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Dragline capacity assessments
Challenge
- Current safe capacity of the dragline structure unknown
- No design standard for design in public domain - loading
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- Forcing functions significantly changed by digital control
systems
- Ageing structures & increased duty with time
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Methodology
- Based on leading edge reliability engineering principles
- Force spectra defined by instrumentation and testing
- FEA & structural design compliance to AISC & BS 7608
- Recommendations for member upgrades for operating at higher
mean RSL levels within a safe working envelope
- Dragline capacity & components life assessment of key
mechanical components and electrical motors for operating at
higher mean RSL levels
- Optimal bucket sizing for maximizing production and
reliability
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Outcomes
- Dragline capacity assessments completed on 65 draglines for
BHPB (Australia, USA & SA), RioTinto, Anglo, Xstrata, Peabody
(USA)
- Draglines operating at 115%RSL to 125%RSL within safe
working envelope after up grades
- Upgrades recommended for improved reliability
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