Integrated solutions

Scana Volda develops and delivers propulsion systems to a wide range of ship types and sizes. In order to solve the different working conditions we deliver tailor-made flexible solutions to execute all tasks efficiently. The total operating system is optimised to the ship’s actual service profile.

CP-propeller, gear boxes and remote control systems in one single delivery from Scana Volda has for years proven to be profitable in both practical and economical terms.

Packaging power prevents problems
The british magasine Marine Propulsion & Auxiliary Machinery published an article on how single-source supply of integrated propulsion systems yields significant benefits for ship designers, builders and operators in planning, installing and commissioning project. Further on the article described how 'unknown or contradictory component and package main dimensions, for example, might result in inadequate space reservation for the shaft alternator; a ‘collision’ between gearbox and engine charge air receiver; and an unsuitable compromise between the total machinery installation and engineroom lengths. An integrated package designed and supplied from a single source, however, enables a shipyard to concentrate on its core competence (steel fabrication and project co-ordination) and allow a specialist supplier to take responsibility for designing, delivering and commissioning an optimised propulsion plant.'

Taken from: Marine Propulsion & Auxiliary Machinery February/March 2009: Article 'Packaging power prevents problems'

Hybrid solutions

High power when needed, low power with significantly less fuel consumption when not.
The Scana Volda hybrid solutions reflect in full the way we think and work to achieve premium performance with a broader view.

Originally designed for offshore vessels, the hybrids is relevant for all vessels that, for the most part, have a variable and very low power requirement yet require a high constant power at other times.

Hybrid propulsion system with frequency converter
This is a combination of electric drive and diesel drive of the propeller. This system can be used in different ways;

• Electric drive at variable rpm
• Diesel drive at rpm fixed
• Both engines simultaneously with fixed rpm or some rpm variation.   

Gives possibility to run at optimum rpm in the lower power range. This system configuration gives high propeller efficiency to ship types that most of the time have a variable and very low power requirement and at other times require a high constant power.

Advanced hybrid propulsion system
This system allows a great variation in operation modes, diesel, electric, combined diesel + electric. 

For example:
• The outer diesel on each side can be used as power source for electric propulsion of each propeller.
• Max power mode by using all four diesel engines + electric boost via PTI with power from auxiliary generator sets.

Conventional solutions

A diesel engine is running the propeller via a reduction gearbox with or without a PTO.

A system at a reasonable price level with a simplistic solution suitable to all ship types with a narrow service profile. Typical ships are cargo, tankers, ferries and pine trawlers.

• Diesel mechanical propulsion system with PTO
• Twin screw diesel mechanical propulsion system with PTO

Twin engine

In a twin screw /4 engine configuration, the power flexibility is very large. By using one, two, three or four engines at the point of minimum specific fuel consumption, the average efficiency is good. The redundancy is also very good in such arrangements.

• Twin-in single-out diesel mechanical propulsion system
• Twin-in single-out "father and son" diesel mechanical propulsion system with PTO

Diesel electric propulsion system
with frequency converter

The propeller is driven by one or more electric motors via a reduction gearbox. The power is delivered from the ship’s electric supply system. The system gives a very flexible and good solution to ships with a wide variety range in propulsion power.

Typical ships for this solution are longliners, combined trawlers/purse seiners, standby vessels, patrol vessels, icebreakers, seismic vessels, anchor handling vessels and different support vessels.

The most effective solution is achieved by a variable rpm at one or more of the electric engines, to ensure the propeller optimised working conditions in the entire power range.