Case studies

Removal of heavy fuel oil from oil spill on vessel in port

Odin Diving A/S was hired to remove 400 sqm of oil residue on the stern area of a vessel after an heavy fuel oil transfer hose had broken.

The environmental requirements of the port dictated that all oil residue had to be recovered.

A team was assembled, together with a steam recovery system which lived up to the environmental requirements of the port authorities.

All oil was removed and all oil residue was disposed at an approved oil sludge recycling facility.

Case studies

A collision between a jack-up and a platform and a FPSO resulted in a broken off 200-ton helideck. Odin diving A/S was appointed for the subsea work in order to safely recover the helideck to the surface.

Initial inspection with ROV was conducted for planning purposes. A 5-man dive then cut 4 windows in the aluminum sandwich construction in order to install a 4 cs of 60 ton lifting chain.

After installation of lifting chains was completed, the helidecks was broguth safely to shore by a 400-ton lifting barge.

Case studies

MPI and visual inspection at Femern Belt construction site

Odin Diving A/S was appointed to perform third party inspections of more than 300 meter of underwater weld seams at a Femern Belt facility.

A team of 1 diver supervisor and 3 diver technicians were mobilized for the job. All were certified underwater inspection technicians, certified as either CSWIP 3.2U or Lloyds NDT Inspector.

All weld seams were initially cleaned by HP water jetting. Close Visual Inspection (CVI) were then performed on all weld seams. Finally 5% of the inspected length of weld seams were tested my Magnetic Particle Inspection (MPI).

Case studies

UWILD on jack-up rig

Odin Diving A/S performed UWILD on a jack-up rig in December 2021. Scope of work was visual inspection and NDT of chord and cross brace to spudcan connections. New anodes were also to be fitted at the lower bays.

Upon initial inspection if could be seen that each spudcan top was covered in 3.5 to 4 meters of very hard clay. Approximately 1000 cubic meters of clay was removed before visual inspection and Eddy-Current could be performed by the NDT certified divers (CSWIP 3.2U) under the supervision of DNV.

60 anodes were cut of the existing brackets and new anodes welded on by approved wet welders.

Case studies

NDT on jack-up rig

As Odin Diving A/S have several divers with a level 2 underwater NDT certificate (CSWIP 3.2U), we were asked by a client to perform eddy-current NDT inspection and close visual inspection on spudcan to Chord and braze connections on all 3 legs, under the supervision of Lloyds Register.

As the jack-up was sitting high and dry on a heavy lift vessel, our divers for once did not have to get wet. All connections on all 2 legs were cleaned and inspected within 60 hours to the satisfaction of client and Class.

Case studies

Odin Diving A/S performs underwater propeller blade repair in less than 24 hours.

A 180-meter bulk carrier in laden condition en route from Baltic Sea to SE Asia encountered vibration and greatly reduced performance after sailing in an area of severe ice conditions.

Upon inspection, the cause was found to be 3 out of 4 blades on the main propeller, which were all bent due to ice impact.

As vessel was in laden condition, repair works had to be performed underwater.

Odin Diving A/S mobilized a team of experienced diver technicians, to cold straighten the damaged blades back to their original shape.

After 10 hours of diving, the 3 damaged blades on the propeller were straightened back to their original shape. All work done to full satisfaction of attending surveyor.

Vessel was able to continue its voyage in less than 24 hours after arriving in port.

Subsequent sailing test showed no vibration or loss of original performance.

Case studies

A 55 meter superyacht in Thailand had collided with rocks, resulting in severe vibrations from the propeller and loss of performance on its port propeller.

​Odin Diving A/S mobilized a team of 4 divers/technicians, who upon arrival made an initial inspection to determine the condition of the propeller. It was found that 3 out of 4 blades on the 2.6 meter port propeller were bent. The starboard propeller was undamaged.

​The 3 bent blades were straightened back to its original shape and the propeller was polished to further reduce any vibration or lack of performance. The procedure was witnessed by the Class surveyor, who approved the result based on measurements and video documentation. A sea trial showed that there was no lack of performance anymore and vibration was not noticeable. Time from client´s confirmation to completed job, including sea trial, was 71 hours.