McLean Contracting Company needed a high-reach floating crane to install offshore power line supports in Baltimore. The highest lift was 400 feet above water. Liftech evaluated the feasibility of retrofitting their 400T Baltimore floating crane with a long jib to perform the lifts.
Liftech developed the design criteria, assisted with developing a conceptual jib erection scheme, reviewed crane system strength and stability, and developed stay and strut concepts.
For this type of system, 2nd order (P-Delta) effects, or the increase in displacement caused by the loading eccentricity, are significant. Advanced analyses were used that accounted for this phenomenon.
Naval architect Argonautics Marine Engineering, Inc. performed a peer review of vessel stability analysis.
McLean Contracting Company
Glen Burnie, Maryland, USA