Category: Bulk Projects

Bauxite Unloader Structural Modification

The client operates two unloaders at its facility in South America.  One of the unloaders is experiencing chronic fatigue cracking.  The unloader was shut down for operation several times for emergency repairs of critical fatigue cracks.  The client was concerned with the structural reliability of the unloader, and crack repairs and inspections were disruptive to the operation.  The client retained Liftech to provide engineering…

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Bauxite Unloader Study

Two bauxite unloaders of identical design have been operating for over 50 years. The operator wished to continue operations for another 15 years. Liftech analyzed the crane structure to assess the fatigue life for continued operations.

Rio Tinto Alcan Unloader Structure Assessment

The owner of two 40-year-old bauxite unloaders in Quebec, Canada, was evaluating whether to continue operating, to upgrade, or to replace the existing unloaders. As part of the feasibility study, the owner needed a condition assessment of the unloaders by an independent consultant. Liftech performed an on-site visual assessment of the structural condition of the unloaders.

Bauxite Unloader Structural Condition Survey

A bauxite unloader has been operating at a bauxite refinery facility in South America since it was built in 1983. Liftech performed a structural condition survey of the unloader structure and presented significant findings and recommendations in the structural assessment report.

Bauxite Unloader Structural Design Review

Liftech provided structural design review of a bauxite unloader in South America. We reviewed the workmanship of the primary structure, performed finite element analyses, reviewed design drawings, and provided wheel load and stability calculations.

Unloader Seismic Study, Sacramento, California

Liftech performed a seismic response study of a ship unloader on a stiff wharf structure and a flexible wharf structure. The study included a finite element time history analysis and a pushover analysis for three design Operating Level Earthquakes and three Contingency Level Earthquakes used for design by a port on the West Coast of the United States.

Price Systems Log Boom Crane

Liftech provided structural analysis and design for various rotating log boom cranes. The latest was for a 170-foot, 45-ton crane in Valliant, Oklahoma. Liftech also designed and prepared drawings for cranes with radii of 125 feet and 155 feet and capacities ranging from 25 tons to 60 tons. The grapples are either at a fixed radius or mounted on a moving trolley.