Titan Re-Floats Clipper Cheyenne

Monday, July 15, 2002
On June 3, 2002 the 5,970 dwt, 104m x 20.5m x 4.9m “Clipper Cheyenne”, sunk alongside the dock at Foynes, Ireland in the pristine waters of the River Shannon, while ballasting to load a floating dredger. The vessel sank in a position alongside and parallel to the quay with the bow of the vessel to seaward, a list to starboard and laid in approximately 11 meters of water at low tide. The tidal range was about 4 meters on spring tides with virtually zero visibility and conditions outside of the hull were further exacerbated by a strong river current. The “Clipper Cheyenne” had 244 tones IFO 180, 36 tones diesel oil, and 11,000 liters lube oil onboard. Immediately upon being notified of the incident, a Titan Salvage Master and Salvage Engineer were dispatched to the scene via a chartered aircraft from Titan’s UK Salvage Depot. Soon after arrival Titan was awarded a contract to plug vents to control the escape of hydrocarbons from the vessel. Titan was awarded the re-floating contract on a Lloyd’s Open Form on June 5, 2002. Titan quickly began mobilization of equipment & people from their New Haven, UK and Ft. Lauderdale, Florida warehouses. A total of 19 Titan personnel, including Naval Architect, and Diver/salvors were sent to the site. During discussions with the local Harbor Master and Coast Guard, it was decided that the risk of pollution was greater if an attempt to remove the hydrocarbons prior to re-float was undertaken. Therefore it was decided to completely contain the hydrocarbons within the vessel. Various refloating scenarios were evaluated using detailed computer models. The models showed that without any external support the vessel had very little, if any, stability when she left bottom. This lack of stability was the principal challenge for re-floating the vessel. To provide this support it was decided to first roll the vessel to port and then let her lay against the pier during the re-float. A barge was then attached to the stern of the vessel to provide additional waterplane area during the most critical phases. As an additional effort to improve the stability situation, the crane booms of the CLIPPER CHEYENNE were lowered and removed, thus decreasing the overall center of gravity for the vessel. For the refloat, the vents on the wing tanks were blanked and fitted with blow down fittings and modified vents. To prevent the air from escaping from the ballast tanks, all the valves for the ballast system had to be closed by divers. Pumps were then fitted in the accommodation and foscle areas to give buoyancy up forward and increase the ground reaction aft. The starboard wing tanks were blown down which caused the vessel to roll to port and come to rest against the pier as planned. After further prep, the watertight door to the pump room was opened and the remaining wing tanks were blown down in a calculated and controlled order, bringing the vessel to the surface on Sunday July 7, 2002.
Maritime Reporter February 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

NV Charts Relocates US Headquarters

NV Charts has moved its offices and warehousing facilities to centrally-located Deale, Maryland, U.S. In announcing the move, Hasko Scheidt, CEO, said, “As we’ve grown and need room for expansion,

Royal IHC Merges Four Units into IHC IQIP

Royal IHC (IHC) has integrated four of its business units – IHC Hydrohammer, IHC Handling Systems, IHC Sea Steel and IHC Fundex Equipment – into one new organization,

Rushton Gregory Inks Gemeco Marketing Deal

Rushton Gregory Communications announced today the latest addition to its industry-leading client roster, Gemeco Marine. Based in Lake City, South Carolina,

Ship Repair & Conversion

Wärtsilä, CME Offer ‘Scrubber Finance’

Funding concept promotes installation of scrubber systems by offering financing to shipowners, with returns taken from fuel price spread   In a move intended

Alphatron Marine VSAT Systems for 11 Workboats

Alphatron Marine has signed a lease contract with Seacontractors for no less than 11 vessels to provide satellite hardware and data solution packages.   Alphatron

Caterpillar, Uptake to Create Analytic Solutions

To help customers around the world better understand the health of their equipment and optimize machine availability, Caterpillar Inc.today announced it has

 
 
Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Port Authority Salvage Ship Electronics Ship Simulators Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1228 sec (8 req/sec)