Each Pelamis machine is made up of a number of similar sections, each of which contains an identical joint assembly and power take off equipment.
The modular design of the machine allows Pelamis Wave Power to maximise build efficiency and allows for easy transition to significant production volumes.
Pelamis machines are an assembly of ‘off the shelf’ proven technology. This use of existing technology widens the supply chain options and increases component reliability. Pelamis Wave Power chooses suppliers and manufactures who work to the highest quality, safety and sustainability practices. We are committed to developing strong relationships with both new and existing suppliers to share and develop knowledge. If your company is interested in supplying Pelamis please contact us.
The key stages of manufacturing are:
Sub assembly of major power take-off components
Hydraulic cylinders, motors, generators, reservoirs, accumulators and associated piping and wiring are assembled and commissioned.
A key difference between the P2 and earlier designs is that the ‘power modules’ are assembled on an open frame before posting into the tube sections. This minimises costs and speeds up manufacture.
Photo above: Pelamis engineers assemble the motor generator sets.
Structural steel tube and power module fabrication
Tube fabrication can be carried out close to the site of the project to minimise transport costs.
Photo above: Steel cans are welded together to form longer tubes at Pelamis Wave Power’s facility in Leith – photo by Rob McDougall, courtesy of ScottishPower Renewables.
Tube assembly and painting
The power modules are joined to the tubes and installation of the sub-assemblies and wiring is completed.
Photo above: the larger diameter power module is welded to the rear of a tube – photo by Mike Roper courtesy of EMEC.
The tubes are currently individually lifted into the water prior to mating the joints. In future, a slipway could be used to cheaply and quickly launch fully assembled machines or individual sections.
Photo above: A tube section (with integrated power module) is lifted into the water.
Tubes are joined together, bearing attachments are made and cable transits completed. Once in the water the machines are ballasted to the desired level of submergence. Over half the machine’s final weight is ballast.
The machine is then commissioned at the quayside before being towed to the project site.
Photo above: the first P2 Pelamis machine, owned by E.ON, arrives in Orkney.