Forage offshoreOffshore installation operator

Failed Offshore Crane Boom, Emergency Make-Safe and Dismantling

After an offshore crane boom snapped at its base, DSL designed temporary supports and a portable lifting device from scratch, then safely secured and dismantled the 136 ft boom without any supporting crane.

Chiffres clés

Failed crane boom dismantled: 136 ft
Unsecured block and hook made safe: 2 t
Supporting cranes available: 0

Ingénierie et ConceptionFabricationProjets Brownfield Offshore

A system failure on an offshore crane allowed the boom to rise too far, snapping it at the base. The 136 ft boom was left leaning against its support structure and partly penetrating the deck, with damaged and unstable adjoining accessories and a 2 tonne block and hook hanging unsecured.

There were no existing calculations to develop a solution from, no established procedures for the situation and no crane available to assist with removal. Before anyone could even get onto the structure to evaluate dismantling options, it had to be made stable and safe.

Every aspect of the response was developed from scratch. Our Engineering, Production and Offshore Services departments worked alongside Project Management to plan the work and design the temporary supports, lifting structures and dismantling procedure, drawing on DSL's design and manufacture, decommissioning, specialist rigging and offshore construction capability.

With no other crane in reach, our team also designed a simple but effective portable lifting device to carry out all of the lifting the project required. Once the boom was secured and the lifting device installed, temporary supports and additional support cradles were fitted to take the weight and control the descent of the structure, and the boom was then dismantled in a controlled sequence at deck level.

Témoignage client

“Once again your crews did an excellent job, and very professional on the port crane, we appreciated all of their work and professionalism, a great team.”

Client — Offshore installation operator

Galerie du projet

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