ABSTRAKKapal penangkap ikan di Indonesia sebagian besar menggunakan mesin diesel sebagai tenaga penggeraknya. Mesin diesel merupakan mesin mekanis dimana singgungan komponen tidak dapat dihindari, sehingga sistem pelumas mutlak diperlukan untuk mengurangi tingkat kerusakan komponen yang bersinggungan. Penurunan kemampuan sistem pelumas berdampak pada kerusakan mesin. Tujuan penelitian ini untuk mengidentifikasi penyebab kerusakan sistem pelumas mesin diesel kapal penangkap ikan sehingga memudahkan untuk membuat keputusan dalam melakukan tindakan perawatan dan perbaikan sistem pelumas. Metode untuk mengidentifikasi tiap kegagalan yang mungkin terjadi menggunakan Preliminary Hazard Analysis (PHA) dan Fault Tree Analysis (FTA). PHA merupakan perangkat untuk mengidentifikasi potensi bahaya yang mengakibatkan kegagalan sistem, FTA merupakan perangkat untuk mengidentifikasi penyebab kegagalan sistem. FTA bekerja dengan menentukan kegagalan yang disebut sebagai "top event", selanjutnya top event diidentifikasi hubungan faktor penyebab berbagai peristiwa kegagalan dengan pohon kesalahan yang menggunakan gerbang logika sederhana "and" dan "or". Terbentuknya FTA dapat menentukan faktor penyebab kegagalan dengan minimal cut set. Berdasarkan hasil analisis, terdapat tiga penyebab utama mesin diesel mengalami kegagalan karena sistem pelumas adalah gagalnya komponen sistem pelumas yaitu Kebocoran internal, (Screen pelumas + alarm tekanan + manometer + petugas), dan (Pompa pelumas + alarm tekanan + manometer + petugas). Kata kunci: identifikasi kegagalan, sistem pelumas, fault tree analysis ABSTRACTMost fishing vessels in Indonesia use diesel engines as their driving force. Diesel engines are mechanical machines where component contact is unavoidable, so a lubricating system is absolutely necessary to reduce the level of component damage that intersects. The decrease lubricating system capability has an impact on engine damage. The purpose of this study is to identify the causes of damage to the diesel engine lubricating system for fishing vessels, making it easier to make decisions in carrying out maintenance and repairing lubricant systems. The method for identifying each possible failure occurs using a Preliminary Hazard Analysis (PHA) and Fault Tree Analysis (FTA). PHA is a device to identify potential hazards that result in system failure, FTA is a device to identify the causes of system failure. FTA works by determining failures which are referred to as "top events", then the top event identifies the relationship of the factors causing various failure events with fault trees that use simple logic gates "and" and "or". The formation of an FTA can determine the factors causing failure with a minimum cut set. Based on the results of the analysis, there are three main causes of diesel engines failing because the lubricating system is the failure of lubricating system components
Among all available renewable energy sources, solar energy is the most abundant one and is available in both direct as well as indirect forms. People have applied solar energy as energy alternative in various fields. One of the field that use solar energy is drying. Drying is one of the best methods to preserve product like fish. Fish drying is practice to preserve the fish for longer duration. Entrapment of thermal energy from solar radiation may be the best option for fish drying by using closed drying (greenhouse). This study aims to determine the effect of inlet velocity of air to the thermal performance of greenhouse in the no-load conditions by considering several environmental parameters such as temperature, humidity and solar radiation. The half an hourly data for ambient temperature, outlet temperature, relative humidity of air, wind velocity, radiation intensity were taken inside and outside the greenhouse dryer. These data are used for the determination of thermal performance of active greenhouse dryer. From experimental results, it can be concluded that drying conditions with inlet velocity of air 0,8 m/s is more favorable than inlet velocity of air 1,6 m/s as obtained thermal efficiency of active greenhouse is higher.
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