Saipem’s semisubmersible rig “Scarabeo 4” left Viktor Lenac Shipyard (Rijeka, Croatia) the 23th November 2009, after 88 days of maintenance and reparation activities. The project was completed two days before the scheduled deadline.

In this period 26,000 m3 of suspended scaffolding was installed on the rig and 200 tons of steel has been replaced (decks, shale shaker area, complete mud pits, etc.), including 60 tons of steel outfitting (different stairs, platforms, foundations, etc) and 60 tons of pipes (fire fighting, drain, SW, drill water, diverter, etc). Moreover, part of the HP mud line has been renewed and completely tested at 500 bar (7500 PSI). In accommodation structures all ceiling panels (with air diffusers) have been renewed in wet areas. Additionally, complete renewal of sanitary pipelines has been executed (copper pipes changed with Pvc G&F system), in total length of 1.5 km. Finally, full application of paint work on all new installed steel (6000m2) has been carried out.

Strict HSE standards were respected during the project, involving 200 to 300 workers and engineers. Great attention was also given to environmental protection, with 500 meters of inflatable boom deployed around the rig and daily monitoring of sea quality, noise level, etc.

During the project the rig was moored along quay nr. 9 (off-shore site) with two access barges (18 x 40m) and serviced with two mobile cranes - 350t with boom radius of 126m and 95t with boom radius of 40m. Transport of workers onto the rig, and fire escape access, was also made utilising two elevators and two stair towers.

All activities, including works done by rig crew and Saipem subcontractors, were coordinated by a project team, comprising Mack and Viktor Lenac engineers.
QA/QC, as well as HSE activites, were assigned to MACK.

MACK's project team also participated in the supervision of execution of steel, pipe, electrical and mechanical works, and superstructure works, as well as in communication and coordination of works with the Owner's representative.

Mack also played a significant role in the commercial management of the project.