Optimalisasi Sistem Perawatan Dan Perbaikan Terencana Mesin Produksi Berdasarkan Analisis Keandalan Pada Pltd Hatiwe Kecil Kota Ambon

Based on preliminary surveys, PLTD X has been operated long enough so that the generator engines often impaired even cause damages during operation. Even maintenance system contained in the PLTD X also has not done, which means there decrease in the production of electrical power generated.Maintenance activities that have been performed by PLTD X is the replacement of engine components damaged as a rejuvenation effort and overhaul that aims to extend the lifespan of the machine, but it is also the act of Preventive maintenance which aims to treat the machines that do not damage or interruption in operation. The dispute resolution process is the method for analyzing the Reliability Centered Maintenance component failure with FBD, System function and functional failure, FMEA and RCM Decision Worksheet. It also can determine the value of Mean Time To Failure (MTTF) and Mean Time To Repair (MTTR) is used to analyze systems engine maintenance. and as a basis for determining the time interval maintenance and total cost of maintenance.Based on the results of the calculation known critical components such as Cylinder Head, Inlet valve, Gasket, Exhaust Valve Housing, Exhaust Valve. Component maintenance time intervals determined by the RCM method is as follows, Cylinder Head with interval 4458 hours, Inlet Valve with 1601 hour, Gasket with 4682 Hours, Exhaust Valve Housing with 1908 hours, Exhaust Valve with 2238 hour. Critical component consisting of Cylinder Head, Inlet Valve, Gasket, Exhaust Vave Housing and Exhaust Valve is usingSchedulled Restoration Task type of maintenance

Using System Dynamics to Simulate the Management of Operation and Maintenance of Ship Machinery under the Port Availability Constraints

The total cost of ship machinery operation (CT) must be kept at the minimum value while considering the safety from failure. This paper proposes a model to minimize the CT by endeavouring the value of minimum Reliability Index (RI) of the machinery. The minimum RI is the level of reliability of machinery where we need to take maintenance action after some period of operation time. The alteration of minimum RI causes the changes of the composition of CT, including running cost (Cr), maintenance cost (Cm) and downtime cost (Cd). This paper discusses the operation of pumps which are installed in the cooling system of main engine of ship. As constraint, the maintenance of the pumps is assumed only possible to be carried out in the particular available port. This study utilizes the System Dynamics (SD) to construct two kinds of proposed models of machinery operation. They are model 1, without forecasting and model 2, with forecasting of minimum RI. Model 1 results in minimum CT, while model 2 reaches a CT lower than the outcome of model 1

DEVELOPMENT OF MODEL-DRIVEN DECISION SUPPORT SYSTEM TO SCHEDULE UNDERWATER HULL CLEANING

Maritime industries are constantly searching for a method to enhance ship efficiency, with increasing concern about the environmental impact and rising fuel prices. Marine biofouling is one of the factors that increase ship fuel consumption. However, removing the fouling of the ship requires effort for hull maintenance. Due to the trade-off between conducting maintenance and performance degradation, this study presents the development of a Model-Driven Decision Support System (MD-DSS) to predict the optimum time for underwater hull cleaning for biofouling management. Five stages (sub-models) are employed to develop a DSS, namely: ship resistance estimation, estimation of additional resistance due to biofouling, an iterative-based method for determining the best time to conduct the hull cleaning, and an analysis report. The implemented algorithm was validated by comparing its result with a manually scheduled maintenance date. The DSS is able to determine the best time (date) for maintenance in all given scenarios. By giving two scenarios of different maintenance costs and different fuel prices, the optimisation results produce the same number of maintenances. Within 60 months, four to five hull cleanings are required. It is also found that when the optimal number of maintenances is known, then increasing this number will not have any impact on reducing the hull cleaning costs because the reduction in fouling does not significantly reduce the costs incurred for maintenance. During several trials of the DSS, it is shown that the system can generate maintenance schedules for different time intervals of ship operation within an acceptable time. It takes approximately 52 minutes, 12 minutes, and 5 minutes consecutively to determine the maintenance schedules for ship operation intervals of 5 years, 2.5 years, and 1 year

Integração das actividades de manutenção e produção em instalações de tratamento de águas

O estudo do tema em causa vai de encontro com a necessidade de unir duas das áreas mais importantes da engenharia, a manutenção e a produção. Nesse sentido delineou-se que o objectivo seria levar a cabo o desenvolvimento de um modelo que possibilite relacionar os componentes considerados mais importantes, em termos de periodicidade de manutenção, com os materiais e processos produtivos dos mesmos. Desta forma, em primeiro lugar procedeu-se ao estudo das tarefas realizadas pela empresa. De seguida, idealizou-se um modelo empírico de relação entre os componentes dos equipamentos e a sua necessidade de manutenção. Depois disto e do estudo das tarefas realizadas pela firma, procedeu-se à introdução desses dados numa base ERP. Por último, analisou-se a possibilidade de uma retroacção neste processo por forma a melhorar a concepção dos equipamentos, quer a nível de processos de fabrico quer a nível dos materiais usados nos mesmos. Da aplicação do modelo empírico a um equipamento real, resultou a definição e priorização dos componentes que, teoricamente, mais careciam de manutenção. Estes resultados foram de encontro com o histórico do equipamento. Para além disso, foi possível apontar uma causa provável da existência desses componentes críticos, tal como apontar possíveis soluções para esses componentes. A principal contribuição deste trabalho foi o desenvolvimento de um modelo simples através do qual é possível detectar os componentes de maior desgaste para priorizar a sua intervenção. Por outro lado, e com base na informação gerada pela manutenção, propõe a existência de retroacção entre a área de manutenção e a área da produção no sentido de propor alterações a esses componentes de modo a ser reduzida a criticidade dos mesmos

