Offshore & Marine

OFFSHORE & MARINE

Marine and offshore application mainly refers to engineering vessel operations at sea and engaged in the transportation, loading and unloading port equipment, mainly including the ship with a crane, drilling platform, wind power installation platform, dredger, piling barge stacker, reclaimer, ship unloader, loading machine, gantry crane, bridge crane etc.

Knuckle Boom Crane Cylinders

Safe, lifting and handling of goods on drill ships and other offshore rigs. With this solution of knuckle boom cranes the risk of swinging loads especially under rough weather conditions will become minimized. The lifted loads are under permanent hydraulic control. Special load control valves directly mounted on the cylinders guarantee that there are no uncontrolled movements of main boom or knuckle boom arms. Typical knuckle boom crane is operated with four cylinders in total: two knuckle boom cylinders and two main boom cylinders.

  • Different corrosion resistant rod coatings are available, exactly adjusted to the application in question (Ni/Cr layer, thermic sprayed Carbides and Oxides or Ultraplate coating)
  • Cylinder components, critical regarding corrosion, are special treated to optimize corrosion resistance
  • Stainless steel piping and manifold block for safety and load control function
  • Equipped with wear resistant Hunger seal and bearing elements for low wear and friction and stick-slip free crane movement
  • Cylinders designed for high working pressure over 400 bar

N- line tensioner cylinders

The modern N- line tensioner design is used to ensure a pre-defined tension to the marine riser and to compensate any rig motions like heave, roll or pitch. The system consist of accumulator loaded, long stroke hydraulic cylinders, which are directly mounted between the drill rig structure on one side and the tension ring on the other side.

Because N- line tensioner cylinders are installed directly in the splash zone with partly submerged piston rods an excellent corrosion protection is necessary. The Ultraplate coating guarantees premium corrosion protection as well as high wear resistance for the continuously moving rods. Merkel seal and guiding elements are used to provide long life properties. Other special features are an externally adjustable seal which can improve the reliability of the whole system, an absolute position measuring system, special ball joints allowing a tilt movement in any direction and the Nitrogen loaded accumulators with rupture disc and temperature safety valve.

Wire line tensioner cylinders

A wire line tensioner system is used to ensure a pre-defined tension to the marine riser and to compensate any rig motions like heave, roll or pitch. An accumulator loaded hydraulic cylinder generates the tension in a pulley system which is connected to the drill rig structure on one side and to the tension ring on the other side.

Because the hydraulic cylinders are installed on the platform deck free access for service and maintenance is given. To protect the piston rod against corrosion, Nickel-Chrome layers or thermical sprayed coatings are used. Merkel  seal and guiding elements are used to provide long life properties. The cylinders can be delivered with mounted accumulators and piping. Certification according to DNV lifting appliances 2008, DNV standard for certification No. 2.9 hydraulic cylinders and DNV offshore standard E101/D101 or alternatively according to ABS rules for building and classing, steel vessel. Part 4, Lloyds register, GL or Bureau Veritas.

Piling barge cylinders

Piling barge cylinders are used for operating ram-cranes on working barges. With these barges, concrete-steel pillars with lengths up to 100 m get rammed in the sea ground used for construction of bridges, quay walls or harbour walls. By the bi-directional working cylinder the mast can be adjusted to different angles to get higher stiffness from the lightly crossed pillars.

The cylinders are certificated according to CCS standard or DNV lifting appliances 2008, DNV standard for certification No. 2.9- hydraulic cylinders. Main features of the cylinders are the Ceraplate rod coating, stainless steel spherical bearing, offshore plastic compound bushings at rod end for automatic locking function and friction and wear optimized Hunger seal and bearing elements. The cylinders are equipped with manifold block providing all safety and load control functions.