WHEATSTONE SGS TRANSPORT



Project Summary


For the development of the Chevron-operated Wheatstone Project, a large steel gravity structure (SGS) needed to be transported from its fabrication yard in South Korea to the offload location near Dampier. The TPI Mega Line owned semi-submersible heavy-lift ship MEGA PASSION was selected for this transport. Argonautics Marine Engineering, Inc. was hired by the transportation company to provide project management and engineering for this challenging transport.  In July 2014, the 35,000 t heavy SGS was successfully floated over its cribbing and loaded onto the reinforced deck of the MEGA PASSION. After loading, the SGS was secured with custom designed seafastenings, while the SGS was completed by the yard. Upon completion, the transport left Okpo with destination Dampier. 

Upon arrival in Australia, the seafastenings were removed and the heavy-lift ship ballasted down to float-off the SGS. Using winch wires and project tugs, the SGS was successfully offloaded and handed over to Heerema Marine Contractors for the tow to site and installation on the sea bottom. A Chevron Progress video on the Wheatstone Project including this transport can be viewed here.

Scope of Work


The project scope included:


   











Project Photographs

All aerial photographs courtesy of Chevron Australia Pty Ltd.
















specialists in marine heavy-lift transportation engineering
naval architects
marine surveyors


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Est. 1992


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Project management and liaison with the client;
Prepare loading and offloading procedures, including preliminary ballast plans;
Design optimum stowage arrangement;
Feasibility check of the selected vessel for a potential SGS weight increase to 36,000t;
Stability (intact and damaged) and vessel motion analyses;
Steer the structural analysis of the vessel hull subjected to the high local footprint loads;
Steer the required local vessel deck reinforcements;
Design of the cribbing arrangement to properly support the SGS footings;
Design of custom steel seafastenings and custom fenders;
Participate in the various F2F progress meetings and HAZIDS;
Provide project planning and monthly progress reports;
On-site assistance during loading and offloading operations.
SGS floated over
SGS floated over
SGS secured on deck
SGS secured on deck
MEGA PASSION arrived
MEGA PASSION arrived
SGS floated off
SGS floated off
Wheatstone SGS loaded onto Mega Passion
The MEGA PASSION at anchor after loading the WHEATSTONE SGS
(c) Chevron Australia Pty Ltd