Enerpac

ESET enables users to build a freestanding hydraulic strand jacking gantry from ground level up to a height of 80m with a lifting capacity up to 1600t.

The manufacturer said that the new system had been engineered to signi. cantly reduce transportation and set up costs compared with large cranes. As such the ESET has been designed to be packed into containers for applications such as oil and gas, mining and energy, materials handling and ports, construction and infrastructure.

The gantry is installed on skid tracks, distributing the foot print load for stability. Strand jacks are used to position the gantry system longitudinally. To lift the load, the ESET uses a pair of Enerpac Strand jacks, each with a capacity of 850t. Depending on the ESET con. guration, two or four strand jacks can be used. The load can also be shifted sideways by a transverse skidding system, also operated by controlled hydraulic power packs.

Safe management of the ESET is managed by two advanced PC-Control systems. The primary system, managing the mast lifts from each corner, controls a precision lift rate averaging 3m per hour within a synchronous tolerance of less than 3mm. The second system is Enerpac's Smart Cylinder Control (SCC) control system, which is standard on all strand jack systems and which synchronises the motion of the strand jacks. All power packs and control-systems can be powered by a single 100kW generator.

For the installation of the ESET four lift-containers are positioned at ground level, one for each mast. Inside each container there is an automatic hydraulic lifting mechanism, which lifts the mast barrels in increments of 900mm.

Octagonal pro. le mast barrels made from S690Q steel provide the systems strength. These are made using robotic technology. Mast stability is achieved from high-strength lightweight bracing system installed once the barrels are extracted above the lift container level.