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1
Content available remote Reliability assessment of a main propulsion engine fuel oil system- what are the failure-prone components?
Islam R., Anantharaman M., Khan F., Garaniya V.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2019
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Vol. 13, no. 2
415--420
EN
The main propulsion engine is the heart of a vessel which carries the entire load of the ship and propels to move ahead. The main engine consists of various sub-systems, the fuel oil system is the most important one. Fuel oil system provides fuel to the engine via a fuel injector mounted on the engine cylinder head. During the voyage, the main engine of a ship encounters a variation in loads and stresses due to rough weather to harsh manoeuvring, which sometimes leads to the breakdown of the main engine. Fuel oil systems are identified as one of the main reasons for engine breakdown. Many accidents happened due to the failure of the main engine fuel oil system in the last two decades. To ensure safe and reliable main propulsion engine operation, it is required to assess the reliability of a fuel oil system. However, there is a significant lack of appropriate data to develop the reliability assessment techniques for fuel oil system. This study proposes appropriate data collection and analysis procedure for the reliability assessment of a fuel oil system. Data related to Failure Running Hours (FRH) of a fuel oil system is collected from 101 experienced marine engineers through a questionnaire. The collected data processed using a box plot and analysed for a normality test. It helps to identify the generalization of the data. Moreover, this study identified failure-prone components of a fuel oil system. The collected data will help in developing reliability assessment techniques for accurate reliability analysis of a fuel oil system. The identified failure-prone components will assist in future reliability analysis and risk mitigation strategies for improving the overall safety and reliability of the shipping industry.
2
Content available Reliability Assessment of Main Engine Subsystems Considering Turbocharger Failure as a Case Study
Anantharaman M., Khan F., Garaniya V., Lewarn B.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2018
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Vol. 12, no. 2
271--276
EN
Safe operation of a merchant vessel is dependent on the reliability of the vessel’s main propulsion engine. Reliability of the main propulsion engine is interdependent on the reliability of several subsystems including lubricating oil system, fuel oil system, cooling water system and scavenge air system. Turbochargers form part of the scavenge sub system and play a vital role in the operation of the main engine. Failure of turbochargers can lead to disastrous consequences and immobilisation of the main engine. Hence due consideration need to be given to the reliability assessment of the scavenge system while assessing the reliability of the main engine. This paper presents integration of Markov model (for constant failure components) and Weibull failure model (for wearing out components) to estimate the reliability of the main propulsion engine. This integrated model will provide more realistic and practical analysis. It will serve as a useful tool to estimate the reliability of the vessel’s main propulsion engine and make efficient and effective maintenance decisions. A case study of turbocharger failure and its impact on the main engine is also discussed.
3
Content available Evaluation of the Possibility of Using Hybrid Electric-Propulsion Systems for Inland Barges
Łebkowski A.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2018
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Vol. 12, no. 2
261--269
EN
The paper presents issues related to the possibility of using an electric propulsion system for inland craft, in this particular case self-propelled barges. Perspectives for development of inland water transport in Poland are presented. Historical engineering designs used in water transport at the turn of the 19th and 20th centuries are shown. The current status of stock used in inland navigation along with the condition of waterways available in Poland is presented. Energy consumption by inland craft using various configurations of propulsion systems is discussed, along with comparison of energy consumption during transport of goods using road transport, rail transport and inland waterway transport. In addition to the hybrid electric and diesel propulsion systems, the alternative is to use the electric rail mules for moving the barges.
4
Content available Comparison of the Calculated Wind Loads to the Power Generated by the Main Propulsion and Thrusters of the Ship with the Results of Simulation Tests
Formela K.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2018
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Vol. 12, no. 2
315--319
EN
One of the main factors affecting the safe port maneuvers by ships is wind, which directly affects the ship's movement. The article presents a comparison of calculated wind loads to the power generated by thrusters and the main propulsion of the ship with the results of simulation tests in order to determine the safe wind force limits allowing safe port maneuvers with a particular ship model.
5
Content available Method for determination of energy demand for main propulsion and onboard electric power for modern harbour tug boats by means of statistics
Górski Z., Giernalczyk M.
Journal of KONES
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2012
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Vol. 19, No. 1
147-154
EN
The paper presents the method of preliminary estimation of harbour tugs main propulsion power and on board electric power station based on statistical analysis. At the beginning of paper, the classification of tug boats is executed. Tug boats are classified according to their type of service, type of main propulsion, equipment and way of service. For harbour and roadstead tug boats, the analysis of main propulsion plants and on board power station is executed. Pushing and tractor propulsion plants are presented in which different types of thrusters i.e. azimuth, cycloid and classic propellers are analysed. Advantages and defects of each type of main propulsion are pointed. Statistic methods of analysis are elaborated in Department of Marine Propulsion Plants of Gdynia Maritime University. These methods make possible in simple and quick way to estimate parameters of ship energetic system. The estimation is carried out with good correlation coefficient and high determination of regression coefficient. Statistic methods make also possible to forecast energetic systems parameters for ships to be built in the future. Dependencies for main propulsion power and electric power of onboard power station are not universal for all types of ships. They should be elaborated separately for each type of ships. In this paper, the results concerning only harbour and roadstead tug boats are presented.
6
Content available Energy efficiency design index of container vessel - operational approach
Borkowski T., Kasyk L., Kowalak P.
