DECO designed and developed an Magnetic Track Vehicule to cut the ship’s hull. When cutting the cast iron rudder hinge a record 450mm cutting depth was recorded
B-Oceania Wreck Removal
On 29 July 2011, the MV B-Oceania collided with the MV Xin Tai Hai. Xin Tai Hai sustained severe damages to her bow area. The damage sustained by B-Oceania was even more extensive. The crew members had to eventually abandon the ship, which sank about 40 minutes after the collision. As Mammoet Salvage took on the project of removing the wreckage, DECO was contracted to execute the cutting job in three stages. The achieved results signify a big step forward for DECO.
The first stage consisted of the cutting of 36 lifting holes from fore to aft. The exact locations were specified by the naval architects of Mammoet. Subsequently, a custom designed cutting frame moved the nozzle into place and continued to cut one hole after the other with exceptional precision. DECO’s UHP abrasive water jet cutting technology is able to make precise and thin cuts with an error margin of 1mm and a smooth cutting edge. The latter is an essential advantage when rigging and lifting the wreck pieces. It guarantees an even distribution of the stress in the hull around the cut hole. It prevents tears or ruptures in the hull during the lifting procedure.
In the second stage long cuts along ship were made in the hull to weaken the hull and to facilitate the sawing motion of the wire saw. For this operation DECO designed a Magnetic Track Vehicle. The MTV runs on electromagnetic tracks and is able to traverse the entire hull while cutting, even on an overhanging ship hull. The robot is remotely operated from the workboat so no dive support was needed.
Finally in the third and last stage a groundbreaking result was booked. When cutting through the rudder hinge to remove the rudder from the wreck a new cutting depth record in cast iron was established. After completion several measurements showed that inadvertently a remarkable cutting depth was reached. DECO attained a cutting depth of 450mm in a single cutting motion.