SURVEY DRY TRANSPORT SF DRY DOCK #1



Project Summary

To transport the old and decommsioned San Francisco Dry Dock #1 from San Francisco to a scrapyard in China, the Dockwise owned and operated semi-submersible heavy-lift ship TERN was used. The 408 ft long dry dock was surveyed and its residual strenght  assessed. Dry transport was deemed feasibile on the TERN with its 415 ft long cargo deck. Late October 2014, the dry dock was towed from its storage berth at the Port of San Francisco with 4 local tugs and floated over the submersed TERN at the nearby deep water anchorage. After careful positioning of the dry dock, the TERN was deballasted and the dry dock lifted out of the water. The cribbing was inspected and the seafastening operation started. After final inspection of all the seafastenings, the transport approval certificate was issued and the TERN departed with destination Zhoushan, China. 
    

Scope of Work

The project scope included:










Project Photographs












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


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Est. 1992


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Survey the dry dock and review the tow preparations;
Review the Dockwise prepared CSM (Cargo Securing Manual);
Survey the assist tugs to be used for the wet tow and float-over operation;
Check cribbing arrangement as laid out on heavy-ship deck;
Attend wet tow and loading operation of the dry dock onto the TERN;
Survey the seafastening installation;
Issue transport approval certificate after final inspection.
Tern loaded with SF drydock
The loaded TERN anchored in the San Francisco Bay
SF drydock transport on Tern - Departure draft SF drydock transport on Tern - Inspecting grillage SF drydock transport on Tern - Timelapse camera set-up SF drydock transport on Tern - Departure from San Francisco SF drydock transport on Tern - At anchor after loading SF drydock transport on Tern - Seafastening under dock SF drydock transport on Tern - Drydock safely loaded SF drydock transport on Tern - Float over in progress SF drydock transport on Tern - Alignment over centerline SF drydock transport on Tern - Drydock lifted 2 ft out of water SF drydock transport on Tern - A tight fit SF drydock transport on Tern - Inspecting cribbing under dock SF drydock transport on Tern - Survey assist tugs SF drydock transport on Tern - Cribbing ready on deck SF drydock transport on Tern - Cribbing inspection SF drydock transport on Tern - Ready for loading SF drydock transport on Tern - Hooking up tugs at sunrise SF drydock transport on Tern - Sunrise over the submersed Tern SF drydock transport on Tern - Towing drydock to the submersed heavy-lift vessel SF drydock transport on Tern - Arriving at the submersed Tern SF drydock transport on Tern - Panoramic view SF Bay SF drydock transport on Tern - Theodolite ready for alignment drydock
Cribbing on cargo deck
Cribbing on cargo deck
Connecting assist tug
Connecting assist tug
Floating dry dock over TERN
Floating dry dock over TERN
Drydock on cribbing
Drydock on cribbing