Journal of KONES
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2012
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Vol. 19, No. 4
93-100
EN
The ship "Energy Efficiency Design Index (EEDI)" has been formulated by the IMO Marine Environment Protection Committee (MEPC) as a measure of the CO2 emission performance of ships. The ship EEDI is calculated based on characteristics of the ship at build, incorporating parameters including ship capacity, engine power and fuel consumption. Shipping is responsible for CO2 discharge of approximately 3.3% global emission and despite being an energy-efficient transport means, compared with other transport modes, there are opportunities for increasing energy efficiency. The EEDI requires a minimum energy efficiency level (CO2 emissions) per capacity mile (e.g. tonne mile) for different ship type and size sectors. With the level being tightened over time, the EEDI will stimulate continued technical development of all the components influencing the energy efficiency of a ship. The paper presents an overview of EEDI calculation method for container vessels and results of experimental approach. The experimental process results through comprehensive analysis of operational data, from modern container vessel, equipped with direct main propulsion unit have been introduced. Ship operators have already been implementing energy efficiency operational measures and set goals for reducing the energy consumption of their fleet. Performance and savings are not always monitored and reported. However, it can be foreseen that such activity when is successfully promoted, reduction of CO2 emissions can be achieved.
7
Content available Assessment of ship's engine effective power, fuel consumption and emission using the vessel speed
Borkowski T., Kasyk L., Kowalak P.
Journal of KONES
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2011
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Vol. 18, No. 2
31-39
EN
Currently, the Baltic Sea States suggests a proposal to designate the Baltic Sea as an Emission Control Area for nitrogen oxides, in accordance with Annex VI of MARPOL73/78. The emission would be estimated on the data produced by the AIS (Automatic Identification System) system that is compulsory for ships. Therefore, exhaust emission of the ships' can be computed using the actual speed and main propulsion shaft power. Mostly, main propulsion engines' exhaust emission is dependent to realistic performance and can be determined. The research plan has been prepared, aimed an evaluating the main propulsion engine performance and emissions. In cooperation with the ship owner, the experimental program onboard the container vessel, equipped with latest large bore, two-stroke, and slow speed MAN B&W electronic controlled engine was carried out. The records set of vessel speed and related engine shaft power, fuel consumption and exhaust emission for container vessel is formed. Taking into account; main engine performance, types of fuel and other input data, the emission factors were determined for ship sea service state. Main engine shaft power estimation and measurement setup, examples of main engine shaft power, the shaft power equation coefficients density, example of main engine service operation, fuel oil consumption group, the ship speed estimated form, example of main engine area operation influenced by weather conditions are presented in the paper.
8
Content available Main propulsion of modern cruise liners and main propulsion power estimation
Górski Z., Giernalczyk M.
Journal of KONES
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2010
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Vol. 17, No. 1
155-161
EN
This paper describes development trends of modern cruise liners and their main propulsion plants as well The growing size of such vessels and growing power of propulsion plants is observed in the population. Diesel-electric propulsion plants, combined propulsions plants CO D AG type (diesel and gas turbines) and COGES type (gas turbines and steam turbines) are mostly used on this class ships. In this types of propulsion diesel engines, gas turbines and steam turbines drive generators thus creating central electric power station to supply electric power to main propulsion electric motors and to ship electric network as well. Medium speed diesel gear type main propulsions are used on older cruise liners only. The paper presents the method of preliminary estimation of ship energetic system parameters i. e. main propulsion power, onboard electric power station power and auxiliary boilers capacity. The method is based on statistic analysis of cruise liners being in service and under construction. Statistic methods are elaborated in Department of Marine Propulsion Plants of Gdynia Maritime University. These methods make possible in simple and quick way to estimate parameters of ship energetic system. The estimation is carried out with good correlation coefficient and high coefficient ofregression determination. Statistic methods make also possible to forecast energetic systems parameters for ships to be built in the future.
9
Content available Metoda określania zapotrzebowania energii do napędu statku, energii elektrycznej i wydajności kotłów dla nowoczesnych statków pasażerskich przy wykorzystaniu metod statystycznych
Giernalczyk M., Górski Z.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2008
|
nr 14 (86)
9-13
PL
W artykule przedstawiono oryginalną metodę określania zapotrzebowania energii do napędu statku, energii elektrycznej oraz wydajności kotłów dla nowoczesnych statków pasażerskich, na etapie wstępnego projektowania statku przy wykorzystaniu metod statystycznych.
EN
The article presents an original method of determining energy demand for ship propulsion, electrical power and boiler capacity for modern cruise liners at the preliminary stage of ship designing by means of statistic methods of calculations.
10
Content available Metoda określania zapotrzebowania energii do napędu statku, energii elektrycznej i wydajności kotłów dla nowoczesnych zbiornikowców do przewozu ropy naftowej i jej produktów przy wykorzystaniu metod statystycznych
Giernalczyk M., Górski Z.
Zeszyty Naukowe / Akademia Morska w Szczecinie
|
2006
|
nr 10 (82)
183-192
PL
W artykule przedstawiono oryginalną metodę określania zapotrzebowania energii do napędu statku, energii elektrycznej oraz wydajności kotłów dla nowoczesnych zbiornikowców do przewozu ropy naftowej i jej produktów, na etapie wstępnego projektowania statku, przy wykorzystaniu metod statystycznych.
EN
This article presents a method of estimating main propulsion power, electrical power and boiler capacities of modern crude oil and products tankers using statistic methods of calculations.
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