Bollsta Dolphin ROV Hangars project includes two 115T mirrored structures for port and starboard side of the rig. The project was commissioned for NAVIC by Oceaneering which has been contracted by Chevron to deliver ROV Hangars and a control unit for the newly built rig Bollsta Dolphin, being constructed in Korea by Hyundai Heavy Industries. The rig is planned on contract with Chevron from 01.06.2015 to 30.06.2019. Rig design is from Moss Maritime, type CS 60E Semisubmersible.
Key information and technical data:
- Main external dimensions: Length = 14,2 meters , Width = 9.0 meters, Height measured in beams axis = 9.75 meters,
- Main operation structure levels: floor, mezzanine platform, maintenance platform,
- Main profiles structure HE300B & IPE300,
- Purpose of construction: Launch and Recovery of Remotely Operated Vehicles (ROV) through a Moonpool Hatch,
- The Moonpool Hatch is a opened by 4 panels and using 4 separately hydraulics cylinders, size (light opening) is 6.0 x 5.0,
- ROV protection: TMS, ROV Cage and Cursor,
- Driving element of launch and recovery: Winch unit, Safe working load – 15 tons,
- Driving element of Cursor/TMS: Guide Wire System (GWS), maximum wire tension – 70 tons,
- ROV Control Room: 20ft container with all equipment to operating system located inside of Hangar on mezzanine deck,
- Roof Hatch: removable element, allows to insert equipment into the Hangar
- Internal systems: HVAC, plant fresh water, plant air, instrument air, hydraulics, drain system
- External systems: Deluge installation to protection against heat walls and roof
- All structure was designed to resist fatigue stresses from operating and environmental loads
Based on good practical experience from similar projects in the past, also considering clients’ suggestions, NAVIC engineers have optimized structural and mechanical design, implementing solutions and upgrades, which solved all issues that occurred earlier and made the construction safer and more operational-friendly.