Lifting analysis of Mooring Support Structure (MSS) in offshore tower yoke by top panel stacking structure method

Abstract

One indicator of the success of an offshore development project is its completion on time. Supporting factors of this time are the availability of lifting equipment that has a high capacity. Lifting the top panel on the MSS tower yoke system with all its main components is done by planning using crane tools that are improvised by the stacking structure method. The stacking structure method is done by doing all the installation of the primary and secondary structures on the top panel carried out at the bottom (ground) then lifted onto the tower yoke system by using several cranes lifting equipment. Whereas the determination of the center of gravity and the lifting point using SACS (Structural Analysis Computer System) software found that the top weight of the MSS Panel was 3705 KN with the center of gravity (x, y, z); (12.10 m, 9.43 m, 31.66 m) and MSS stacking top panel using four lifting points requires four cranes. The stacking structure method has a high potential used as a procedure for reducing offshore development costs.