scholarly journals Risk Rating for Risk-Based Maintenance: A Case Study of Small Hydropower Plant in Nepal

2021 ◽  
Vol 16 (1) ◽  
pp. 87-94
Author(s):  
Rajan Sharma ◽  
Nawraj Bhattarai ◽  
Sanjaya Neupane
Keyword(s):  
Failure Mode ◽  
Risk Score ◽  
Critical Analysis ◽  
Cooling System ◽  
Hydropower Plant ◽  
Small Hydropower ◽  
Component Level ◽  
Effect Analysis ◽  
Transmission Equipment ◽  
Analysis Technique

Fourth generation maintenance philosophy and Quality management system 9001:2015, emphasis on the concept of risk based thinking. And it is one of the challenging part of maintenance department to adopt these philosophy by quantifying all the activities of the department. Risk rating based on reliability is one of the techniques to quantify the maintenance activities for those organizations, whose reliability of goods and services matter in the market. Hydropower sector is also among them whose reliability matters highly in consumer life standard. So this paper approaches to rate the risk of hydropower based on the reliability of components for the implementation of Risk-based maintenance. From the study of data recorded in log book of a small hydropower plant located in western part of Nepal, it was found that the overall reliability score of the plant was 0.9819, which was low as compared to other hydropower of Nepal, where turbine section of both the units of the plant found a higher risk score than other systems. Study adopted two tools i.e. Analytical Hierarchical based Fault Tree Analysis and Critical Analysis Technique to find the critical assets and Failure Mode and Effect Analysis for the rest of all to quantifying the risk in component level. The analysis shows that the cooling system as the critical asset for both the units and it contributes 72% and 64% in the reliability of the turbine section. The critical assets thus obtained was validated through the critical analysis technique. From which the risk score of cooling system found 90% in both the units. To analyze the risk in component level, Failure Mode and Effect Analysis of different sub component of critical assets was done. Among the sub-components of the cooling system, radial tube filter gets the highest risk score. Its components; cartridge, tube, and joints have the risk score of 450, 192, and 96 respectively. And from the critical analysis of the rest of the subsystems of uint-I and unit-II, components such as bearings, breaker of the transmission system, transmission equipment, excitation system and transformer of unit-I and breaker of the transmission system, transmission equipment and excitation system of unit-II are found to have higher critical score, hence, it is recommended to apply preventive activities on these components as per the manufacturer to reduce the risk that could be caused by their failure.

scholarly journals Identifying preventive maintenance guideline for a combine harvester with application of failure mode and effect analysis technique

2020 ◽  
Vol 319 ◽  
pp. 01004
Author(s):  
Voraya Wattanajitsiri ◽  
Rapee Kanchana ◽  
Surat Triwanapong ◽  
Kittipong Kimapong
Keyword(s):  
Risk Assessment ◽  
Failure Mode ◽  
Preventive Maintenance ◽  
Risk Priority Number ◽  
Effect Analysis ◽  
Analysis Technique ◽  
Combine Harvester ◽  
A Chain ◽  
Near Future

The objective of this research was to study a risk assessment of the rice combine harvester using FMEA technique implementation and suggested the procedures to maintain the parts of the rice combine harvester by analyzing the causes of risk assessment of FMEA. The FMEA was also applied to specify failure causes and effects that occurred in the rice harvester. The obtained data were calculated for a risk priority number (RPN) and then sorted to be a descending order. The high RPN part was analyzed for the causes and effects and then suggested a preventive maintenance in near future. The results revealed that the highest RPN of 576 was found when a chain surface was considered and also showed the maximum risk among the considered parts in the rice combine harvester. While, the lowest RPN of 144 was found when a rice sieve part was considered but this RPN was still higher than that of 100 RPN which was required to specify the preventive maintenance.

scholarly journals AN AHP APPLICATION TO EVALUATE SCORING CRITERIA FOR FAILURE MODE AND EFFECT ANALYSIS (FMEA)

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Dimas Campos Aguiar ◽  
Helder Jose Celani De Souza ◽  
Valerio Salomon
Keyword(s):  
Failure Mode ◽  
Automotive Industry ◽  
Critical Analysis ◽  
Scientific Contribution ◽  
Effect Analysis ◽  
Reference Table

<p>The Failure Mode and Effect Analysis (FMEA) has been developed by several researchers who have proposed distinct reference tables to score the Severity, Occurrence and Detection of a failure. This paper aims to evaluate, using AHP, several proposals for the application of Process FMEA, as well as to obtain and offer recommendations for its application. Five reference tables for Severity, six tables for Occurrence, and six tables for Detection are presented. These reference tables are evaluated for their application in the Brazilian automotive industry by using critical analysis and proper judgments. The scientific contribution of this paper is to provide a way to select a reference table, available in the FMEA literature, for the application of the FMEA process.</p><p>http://dx.doi.org/10.13033/ijahp.v2i1.69</p>

scholarly journals Reliability Based Maintenance in Hydropower: A Case Study of Bijaypur-I Small Hydropower Plant

