Propulsion – Page 77
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NewsTurnkey stern tube assembly speeds installation
An optimised stern tube assembly and improved shaft bearings aim to improve yard installation time.
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NewsCaution required switching to bio-oils for stern tubes
An estimated 4.6 to 28.6 million litres of stern tube lubricant entering the sea each year means that biodegradable oils and water lubrication are likely to figure more definitively on the regulators radar in the near future. Is the technology ready?
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NewsThe implications of ice class on two-stroke ship propulsion
With the increasing interest in opening up the Arctic routes to larger vessels, such as tankers, many of which will be powered by low speed engines, Birger Jacobsen, MAN B&W senior two-stroke research engineer, looks at ice classes and requirements for the machinery of such ships.
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NewsNew Icepod thruster favoured for Caspian and Alaskan operations
Propulsion solutions for navigation in ice have been augmented by Wärtsilä’s development of a steerable, pulling thruster designed to 1A Super Ice Class or higher standards, known as the Icepod. David Tinsley explains.
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NewsUpgrade for popular four-stroke engine
Wärtsilä explains how over the last two years it has been carrying out a test programme of improvements to its 32cm-bore four-stroke engine, to provide claimed best-in-class power density and fuel economy across a broad operating range, with rated power up by 15%.
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Bearing and seal performance improved through use of composite materials
Wärtsilä claims to be the only current supplier able to provide composite technology for both seals and bearings, and as a result can offer longer life, easier maintenance and added customer value in marine applications.
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NewsDual-fuel marine two-strokes attract first orders
MAN Diesel & Turbo recently announced the first order for its low-speed, dual-fuel ME-GI engine, and a few days later shipping company Teekay placed a further order, bringing the number of confirmed engines up to six, plus options.
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NewsTesting times – how water in oil assessment can safeguard operational efficiency
Martin Lucas, business unit manager for Parker Kittiwake warns shipowners about the adverse effects water in oil can have on overall operational efficiency, and how these effects can easily be minimised.
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NewsCompact electric drive for Dutch tourist craft
A Dutch company has developed a new, particularly compact, electric drive propulsion system, writes Dag Pike.
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NewsWater jacket cooling for propulsion and thruster motors
Italian company Marelli Motori describes its range of water-cooled electric motors designed for today’s more efficient and better optimised ships.
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Breakthrough orders for large thrusters
Finnish company Steerprop has recently received orders for its propulsion units for projects in Russia and India.
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NewsHigher speed four-strokes enter OSV marketplace
Traditionally, four-stroke medium speed prime movers have been used to power ships operating in the offshore support sector, either as part of a mechanical propulsion system or, as is increasingly the case, at the heart of a diesel-electric (or gas-electric) power plant.
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NewsCat medium speed power for towboats
Towboats used on the US waterways tend to have particularly long service lives, meaning that repowering is not uncommon as original engines wear out or become obsolete, and the increased efficiency and better economy of newer machinery makes replacement cost-effective.
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NewsDual-fuel four-strokes provide clean alternative
It is not only in the offshore and passenger sectors that gas and dual-fuel four-stroke engines are believed to offer a viable option for future propulsion requirements.
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NewsRo-ro and passenger ships provide four-stroke orders
Alongside the flourishing offshore support ship industry, the ro-ro sector has been picking up some welcome orders, which has been good news for the major four-stroke engine companies.
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NewsSurface drive principles applied to large ships
In recent years, surface drives have been applied almost solely to small, fast, specialist boats, but, as Dag Pike recounts, the concept is being revisited for large vessel propulsion.
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NewsInland waterway tanker produces ‘up to 90% less NOx’
Volvo Penta of Sweden reports that its propulsion and genset engines are used onboard the ‘MTS Duandra’, described as the first semi-hybrid inland waterway tanker.
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NewsFuel saving and low emissions are priorities across the board
All sectors of the maritime market are concentrating on cutting costs and regulatory compliance, and even markets such as naval vessels, largely coming outside MARPOL jurisdiction, are showing a desire to be environmentally responsible.
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NewsComposites make for propeller efficiency
A composite propeller for smaller ships has been launched by UK-based Axiom Propellers. The Axiom propeller’s composite construction is design primarily to save fuel and increase efficiency, through its light weight and optimised blade profile.
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NewsNiigata adds new gas-burning designs to its range
Augmenting a remarkably broad portfolio of machinery for both marine applications and stationary power generation plant, Niigata Power Systems has developed two new, medium-speed gas-burning engines in the spark ignition (SI) and dual fuel (DF) categories respectively, which are described by David Tinsley.
