Alewijnse has finished the electrical conversion on board the heavy lift crane vessel Jumbo Javelin. For this conversion, the company engineered, manufactured and delivered several new switchboards and modified systems for power management and alarm monitoring.

The new switchboards will manage the additional power provided by six temporary containerised generator sets. Jumbo has had these installed to increase the vessel’s capacity for a new offshore wind installation project in Taiwan. The six generator sets have been fitted to supply power to the vessel’s bow thrusters and offshore equipment during DP operations. The switchboards will manage this increased power supply.

Ad van de Langeraad, Fleet Manager at Jumbo, says: ‘For an upcoming offshore wind farm installation in Taiwan we needed an upgrade of the capability plot of our DP installation. We needed additional power for the bow-thrusters to get DP capability up to the required level. To make this happen, we contacted Alewijnse. They did the complete electrical installation when the Jumbo Javelin was built, as well as the conversion to DP2 in 2005.’

‘Our switchboards have made it possible for the Jumbo Javelin to have a fully separated power supply for the two bow thrusters,’ explains Alewijnse’s Manager Service Ben Bonte. ‘In the previous set-up, there was not enough power available for the temporary equipment. The upgraded configuration gives Jumbo the extra capacity and reliability to take on the new project.’

Future flexibility

Alewijnse has managed the complete integration of the new switchboards into Jumbo Javelin’s existing systems. Furthermore, the company installed the switchboards in such a way as to allow the ship’s electrical systems to return to their previous settings after the removal of the temporary generators. This has been achieved through modifications to the power management system (PMS) and programmable logic controller (PLC) control systems.

The new switchboards will, however, remain in position, giving Jumbo the option to increase the vessel’s power capacity again in the future.

Covid-19 impact

The project has faced additional challenges as a result of the coronavirus crisis. Bonte explains: ‘Because of the Covid-19 measures we were not allowed to board the vessel for installation and commissioning works. We solved this by outsourcing the work to local staff in Singapore, while we coordinated the work preparation and supervision from the Alewijnse office in the Netherlands. Thanks to the close cooperation between the client, other subcontractors, local partners and the remote assistance of Alewijnse, we have succeeded in this.’

‘You can imagine that mobilising an offshore construction vessel during the Covid-19 lockdown is not easy, but we managed it,’ adds Van de Langeraad. After the modification, we held a successful DP trial, including an FMEA (Failure Mode and Effects Analysis Ed.). With this job, Alewijnse showed that they are flexible and can handle a job like this using local staff in Singapore and their remote access capability.’

Jumbo Javelin

The Jumbo Javelin is a dynamically-positioned, heavy lift crane vessel operated by heavy lift shipping and offshore installation contractor Jumbo. The 144-metre vessel is currently mobilising and will soon be handling the transportation and installation of wind turbine generator (WTG) structures at the Yunlin Offshore Wind Farm. When completed, this will be Taiwan’s first large multi-megawatt offshore wind project.