Analisa Penentuan Interval Waktu Optimum Untuk Pemeriksaan Sistem Poros Baling-Baling Berdasarkan Jumlah Jam Operasional Kapal Dengan Pendekatan Teori Keandalan

In this research will be analyzed the determination optimally range of inspection time for propeller shaft, based on the reliability level from the components of the system. The determination for frequency and range of inspection time in the propeller shaft system is an important policy on the ship's maintenance management. The inspection which done in the right condition can early detect any small damages on the system, thus these damages can be solved soon before it cause any major damages and then cause the system totally cannot work. Determining the right range of inspection time has to be based on the component's reliability level from the system. The right inspection is done when the component's reliability level has decrease, but still in the permitted limit. Decreasing of the component's reliability level of the propeller shaft system is very close connected with the number of ship's operational time. Because as higher as the operational time of the ship, as faster as the decreasing of the component's reliability level. The inspection is about the releasing of the propeller shaft, which is recently done, mounted on the class' rule where is hold on the specify range of time (Three years for the system with the seawater lubrication, and five years for the system with the oil lubrication), without considering the operational time of the ship. So that, it is needed to analyze the determination of the optimally range of inspection time to check the propeller shaft system based on the number of the ship's operational time, with approach to the reliabilities theory which results is minimizing the ship's maintenance cost

Establishment of a novel predictive reliability assessment strategy for ship machinery

There is no doubt that recent years, maritime industry is moving forward to novel and sophisticated inspection and maintenance practices. Nowadays maintenance is encountered as an operational method, which can be employed both as a profit generating process and a cost reduction budget centre through an enhanced Operation and Maintenance (O&M) strategy. In the first place, a flexible framework to be applicable on complex system level of machinery can be introduced towards ship maintenance scheduling of systems, subsystems and components.;This holistic inspection and maintenance notion should be implemented by integrating different strategies, methodologies, technologies and tools, suitably selected by fulfilling the requirements of the selected ship systems. In this thesis, an innovative maintenance strategy for ship machinery is proposed, namely the Probabilistic Machinery Reliability Assessment (PMRA) strategy focusing towards the reliability and safety enhancement of main systems, subsystems and maintainable units and components.;In this respect, the combination of a data mining method (k-means), the manufacturer safety aspects, the dynamic state modelling (Markov Chains), the probabilistic predictive reliability assessment (Bayesian Belief Networks) and the qualitative decision making (Failure Modes and Effects Analysis) is employed encompassing the benefits of qualitative and quantitative reliability assessment. PMRA has been clearly demonstrated in two case studies applied on offshore platform oil and gas and selected ship machinery.;The results are used to identify the most unreliability systems, subsystems and components, while advising suitable practical inspection and maintenance activities. The proposed PMRA strategy is also tested in a flexible sensitivity analysis scheme.There is no doubt that recent years, maritime industry is moving forward to novel and sophisticated inspection and maintenance practices. Nowadays maintenance is encountered as an operational method, which can be employed both as a profit generating process and a cost reduction budget centre through an enhanced Operation and Maintenance (O&M) strategy. In the first place, a flexible framework to be applicable on complex system level of machinery can be introduced towards ship maintenance scheduling of systems, subsystems and components.;This holistic inspection and maintenance notion should be implemented by integrating different strategies, methodologies, technologies and tools, suitably selected by fulfilling the requirements of the selected ship systems. In this thesis, an innovative maintenance strategy for ship machinery is proposed, namely the Probabilistic Machinery Reliability Assessment (PMRA) strategy focusing towards the reliability and safety enhancement of main systems, subsystems and maintainable units and components.;In this respect, the combination of a data mining method (k-means), the manufacturer safety aspects, the dynamic state modelling (Markov Chains), the probabilistic predictive reliability assessment (Bayesian Belief Networks) and the qualitative decision making (Failure Modes and Effects Analysis) is employed encompassing the benefits of qualitative and quantitative reliability assessment. PMRA has been clearly demonstrated in two case studies applied on offshore platform oil and gas and selected ship machinery.;The results are used to identify the most unreliability systems, subsystems and components, while advising suitable practical inspection and maintenance activities. The proposed PMRA strategy is also tested in a flexible sensitivity analysis scheme

Model pouzdanosti u procesu eksploatacije dizel motora

U okviru disertacije je na osnovu teorijske i empirijske analize i korišćenjem podataka iz eksploatacije, formiran model pouzdanosti koji će doprineti povećanju pouzdanosti i sigurnosti funkcionisanja dizel motora u procesu eksploatacije.Within this dissertation, on the basis of theoretical and empirical analysis and usage of exploitation data, a reliability model was formed that will contribute to reliability increase and safety of diesel engine operation in the exploitation process

Reliability Ensuring Models of Complex Facilities in Thermal Power Plants

Ova studija ima za cilj da prikaže mogućnost generisanja modela obezbeđenja pouzdanosti složenih postrojenja u termoelektranama.The goal of this study is to show the possibility of generating reliability ensuring models of complex facilities in thermal power plants