Controls for a Jack-Up Lift Vessel 

Power Management Controls for a Jack-Up Lift Vessel

ComAp Singapore and Gennal Singapore installed and commissioned ComAp marine system on a jack-up lift vessel, a supporting ship for any offshore construction. The ship was assembled in China and is now operating in Persian Gulf. The vessel´s installation features self-propelled diesel electric propulsion system with dynamic positioning.

The entire power system of the vessel consists of eight Caterpillar 1128kVA gen-sets as a primary power source for the ship. The biggest loads of the vessel are four azimuth thrusters, two cranes and jacking system, along with the usual ship’s systems.
 

As the ship operates under difference modes, ComAp’s control system takes care of the complex power management. ComAp controllers manage and protect generators as well as bus-tie operation. As the ship operates mainly on heavy load requests, ComAp system calculates load reserve and send a permissive signal to the operator to run the load.
 

Dynamic Positioning mode requires a separation of the ring bus into separate section and starting request for all available generators. The bus tie breakers are controlled separately with ComAp controllers with bus tie applications.

The entire application does not have a master controller, so in case any of the ComAp controller fails, another controller takes care over control. The system is also fitted with CAN bus redundancy, where the inter-controller communication plays a major role in entire power management. Once any of the CAN wire breaks, another CAN line takes care without any interruption.

The ComAp system provides all the information through Modbus protocols to a local alarm management system and SCADA system. SCADA also commands ComAp system to provides operation modes as well as manual start and stop of the gen-sets. Controllers are fitted with remote display - InteliVision 8 Marine.

The entire site as well as control system is certified under ABS.
 

The system uses Marine certified versions of the following ComAp products:
  • InteliSys NTC BaseBox
  • InteliMains NTC BaseBox
  • Intelivision 8 Marine
  • Internet Bridge NT
  • Inteli-IO8/8
  • I-LB+
  • I-CR-R

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