Lifting system ensures accurate weighing of jackup

Offshore staff

DUBAI, UAE – Hydraulics specialist Enerpac, with distributor Al Masaood Trading, Dubai, has supplied Lamprell with an EVO-Series synchronous lifting system to weigh a newly completed jackup rig.

The system monitors and manages lifting, lowering, weighing, alignment and load transfer procedures of non-uniform distributed heavy loads.

The full package comprised a 12-point synchronous EVO weighing system, two 600-metric ton hydraulic jacks, four 200-metric ton hydraulic jacks and accessories. Al Masaood Trading supplied the EVO system to Lamprell within four weeks to meet a tight project timescale.

According to Enerpac, space restrictions under the jackup meant alternative weighing systems would have entailed a costly rework to the load structure. To make its system more compact, the contractor used calibrated high pressure transducers in place of load cells.

The equipment monitored the position and load of each lifting position, comparing it with a global datum and adjusting to the desired target position. Movements were managed within permissible load and synchronous stroke tolerance parameters.

During weighing of the cantilever and drill floor substructure, the accuracy of the lifting synchronization, added, meant that the difference in plunger stroke of each cylinder was less than 1 mm.

05/01/2015

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