Feature 2 | FINLAND’S MARINE INDUSTRIES Eniram trims fuel costs
Having entered the ship performance optimisation, emissions control, and safety and comfort market in 2005, Finnish company Eniram says its Dynamic Trimming Assistant is the fastest growing product of its type in the market.
currently have 34 employees consisting of marine system experts, soſtware architects, programmers, naval architects and captains, but we are about to hire more.” Eniram has an office in Ft. Lauderdale, to handle the local cruise industry, and is in the process of establishing a sales office in Shanghai. The company’s Dynamic Trimming
“
Assistant provides a tool for ships officers to optimise vessel trim for minimum fuel consumption. Te PC-based system automatically gathers all necessary data from the various onboard vessel management applications, based on which the ship’s optimal trim for each real operating condition is processed, using a soſtware program developed for the purpose. Te company provides the attitude (trim) sensors, with one unit placed forward and one aſt to compensate for errors caused by hogging or sagging. The data gathered includes trim, list, draught, propulsion power, vessel speed over water and over ground, water depth, course and wind speed and direction, as well as all tank data and engine automation data. Te data is measured 25 times per second and is then pre-processed by the onboard server. The optimal trim is displayed in the
wheelhouse on a 15 inch touch screen with three displays allowing timely action in the changing operating conditions of the vessel. Te main screen shows the ship’s current trim and its optimal trim. If the current trim is on the red area, at least 5% in fuel consumption can be gained by correction; if in the yellow area, fuel consumption can still be optimised by correcting the trim. Te second screen shows trim and list in more detail. Te third screen provides more details, showing used propulsion power, the saving potential and a possibility to follow the trim and optimal trim on a scalable continuous basis.
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Eniram has grown very fast,” said Eero Lehtovaara, captain and manager of marine operations at Eniram. “We
The main screen displayed in Eniram’s Dynamic Trimming Assistant (DTA) If in the red area, at least 5% in fuel consumption can be saved by correcting the trim.
and merchant vessels have demonstrated significant savings on fuel costs and emissions,” he said. “On average, the vessels with the DTA installed have saved more that two percent in fuel consumption, some even more. When looking at the longterm statistics data of DTA we can also clearly see the effect of the hull condition, before and aſter a drydocking, on fuel consumption. Cutting fuel consumption by up to 5% leads to potential annual savings of hundreds of thousands of Euros per vessel. In addition to saving costs, reduced fuel consumption has a direct effect on emission levels. A saving of 20tonnes of fuel per week, for example, can result in an annual emission reduction of 3000tonnes of CO2
, 40tonnes of NOx and
30tonnes of SOx.” Te system is set up through a calibration
The third screen provides more details with used propulsion power and saving potential and a possibility to follow the trim and optimal trim on a scalable continuous basis.
Mr Lehtovaara noted that the vertical
position of the bulb of the vessel is very important for low resistance, as is the vertical position of the typical duck tail stern. Placed too high it can result in cavitation, and placed too low, the much disturbed water flow increases resistance. When a ship with a wide stern turns, the resulting list can cause one end to dip too low and thus increase the ship’s resistance too much. Mr Lehtovaara said that there were other factors affecting the trim and resistance; such as tank operation during the voyage, squat, the hull form itself at different speeds through water, weather conditions and selected course. “Te first installations of the DTA system in cruise
period and executed under different operating conditions, varying the speed and trim of the ship. The resulting data parameters are then mapped out in a “drag area” through multi-dimensional non-linear regression analysis. Te optimal trim data is then easily found for the range of input data provided. As the DTA constantly measures the dynamic trim of the vessel and processes all available and relevant machinery and navigation data, a self-learning function provides continuously improved accuracy over time, which can be included through soſtware updates. “Te system can be installed in four to
six weeks, regardless of whether the vessel is under construction or already in operation,” Mr Lehtovaara said. Te first installations were done last spring, aſter a successful testing period onboard one of Carnival Cruise Lines’ cruiseships. Currently vessels in Carnival Cruise Lines’ and Holland America Lines’ fleets are receiving the system. In October Norwegian Cruise Line also decided to deploy DTA across its entire cruiseship fleet, beginning with Norwegian Jewel. Other vessels with the system include some ferries, ropax vessels and special-purpose vessels. NA
The Naval Architect February 2009
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