, and the installation contractor to allow for an efficient installation and weld-out. Drafting and fabrication costs for the new CD were considerably cheaper than other alternatives.
Transport of the new CD to site was arranged by Kane Redfern, FIELD Engineers Logistics Coordinator.
Installation of the CD was overseen at site by Ron Mackenzie, FIELD Engineers structural superintendent, the process was made somewhat easier by the supply of a detailed installation plan from the Engineering office.
Machining and final setting of the mechanical systems below the new CD was overseen by the FIELD Mechanical team of Jon Halliday and Clint Berechree.
The new CD was installed in 36 days and at a considerable cost saving to alternative CD supply options.