Inspection of Three Forged Wire Rope Clips from the Port 15 Tonne Crane Aboard HMCS PRESERVER
Defence Research and Development Canada Atlantic Research Centre Dartmouth, Nova Scotia Canada
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DRDC Atlantic Research Centre Dockyard Laboratory Atlantic DLA was requested by HMCS PRESERVER to conduct an inspection on three forged wire rope clips involved in a failure of the port crane Ref. A. The rope clips were model G-450 Red-U-Bolts manufactured by The Crosby Group under the trade name Crosby registered trademark Clips. On April 22, 2014, the cranes cables were being lubricated as part of the routine maintenance procedure and the tip of the boom was raised a few feet above its cradle. The ends of the cables on the crane are terminated by looping over a structural member, folding the cable back onto itself and securing the end with wire rope clips, as shown in Figure 1. The end of the cable at the base of the crane pulled through the wire rope clips, causing the boom to drop onto the cradle. Three of the four wire rope clips were recovered and sent to DLA for examination and to determine if there was any evidence that the clips contributed to the failure Figure 2. A pristine forged wire rope clip, still in its original packaging, was supplied to DLA to provide a baseline for comparison.
- Couplers, Fasteners and Joints
- Military Forces and Organizations