propulsion packages
optimisation of the system as well as project management in co-ordinating the technical interface between propulsion system elements. MAN Diesel & Turbo Frederikshavn plans to continue promoting the propulsion concept to Chinese licensees and local interests with the aim of strengthening the group’s propeller market share. Other delivery references in recent years have included propulsion packages for three large Peruvian purse seiners. Built at the SIMACH yard in Peru for a local operator, the 78m-long x 11m-wide vessels were intended mainly for anchovy fishing (for fishmeal production) and mackerel and horse mackerel fishing. The MAN-supplied installations for each vessel are based on a six-cylinder L21/31 medium speed engine (1,290kW at 1,000 rpm) driving a 3.1m-diameter high-skew MAN Alpha VBS 740-ODG CP propeller. An MAN Alpha AMG 60VO28EV gearbox with a reduction ratio of 6:1 lowers the shaft speed to 167 rpm for a ship speed of 14 knots. The plant is controlled by an MAN Alphatronic 2000 propulsion management system. Among current projects, full propulsion
packages based on eight-cylinder MAN L27/38- VBS medium speed engines are being supplied by MAN Diesel & Turbo for a pair of anchor handling/ tug/supply vessels under construction at Topaz/ Adyard in the Middle East. The installations will deliver a bollard pull of 80 tons. A prestigious reference for Wärtsilä will see the supply of a dual-fuel medium speed engine package for Viking Line’s large LNG-burning Baltic ropax cruiseferry under construction at the STX Turku yard in Finland for handover next year. The 57,000gt/2,800-passenger vessel with stowage space for cars, trucks and trailers will serve between Turku in Finland and Stockholm. An option is held for a sistership. A maximum speed close to 23 knots
is
anticipated from a twin-screw propulsion plant based on four Wärtsilä eight-cylinder L50DF engines geared in pairs to stainless steel fixed pitch propellers via shaftlines with environmentally friendly seal systems. The Finnish group will additionally provide bow and stern tunnel thrusters for manoeuvring. The scope of Wärtsilä’s supply will include its onboard LNGPac system for bunkering, storage (in two tanks) and handling liquefied natural gas, along with associated safety and automation systems.
Propulsion systems based on low speed
main engines will be supplied by Wärtsilä for six 26,000 dwt roro/general cargo/container ships building for the National Shipping Co of Saudi Arabia at Hyundai’s Mipo yard in Korea. The vessels are due for delivery in 2013-2014 for operation by NSCSA subsidiary Mideast Ship Management. Each integrated package will be based on
74 I Marine Propulsion I February/March 2012
A ZF Marine/Siemens package will serve an Italian Coast Guard offshore supply vessel
a Wärtsilä RT-flex58TD two-stroke engine and a CP propeller. The flexible settings of the 580mm-bore electronically-controlled engine design enable lower minimum running speeds and foster reduced fuel consumption across the operating range.
Fuel economy will be further enhanced by integrating the propeller and rudder within an Energopac system; such configurations are designed by Wärtsilä for the individual project to optimise fuel savings without compromising manoeuvrability or comfort levels.
Integrated power and propulsion systems and equipment from Rolls-Royce are commonly supplied for offshore vessel projects, the UK-based group often providing the overall ship design as well. Its latest commitments will include supporting the construction of two Rolls-Royce-designed UT 717 CD platform supply vessels, with options for another four. The PSVs will be fitted out for Island Offshore at the STX yard in Brevik, Norway, for delivery in the second half of 2013. The Norwegian owner has a further three UT-design vessels building at the yard, two of which are the first LNG- powered Rolls-Royce offshore vessels. A development of the UT 755 design, but with increased capacity, deadweight (3,750 tons) and deck load (1,800 tonnes), the 84.5m-long x 17m-wide UT 717 CD class will feature an integrated installation based on Rolls-Royce main engines, reduction gearing, CP propellers, bow and stern thrusters, and an automation and control system.
Each propulsion train will be driven by a Bergen
C-series medium speed engine rated for 2,560kW. High manoeuvrability will be yielded by the two Rolls-Royce TT 1850 CP DPN bow thrusters and two TT 1650 CP DPN stern thrusters. Additionally, the group will supply an electrical package, automation system, Poscon control system and Helicon X3 remote controls as well as steering gear and rudders. A bulk handling system and deck machinery outfit (capstans, windlasses and tuggers) are also assigned to Rolls-Royce.
German gearing specialist ZF Marine has extended its portfolio in recent years to enable propulsion packages to be offered for smaller ship projects. Complete systems will be provided for six 50m-long emergency response/rescue vessels ordered by Dutch operator Vroon for service mainly in the UK North Sea arena, providing standby support for offshore platforms.
Designed by Singapore-based Khiam Chuan Marine, the series is building for delivery from end-2012 by the Nanjing Eaststar Shipyard in China. ZF Marine’s Commercial Craft division was
involved in the project from an early
stage, offering various propulsion plant options to vessel designer, builder and operator for meeting the deployment profiles.
The agreed solution features twin engines
driving CP propellers via reduction gearboxes; a frequency converter-driven retractable azimuth bow thruster will act as the main propulsor when the vessel patrols close to offshore platforms. Hybrid propulsion systems are increasingly appreciated by smaller tonnage, a sector targeted by Siemens Marine Solutions working in close co-operation with ZF Marine as gearbox supplier. A current project calls for a Siemens Siship EcoProp hybrid propulsion system for an Errenavi-designed 65m-long offshore supply vessel under construction for the Italian Coast Guard at the Cantieri Navali Megaride yard. Tailored to the needs of the client, the propulsion plant integrates a ZF 9300 PTI (power take-in) ‘hybrid-ready’ transmission and two Siemens electric motors (180kW at 1,800 rpm) matched to a pair of Caterpillar 3512C engines (1,765kW at 1,800 rpm). Propulsion modes are diesel-only – directly through the transmission – or electric-only through the PTI. Vessel speeds of around 12 knots and eight knots are sought respectively in diesel and electric modes. In this application, ZF Marine explains, its 9300 PTI ‘spur gear’ variant acts as a ratio multiplier, keeping the footprint of the unit small and allowing a wide range of ratios for each transmission. MP
www.mpropulsion.com
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