2020 ◽  
Vol 3 (1) ◽  
pp. 123-130
Author(s):  
Rajan Sharma ◽  
Nawaraj Bhattarai
Keyword(s):  
Cooling System ◽  
Hydropower Plant ◽  
Cyclone Separator ◽  
Reliability Engineering ◽  
Small Hydropower ◽  
Human Needs ◽  
Modern Age ◽  
Reliability And Availability

Reliability engineering is emerging field which provides a tools to ensure the system is capable to deliver reliable product and service to the customer. Electricity is one of the most important human needs in this modern age. So reliability of such facilities plays important role in the quality of life and the economy of the county. Hydropower is one of the main source of energy in Nepal, whose reliability plays important role to successful transaction of traditional fuel to electricity to ensure the targeted energy consumption by government of Nepal in fifteenth five year plan. So this paper foster the way of improving the reliability of hydropower plant to ensure the reliability of power supply in National grid. As the study carried out in Bijayapur-I small Hydropower plant, the reliability and availability found as 0.876 and 0.793 only and insufficient flow seems the major contribution to decrease reliability as scheduled outage, whereby problem in turbine section plays important role to reduce the reliability in the electromechanical system of the plant whose contribution in reliability and availability is 79% so any failure in turbine section adversely affects the performance of plant. Due to this the maintenance strategy should be focused on turbine section. And the study recommended to increase the frequency of flushing of radial filter of cooling system, redundancy in filter system can increase the reliability, use of cyclone separator to separate the dissolved limestone and dissolved sand is the another option, and to use close loop cooling system instead of open system.

Failure Mode and Effect Analysis of a Thermal Power Plant for Enhancing its Reliability

2011 ◽  
Vol 110-116 ◽  
pp. 2969-2975 ◽  
Author(s):  
N.S. Bhangu ◽  
Rupinder Singh ◽  
G.L. Pahuja
Keyword(s):  
Power Plant ◽  
Failure Mode ◽  
Thermal Power Plant ◽  
Failure Modes ◽  
Thermal Power ◽  
Research Work ◽  
Component Level ◽  
Effect Analysis ◽  
Thermal Plant

Failure Mode and Effect Analysis (FMEA) has a well deserved reputation for systematic and thorough evaluation of failures at the system, sub-system or component level in all manufacturing and processing sectors. These organizations are looking for the final product to be “safe and reliable”. FMEA helps designers to identify and eliminate/control dangerous failure modes, minimizing damage to the system and its users. This paper, as an extension to the prior research work, introduces an insight into the reasons of failure and its effects in a thermal power plant opted for the case study, based on conceptual designs in context of FMEA. The analysis takes into account preparation of appropriate diagnostic and maintenance procedures with the aim of enhancement of thermal plant reliability. The FMEA technique used may be helpful for the design and maintenance departments to curtail the downtime of the plant.

scholarly journals Analisa Kegagalan Sistem Pelumasan dan Pemilihan Metode Perawatan M/E di Kapal Menggunakan Metode FMEA Dalam Rangka Menunjang Operasi Transportasi Laut di Indonesia

2020 ◽  
Vol 17 (1) ◽  
pp. 1-6
Author(s):  
Mohammad Danil Arifin ◽  
Fanny Octaviani ◽  
Theresiana. D. Novita
Keyword(s):  
High Risk ◽  
Failure Mode ◽  
Preventive Maintenance ◽  
Cooling System ◽  
Fuel Oil ◽  
Lubricating Oil ◽  
Effect Analysis ◽  
Oil Pump ◽  
Oil Cooler ◽  
Oil Tank

Mesin diesel sebagai mesin utama di kapal dapat berfungsi dengan baik apabila ditunjang oleh sistem-sistem pendukung yang baik pula. Sistem penujang diatas kapal meliputi sistem bahan bakar (fuel oil system), sistem pelumasan minyak (lubricating oil system), sistem pendingin (cooling system) dan sistem udara start (starting air system). Semua sistem tersebut memiliki fungsi serta peran yang sangat penting bagi operasional motor induk, hal ini dikarenakan apabila terjadi kerusakan pada salah satu sistem penunjangnya, motor induk pasti akan mengalami masalah dan mungkin motor induk tidak dapat beroperasi dengan baik. Oleh karena itu dirasa perlu untuk melakukan suatu analisa terhadap kerusakan suatu komponen dari sistem dikapal. Penelitian kali ini bertujuan untuk menganalisa kegagalan sistem pelumasan di kapal dan pemilihan metode parawatan motor induk di kapal menggunakan Failure Mode and Effect Analysis (FMEA) dalam rangka menunjang kelancaran transportasi laut. Dengan menggunakan FMEA Worksheet metode kegagalan serta effect yang ditimbulkan oleh tiap-tiap komponen dapat diketahui. Selanjutnya dengan melakukan analisa menggunakan risk matrik dapat diketahui tingkat kekritisan dari masing-masing komponen tersebut. Dari analisa yang telah dilakukan diketahui bahwa lubricating oil tank dan sump tank memiliki rating risk yang rendah, kemudian lubricating oil cooler memiliki nilai rating mayor dan lubricating oil pump, lubricating oil filter, purifier, transfer pump serta lubricating purifier heater memiliki nilai rating risk yang sama yakni high risk. Berdasarkan analisa yang telah dilakukan, metode perawatan yang sesuai adalah preventive maintenance dan corrective maintenance. Diharapkan dengan adanya pemilihan metode perawatan yang tepat dapat mendukung kelancaran dari operasi transportasi laut di Indonesia.

