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Comparison of selected models useful in ranking the root causes of explosions in marine engine crankcases

Wiaterek Daniel, Chybowski Leszek

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2022

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nr 72 (144)

77--85

EN

This article aims to compile, describe and compare three different models taken from the literature describing the causes of explosions in the crankcases of marine engines. Each of the models has a different level of detail and was prepared with a different purpose. However, the same process, explosions in crankcases, was analyzed in all cases. A statistical evaluation of the frequency of events leading to explosions, a model built using failure mode and effects analysis (FMEA) and a model based on fault tree analysis (FTA) are described in turn. The FTA model drawn from the literature formed the basis for further analysis. Values of important measures of all elementary events of the fault tree were calculated using the Birnbaum reliability measure, Vesely-Fussell measure, Birnbaum structural measure, criticality measure and improvement potential. The percentage importance values of all events determined using these importance measures were compared. The results obtained from the application of each model were evaluated. The results of the models were compared with each other, and an approach using all three models supplemented with diversion analysis was proposed.

2

Assessing the topicality of the problem related to the explosion of crankcases in marine main propulsion engines (1972–2018)

Wiaterek Daniel, Chybowski Leszek

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2022

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nr 71 (143)

33--40

EN

The purpose of this paper is to present the results of a query aimed at assessing the validity of the topic of crankcase explosions prevention in the main marine engines. The study takes into account the engine type, engine manufacturer, ship’s age, accident severity, ship’s location at the time of the incident, and the share of fatal accidents in the analyzed population of crankcase explosions. One of the primary hazards associated with offshore and deep-sea ship operations – and primarily ship power plants – are fires and explosions that result in accidents and incidents with an average frequency of 60 days. This paper discusses the actuality of crankcase explosion hazards in the main propulsion engines of various types of sea vessels. The assessment was made based on the results of a statistical analysis of historical data from 1972 to 2018. The methodology consisted of three stages: (1) a selection query to obtain the source data, (2) analysis of the obtained results (data separation, extraction of additional information, and statistical analysis), (3) synthesis of the obtained information, and drawing conclusions about the numerical indicators describing the statistical distribution of individual events for the given evaluation criteria. The analysis showed that the risk of crankcase explosions affects ships of all ages – both in crosshead (31%) and trunk piston engines (61%) – and that the number of serious incidents (67%) remained constant over the investigated period. Half of all incidents occurred on vessels younger than 15 years old. 58% of explosions took place in engines of the most popular prime movers manufacturers. The probability that a main engine crankcase explosion will result in injury or death is 17.34%.

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Podział i charakterystyka koparek jednonaczyniowych

Bodziony Przemysław, Kasztelewicz Zbigniew, Patyk Michał

Kruszywa : produkcja - transport - zastosowanie

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2019

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Nr 2

44--49

PL

Koparki jednonaczyniowe stanowią jeden z najważniejszych typoszeregów maszyn stosowanych w budownictwie, inżynierii środowiska oraz górnictwie. Stąd zróżnicowane kryteria ich klasyfikacji. Ogólnie o podziale decydują: przeznaczenie, cechy konstrukcyjne mające wpływ na rodzaj użytkowania, a także rodzaj osprzętu, masa eksploatacyjna, technologia wykonywania procesów roboczych. Koparki jednonaczyniowe często stanowią składową układów technologicznych kopalni odkrywkowej oraz systemów maszynowych stosowanych w budownictwie i inżynierii środowiska jako grupa maszyn roboczych ciężkich, przeznaczonych do urabiania i ładowania odspojonego urobku na dowolne środki transportowe.

EN

Single-bucket excavators are one of the most important series of types of machines applied in building industry, environmental engineering and mining industry. Therefore, their classification criteria are so diverse. In general the division can be made by: intended use, design features affecting the type of occupation as well as type of attachment, operating weight, operating processes technology. Single-bucket excavators are often a part of process systems in surface mining and machinery systems applied in building industry and environmental engineering as a group of heavy engineering machines, designed for mining and loading of separated output on any transport equipment.