scholarly journals Risk Assessment tools for categorisation of failure modes of Marine Diesel Engine: A comparative study

2018 ◽  
Vol 2 (1) ◽  
pp. 30
Author(s):  
Ikuobase Emovon ◽  
Modestus Okechukwu Okwu
Keyword(s):  
Risk Assessment ◽  
Diesel Engine ◽  
Failure Modes ◽  
Assessment Tools ◽  
Risk Level ◽  
Marine Diesel Engine ◽  
Risk Matrix ◽  
Creative Commons ◽  
Risk Assessment Tools ◽  
Marine Diesel

Risk assessment is a vital element of most maintenance system, this is because safeguarding of equipment item requires maintenance strategies which usually depend on the degree of risk of the equipment item. In this paper two risk assessment tools; Risk Priority Number (RPN) based approach and Risk Matrix (RM) based approach, are presented for categorisation of risk of failure modes of marine diesel engine. The techniques are used to categorise failure modes into three risk levels; low, medium and high in turn and based on the risk level, maintenance strategy are assigned to each failure modes. Furthermore, the two techniques are compared and the result of the analysis revealed that, the extent of Risk matrix method similarity to the RPN approach depends on the benchmark for setting the risk level limit in the RPN method.    This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Failure Mode and Effects Analysis of Equipment Based on Grey Theory

2013 ◽  
Vol 313-314 ◽  
pp. 763-766 ◽  
Author(s):  
Zhen Dong Tan ◽  
Zun Feng Du
Keyword(s):  
Diesel Engine ◽  
Failure Modes ◽  
Triangular Fuzzy Number ◽  
Calculation Model ◽  
Grey Theory ◽  
Marine Diesel Engine ◽  
Relative Importance ◽  
Risk Levels ◽  
Decision Factors ◽  
Marine Diesel

Based on the uncertaintyproblem of decision factors in the fault diagnosis and maintenance ofequipment, the fuzzy method and grey theory were introduced. Firstly, fuzzyterms were applied to describe the basic variables (probability of occurrence,severity and detection). Triangular fuzzy number was selected to carry out thequantitative calculation of fuzzy terms and the defuzzification of membershipfunctions. Then the grey correlations of all Failure modes were computed andrisks were ranked, considering the relative importance of decision factors. Thefuel system of marine diesel engine was taken as an example. It is pointed thatalthough the risk priority numbers are equal, if the values or weights ofdecision factors are different, then the risk levels of Failure modes aredifferent as well. The results indicate that the calculation model can identifythe failures of ship equipment more precisely and optimize allocation ofmaintenance resources.

A Risk Assessment of a Novel Bulk Cargo Ship-to-Ship Transfer Operation Using the Functional Resonance Analysis Method

2017 ◽  
Author(s):  
Lauchlan J. Clarke ◽  
Gregor J. Macfarlane ◽  
Irene Penesis ◽  
Jonathan T. Duffy ◽  
Shinsuke Matsubara ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Failure Modes ◽  
Safety Management ◽  
New Technology ◽  
Assessment Tools ◽  
Analysis Method ◽  
Resonance Analysis ◽  
Risk Assessment Tools ◽  
Feeder Vessel ◽  
Transfer Operation

Risk assessments underpin a maritime operation’s safety management system. When applied to an untested concept a risk assessment can also assist with overcoming resistance to new technology. This paper proposes the functional resonance analysis method (FRAM) as a tool for developing design recommendations and fulfilling the safety management objectives of the ISM Code. The FRAM is applied to benefit the floating harbour transhipper (FHT), a novel concept for the transhipment of bulk commodities. The FHT acts as a large floating warehouse with an aft well dock that provides shelter for a feeder vessel. The FHT’s materials handling equipment transfers bulk cargo from the feeder vessel onto its own stockpile or directly to an export vessel moored alongside, or from its stockpile to the export vessel. Most risk assessment tools focus on identifying and addressing system components that can potentially fail. With the FRAM however, the scope, direction and recommendations are guided by a practical understanding of the variability of work undertaken rather than preconceived notions of potential failure modes. Adopting a method based on maximising resilience rather than minimising the causes of accidents promotes a shift from a blame culture to a safety culture. Applying the FRAM generated a deeper, broader and more transparent understanding of the FHT transfer operation than what would have been achievable using traditional risk assessment tools. This understanding was used to develop recommendations designed to improve the resilience of the FHT operation.

IMPACT ASSESSMENT ON STORM SURGE RISKS TO CONTAINERS CONSIDERING GLOBAL WARMING

2017 ◽  
Author(s):  
Rikito Hisamatsu ◽  
Rikito Hisamatsu ◽  
Kei Horie ◽  
Kei Horie
Keyword(s):  
Risk Assessment ◽  
Global Warming ◽  
Storm Surge ◽  
Storm Surges ◽  
Assessment Tools ◽  
Inundation Depth ◽  
Risk Assessment Tools ◽  
Risk Maps ◽  
The Impact ◽  
Vulnerability Functions

Container yards tend to be located along waterfronts that are exposed to high risk of storm surges. However, risk assessment tools such as vulnerability functions and risk maps for containers have not been sufficiently developed. In addition, damage due to storm surges is expected to increase owing to global warming. This paper aims to assess storm surge impact due to global warming for containers located at three major bays in Japan. First, we developed vulnerability functions for containers against storm surges using an engineering approach. Second, we simulated storm surges at three major bays using the SuWAT model and taking global warming into account. Finally, we developed storm surge risk maps for containers based on current and future situations using the vulnerability function and simulated inundation depth. As a result, we revealed the impact of global warming on storm surge risks for containers quantitatively.

scholarly journals The Benefits of Risk Assessment Tools for Prostate Cancer

2012 ◽  
Vol 61 (4) ◽  
pp. 662-663 ◽  
Author(s):  
Ian M. Thompson ◽  
Donna P. Ankerst
Keyword(s):  
Prostate Cancer ◽  
Risk Assessment ◽  
Assessment Tools ◽  
Risk Assessment Tools
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