Since 1990, Klohn Crippen Berger (KCB) has provided design and construction engineering services, on a nearly continual basis, to Public Works & Government Services Canada (PWGSC) for a wide variety of projects at the Esquimalt Graving Dock. This graving dock, built in 1927, is the largest civilian dry dock on the west coast of the Americas. In our most recent assignment, PWGSC retained KCB for fatigue analysis and retrofit design for the existing 150t rail mounted, level-luffing crane structure. The 150t crane, shown here lifting the upper portion of an adjacent hammerhead crane for maintenance, is used predominantly as a general yard crane to support dry dock operations.
KCB investigated the structure using finite element modelling, to identify areas where fatigue may be an issue based on current usage characteristics and estimate the future fatigue life for the crane. Slewing, luffing and rail traveling actions were compared to assess the dominant fatigue cases. These analyses were used to formulate an inspection and retrofit program to monitor the fatigue performance of the crane, and thus assure crane safety.
A selection of our work at the dock includes: rehabilitation and re-commissioning of the 150t crane after luff drive failure; total rehabilitation of the 45t hammerhead crane; mechanical and seismic upgrading projects for dry dock pumping equipment; crane rail alignment work; jacking analysis, and field inspections for the 150t crane; fendering improvements; upgrade of buried utilities; retractable oil boom containment system; maintenance planning; and a master plan for development and future use of dry dock facilities.
- Field investigations and inspections
- Rehabilitation and re-commissioning
- Maintenance planning
- Master plan development