Risk analysis of cutting system under intuitionistic fuzzy environment

2020 ◽  
Vol 1 (1) ◽  
pp. 162-173
Author(s):  
Dinesh Kumar Kushwaha ◽  
◽  
Dilbagh Panchal ◽  
Anish Sachdeva ◽  
◽  
...  
Keyword(s):  
Risk Assessment ◽  
Failure Mode ◽  
Thermal Power ◽  
Failure Detection ◽  
Engineering System ◽  
Effect Analysis ◽  
Intuitionistic Fuzzy ◽  
Mode Effect ◽  
Cutting System ◽  
Failure Mode Effect Analysis

Failure Mode Effect Analysis (FMEA) is popular and versatile approach applicable to risk assessment and safety improvement of a repairable engineering system. This method encompasses various fields such as manufacturing, healthcare, paper mill, thermal power industry, software industry, services, security etc. in terms of its application. In general, FMEA is based on Risk Priority Number (RPN) score which is found by product of probability of Occurrence (O), Severity of failure (S) and Failure Detection (D). As human judgement is approximate in nature, the accuracy of data obtained from FMEA members depend on degree of subjectivity. The subjective knowledge of members not only contains uncertainty but hesitation too which in turn, affect the results. Fuzzy FMEA considers uncertainty and vagueness of the data/ information obtained from experts. In order to take into account, the hesitation of experts and vague concept, in the present work we propose integrated framework based on Intuitionistic Fuzzy- Failure Mode Effect Analysis (IF-FMEA) and IF-Technique for Order Preference by Similarity to Ideal Solution (IF-TOPSIS) techniques to rank the listed failure causes. Failure cause Fibrizer (FR) was found to be the most critical failure cause with RPN score 0.500. IF-TOPSIS has been implemented within IF-FMEA to compare and verify ranking results obtained by both the IF based approaches. The proposed method was presented with its application for examining the risk assessment of cutting system in sugar mill industry situated in western Uttar Pradesh province of India. The result would be useful for the plant maintenance manager to fix the best maintenance schedule for improving availability of cutting system.

scholarly journals Utility of Failure Mode and Effect Analysis to Improve Safety in Suctioning by Orotracheal Tube

2017 ◽  
Vol 32 (1) ◽  
pp. 28-37 ◽  
Author(s):  
Agustín Vázquez-Valencia ◽  
Andrés Santiago-Sáez ◽  
Bernardo Perea-Pérez ◽  
Elena Labajo-González ◽  
Maria Elena Albarrán-Juan
Keyword(s):  
Failure Mode ◽  
Effect Analysis ◽  
Orotracheal Tube

scholarly journals Development of a Hydropower Turbine Using Seawater from a Fish Farm

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 266
Author(s):  
Md Rakibuzzaman ◽  
Sang-Ho Suh ◽  
Hyoung-Ho Kim ◽  
Youngtae Ryu ◽  
Kyung Yup Kim
Keyword(s):  
Power Plants ◽  
Guide Vane ◽  
Cross Flow ◽  
Synchronous Generator ◽  
Fish Farm ◽  
Hydropower Plant ◽  
Fish Farms ◽  
Data Simulation ◽  
Small Hydropower ◽  
Hydropower Plants

Discharge water from fish farms is a clean, renewable, and abundant energy source that has been used to obtain renewable energy via small hydropower plants. Small hydropower plants may be installed at offshore fish farms where suitable water is obtained throughout the year. It is necessary to meet the challenges of developing small hydropower systems, including sustainability and turbine efficiency. The main objective of this study was to investigate the possibility of constructing a small hydropower plant and develop 100 kW class propeller-type turbines in a fish farm with a permanent magnet synchronous generator (PMSG). The turbine was optimized using a computer simulation, and an experiment was conducted to obtain performance data. Simulation results were then validated with experimental results. Results revealed that streamlining the designed shape of the guide vane reduced the flow separation and improved the efficiency of the turbine. Optimizing the shape of the runner vane decreased the flow rate, reducing the water power and increasing the efficiency by about 5.57%. Also, results revealed that tubular or cross-flow turbines could be suitable for use in fish farm power plants, and the generator used should be waterproofed to avoid exposure to seawater.

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