waterjets
Crewboats extend waterjet references
producing waterjets since 1954 is applied by New Zealand-based HamiltonJet in refining a portfolio which currently includes designs
E for power inputs from 150kW to
3,000kW for vessels up to 60m long. The HJ series of smaller jets, embracing eight
models with impeller diameters from 200mm to 400mm, are typically suitable for vessels of 6-20m in length; larger applications are served by the HM series, whose seven models with impeller diameters from 420mm to 810mm generally address 18-60m craft with two or more engines. Fast offshore crewboats have traditionally provided business for HamiltonJet, its references extended last year by the delivery of the 58m-long catamarans Seacor Lynx and Seacor Leopard from the Gulf Craft yard, the third and fourth of Seacor Marine’s CrewZer class. A service speed of 40 knots on a deadweight of over 120 tonnes and a maximum speed of 42 knots is secured by a propulsion plant based on four V16-cylinder MTU Series 4000 M73L engines, each driving an HT-810 waterjet.
Due for delivery in May is the first of two
54m-long fast support vessels for Seacor Marine from the Neuville Boat Works in Louisiana; seating for up to 83 passengers is provided along with cargo tankage and a deck freight capacity of 196 tonnes. Four Cummins QSK50-M engines,
each
developing 1,325kW at 1,800 rpm, will drive Hamilton HT811 waterjets via Twin Disc gearboxes with a reduction ratio of 2.58:1. Speeds up to 30 knots are promised from the quadruple-jet installation.
xperience gained in designing and
Now building at Incat Tasmania is the world’s largest waterjet-propelled high speed crewboat, heading a 70m-long class for operations in the Caspian Sea. Space is arranged for 150 passengers and 14 crew, along with 200 tonnes of deck cargo. The semi-SWATH vessel – also HamiltonJet’s largest reference to date – will be powered by four 2,880kW MTU engines driving 900mm-diameter HT900 jets. A maximum speed of 36 knots and an efficient service speed of 30 knots at full load and 90 per cent mcr will reportedly make the craft more cost-effective to deploy than helicopter transfer of crew and cargo. Four control stations will each exploit HamiltonJet’s Modular Electronic Control System, integrated with DNV Dynpos-AUTR dynamic positioning. The waterjets are said to work particularly well in DP-capable craft, where the powerful 360-degree thrust forces generated by the jet’s split duct reverse deflector at any vessel speed effectively act as an azimuth thruster. The effect of the waterjet’s manoeuvring thrust
is further enhanced by the wide spacing of the jet units in a catamaran configuration – two jets per hull – which yields even better control of the stern and can even assist with sideways movement of the bow. This low speed manoeuvrability boost has helped its waterjets secure dominance in the fast crewboat arena, HamiltonJet asserts. Hitherto the largest vessel to be specified with HamiltonJet units, the 68.5m-long Gulf Craft-built monohull crewboat Ms Netty, also designed by Incat Crowther, features quadruple HT900 jets for a maximum speed of 32 knots. HamiltonJet’s largest waterjet model, the
HT1000, has yet to be specified for a crewboat but has reportedly proven its worth in patrol boat propulsion. The company is confident of sustaining business as crewboat designs develop further in size. Fast offshore supply vessel propulsion is also targeted by Swedish specialist Marine Jet Power, whose recent projects included quadruple-MJP 650 CSU waterjet outfits for a pair of 53m-long FSVs ordered by Rodi Marine Services from Swiftships Shipbuilders. The 31-knot vessels are scheduled for service with the Louisiana-based operator in first-half 2014. Marine Jet Power offers a full line of stainless steel and aluminium jets with mixed or axial flow pump technologies, absorbing engine power inputs from 112kW to 15MW with intake diameters from 250mm to 1,550mm. Single-, twin-, triple- and quadruple-sets cover a wide range of vessel demands.
Among current commitments are twin-MJP DRB 400 jet systems for a series of 19m-long aluminium-hulled patrol
by a south east Asia government
boats commissioned from Lung
Final assembly of a HamiltonJet HT900 waterjet 76 I Marine Propulsion I April/May 2014
Teh Shipbuilding in Taiwan. The first is due for handover early next year. Driven by 1,215kW MAN high speed engines, the jets are expected to achieve a vessel speed of around 50 knots. Waterjet propulsion – valued for shallow draught operations – will also facilitate a beaching capability. Medium-size DRB series jets are described as of heavy duty design, fostering low maintenance and high reliability, while their high efficiency mixed flow pumps deliver a high maximum speed and low fuel consumption. Lung Teh’s order backlog includes a 60m missile catamaran for the Taiwan Navy which will be equipped with quadruple MJP CSU 850 waterjets. CSU jets are larger, mixed flow, all- stainless steel units backed by a five-year warranty. Last October Marine Jet Power was selected as the preferred waterjet supplier for the South Korean Navy’s multi-vessel gas turbine-powered PKX-B patrol boat project; it earlier partnered a Korean company in securing contracts to supply other Navy and Coastguard programmes. The latest project will enable MJP to enhance its local manufacturing and service capabilities in South Korea. Marine Jet Power’s thrust in the smaller waterjet arena was strengthened in 2012 by acquiring the relevant interests of the UK/USA- based Ultra Dynamics, adding the popular Ultrajet aluminium axial flow series to its programme. MP
www.mpropulsion.com
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