VideoRay in OAT for McDermott’s LV-108

A VideoRay Pro 4 Remotely Operated Vehicle (ROV) has supported the Offshore Acceptance Testing (OAT) for two cranes on McDermott’s newest vessel, the Lay Vessel 108 (LV-108).

The LV-108 is a pipe lay vessel, measuring 434 ft long and 89 ft wide. The LV-108 currently undergoing fitting and test of two active heave compensated (AHC) cranes, a 100 ton and a 400 ton, both made by National Oilwell Varco of Kristiansand, Norway.

The VideoRay Pro 4 ROV was used to observe a marker rope attached to a five ton test fixture attached to each crane and lowered to a depth of about 100 meters. Engineers then relied on the video image from the Pro 4 ROV to assist them in verifying the accuracy of the motion reference unit that cancels out the transfer of the vessel movement to the load being held by the crane in real-time.

The accuracy of this measurement is a critical element for deep sea construction. The VideoRay ROV’s ability to capture high quality video and record data in real-time to the topside control unit was a key factor in determining whether or not the cranes were up to standard.

The testing took place in the North Sea on the Port of Kristiansand, off the southern coast of Norway.

VideoRay expert and instructor Steve Van Meter of Van Meter Consulting, Cocoa, Florida conducted the ROV testing on the LV-108, under contract to Proceanic Engineering of Houston, Texas. This is the second AHC crane test conducted by Van Meter Consulting for McDermott. McDermott first commissioned Van Meter Consulting in 2012 to support the testing for the Lay Vessel 105 in the Atlantic Ocean off the coast of Spain.

Press Release