Italian Hybrid OSV

By Keith Henderson at March 06, 2012 07:45
Filed Under: Company News

Italian shipyard Cantieri Navali Megaride is currently constructing an offshore supply vessel (OSV) in their Naples facility for the Guardia Costiera (Italian Coastguards). They have commissioned Siemens Marine Solutions to equip the ship with a hybrid propulsion system.

Caption: A RINA 65 m Offshore Supply Vessel (OSV) with hybrid
propulsion system for the Italian Coastguards .
Image credit: Errenavi Rome / Siemens AG

The duty cycle of this type of vessel involves long periods of standing-by, maneuvering, (dynamic) positioning and other slow speed tasks which are ideally met with low power electric propulsion. Less frequent transit and pulling tasks do require considerable power for which main diesel engines are required. A duty cycle like this is an ideal candidate for hybrid propulsion.

The vessel has a LOA of 65 m and beam of 12 m, and is designed by Errenavi, Rome to RINA classification society rules. It features a CODLOD* hybrid propulsion system provided by Siemens Siship EcoProp, offering full diesel mechanical power or alternatively approximately10 per cent of full power with a diesel electric drive. The speed of the vessel in diesel mode is approximately 12 kn and on electric power up to 8 kn.

A two shaft propulsion arrangement uses fixed pitch propellers and comprises two Caterpillar 3512C main diesel engines of 1,765 kW at 1,800 rpm each driving a ZF 9300 PTI ‘hybrid-ready’ transmission and two Siemens electric motors rated at 180 kW at 3,000 rpm. This type of transmission has a PTO/PTI that can also accept input power through the PTI to which an electric motor is attached. In this particular case the PTI includes a spur gear to act as a ratio multiplier. On board electrical power for hotel and electric propulsion is supplied by four Caterpillar C18 gensets each of 275 kW output, thereby allowing electric propulsion with the main engines shut down.

*(Combined Operation Diesel eLectric Or Diesel)

Caption: A ZF 9300 PTI ‘hybrid-ready’ marine transmission with spur gear
PTI is suitable for engines with powers up to 3,700 kW at 2,100 rpm
Image credit: ZF Friedrichshafen AG

Comments (1) -

The combined power plant is a very good propulsion system for OSV. Kindly send the general arrangement and engine room layout to give it to my graduate students as an excellent example.

Dr. Adel Tawfik |     3/17/2012 3:06:06 AM #

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