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Impact of defective turbocharging system on the safety and reliability of large marine diesel engine

Anantharaman M., Islam R., Sardar A., Garaniya V., Khan F.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2021

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Vol. 15 No. 1

189--198

EN

Today huge capacity sea-going vessels are propelled by mega high-powered marine diesel ‎engines, referred to as Main Engine. Turbocharging system is an integral part of large marine diesel engine plant, ‎contributing to their safety, reliability, and efficiency. Defects in the turbocharging system ‎could result in higher fuel consumption, erratic running of the Main Engine, and in the worst ‎scenario may result in the stoppage of the Main Engine at sea. An inefficient turbocharging system may also cause major damage to turbochargers, resulting in undesirable accidents out at sea. To ‎avoid such undesirable accidents and ensure smooth operations of the Main Engine, it is required to ‎address this concern. The aim of this research is to study the turbocharging system for a ‎large Main Engine using a Kongsberg engine ‎simulator. Various malfunction of the ‎Turbocharging system is considered, relevant data is collected and analysed. ‎Moreover, a Fault Tree Analysis, (FTA) is considered to identify the top undesirable event ‎which is the failure of the Main Engine. Based on the results of this study, various steps ‎are suggested to avoid failure of the Main Engine due to the defective turbocharging ‎system.‎

2

Probabilistic Safety Assessment of ESBWR gravity driven cooling system

Kaszko Aleksej, Niewiński Grzegorz, Stępień Michał

Modern Engineering

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2020

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1

18--25

EN

According to Polish nuclear law, newly emerging nuclear facilities require probabilistic safety assessment (PSA). This article is intended to present the PSA method and to present the error tree method by which the probability of unavailability of the gravity reactor cooling system (GDCS) of the ESBWR power plant designed by GE Hitachi was determined. This work includes creatiion process of a damage tree and performing a quantitative analysis in SAPHIRE tool and estimating uncertainty using the Monte Carlo method. As a part of the work, it was shown that in the probability of failure of a single GDCS P LINE-A line, the most important element are the basic events related in particular to the operation of service valves.

3

Analiza zagrożeń na wybranych stanowiskach pracy z zastosowaniem drzewa błędów

Ignac-Nowicka J.

Systemy Wspomagania w Inżynierii Produkcji

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2017

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Vol. 6, iss. 7

97--104

PL

W artykule przedstawiono analizę zagrożeń metodą drzewa błędów (FTA) dla wybranych stanowisk pracy. Zawarte w artykule schematy drzewa błędów ilustrują dwa typy zagrożeń: wypadkiem podczas pracy z prasą hydrauliczną oraz zniszczeniem maszyny na skutek przegrzania. W obu przypadkach przeprowadzona analiza wskazuje przyczyny zagrożenia wynikające z faktu awaryjności elementów maszyny lub stanowiska pracy oraz możliwe do popełnienia błędy operatora. Za pomocą drzewa błędów wskazano wzajemne związki między zdarzeniami prowadzącymi do zagrożenia w analizowanych przykładach. Zidentyfikowano również działania korygujące dla analizowanych zagrożeń w celu zminimalizowania ryzyka zawodowego.

EN

The paper presents an analysis of the Fault Tree Analysis (FTA) approach for selected workplaces. The fault tree diagrams included in this article illustrate two types of hazards: an accident when working with a hydraulic press and damage to a machine due to overheating. In both cases, the analysis indicates the cause of the hazard resulting from the failure of the machine or workpiece, and the operator's possible errors. The fault tree identifies the relationship between events leading to a threat in the analyzed examples. The corrective actions were also identified for the hazard analyzed to minimize occupational risk.