Enerpac, Menomonee Falls, Wis., supplied high-pressure, hydraulic cylinder technology for the topsides lift system beams on vessels. The cylinders are an integral part of the vessel’s lift system, enabling the installation and decommissioning of complete topsides weighing up to 48,000 metric tons.
The “Pioneering Spirit” vessel, for example, is said to be the world's largest platform installation/decommissioning and pipelay vessel. Its 16 lifting beams feature 64 Enerpac CLRG-Series high tonnage double-acting hydraulic cylinders arranged in groups of four, designed specifically for heavy lifting up to 1,000 metric tons.
The double-acting cylinders provide very high levels of precision and control, enabling the vessel to use the fast lift method. During installation and decommissioning, the lifting beams are extended, allowing platform topsides to be lifted several feet.
To ensure trouble-free operation offshore, the Enerpac hydraulic cylinders have higher than normal levels of corrosion resistance. For example, the parts were first subjected to NiCr80/20 plasma spray, then with an AlTi plasma spray. Two layers of special coating to close the pores of the steel followed. The final baked enamel finish and plated pistons for each cylinder are compliant with the NORSOK M-501 standard for surface preparation and protective coating.