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Optimalisasi Perawatan Seating & Spindle Exhaust Valve Main Engine pada MV. Lumoso Pratama Wahyu Kiki Nurhidayat; Mustholiq; Riyadini Utari; Budi Cahyono
Indonesian Journal of Marine Engineering Vol 1 No 2 (2024): August
Publisher : Politeknik Ilmu Pelayaran Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46484/ijme.v1i2.754

Abstract

The main engine is engine on board the ship which is the main force drive to move the ship which must be considered for performance and maintenance. The exhaust valve is an engine component that functions as a medium for the exit of exhaust gases from fuel combustion or exhaust gas which is forwarded to the chimney menu or the exhaust gas economizer. As the main component in the main machine, it must maintain performance and carry out maintenance by the rules that have been set. Because the seating exhaust valve and spindle exhaust valve components are always in contact, these two components require more maintenance and attention to support the working process of the main engine. The method used by the author in this study is the qualitative descriptive method. The source of research data obtained by researchers comes from observation, interviews, and documentation and is supported by fishbone and SHEL diagram methods to analyze factors that cause problems in problem formulation. Furthermore, it is analyzed so that it becomes a finding that is given a solution to the problem and becomes a research paper. Factors causing damage to seating and spindle exhaust valves There are various indications found by researchers by the elements of fishbone and SHEL analysis methods, namely poor maintenance factors or PMS, unoriginal spare parts, measurement of guide bushing allowances, cylindrical oil piston rings exceeding running hours, engine room air factors, as well as errors in installation and maintenance efforts carried out on seating and spindle exhaust valves, namely carrying out the appropriate PMS in the manual book, using original spare parts, measurements on guide bushing diameters, check running hours of cylinder oil piston rings, filter installation engine room air and communication between machinists so that there are no errors in the installation of exhaust valve components. Main engine adalah permesinan induk diatas kapal yang menjadi penggerak tenaga utama guna menggerakan kapal yang harus diperhatikan kinerja dan perawatannya. Exhaust valve sebagai komponen mesin yang memiliki fungsi sebagai media keluarnya gas buang sisa pembakaran bahan bakar atau exhaust gas yang diteruskan menu cerobong atau ke exhaust gas economiser. Sebagai komponen utama dalam mesin induk yang harus dijaga performa dan melaksanakan perawatan yang sesuai dengan aturan yang telah ditetapkan. Karena seating exhaust valve dan spindle exhaust valve komponen yang selalu bersentuhan, membuat kedua komponen ini memerlukan perawatan dan perhatian yang lebih agar dapat menunjang proses kerja mesin induk. Metode yang digunakan penulis dalam penelitian ini adalah metode deskriptif kualitatif. Sumber data penelitian yang diperoleh peneliti berasal dari observasi, wawancara, dan dokumentasi serta didukung metode diagram fishbone dan SHEL untuk menganalisis faktor yang menyebabkan masalah pada rumusan masalah. Selanjutnya dianalisa sehingga menjadi sebuah temuan yang diberikan pemecahan masalahnya dan menjadi sebuah tulisan penelitian. Faktor penyebab kerusakan seating dan spindle exhaust valve terdapat berbagai indikasi yang ditemukan peneliti sesuai dengan unsur metode analisis fishbone dan SHEL yaitu faktor pemeliharaan atau PMS yang kurang baik, sparepart yang tidak orisinil, pengukuran kelonggaran guide bushing, ring piston minyak silinder melebihi running hour, faktor udara kamar mesin, serta kesalahan dalam pemasangan dan upaya perawatan yang dilakukan pada seating dan spindle exhaust valve yaitu melaksanakan PMS yang sesuai pada manual book, menggunakan sparepart yang orisinil, pengukuran pada diameter guide bushing, check running hours ring piston minyak silinder, pemasangan filter udara kamar mesin serta komunikasi antar masinis agar tidak terjadi kesalahan dalam pemasangan komponen exhaust valve.
Analisis Kualitas Air Laut Berdasarkan Parameter Fisika dan Kimia (Kekeruhan, DO, pH dan TDS) di Wilayah Perairan Jawa Tengah Indah Nurhidayati; Aryanti Fitrianingsih; Amad Narto; Riyadini Utari; Shabrina Putri Chairandy; Anang Budi Nugroho
Bulletin of Community Engagement Vol. 6 No. 1 (2026): Bulletin of Community Engagement
Publisher : CV. Creative Tugu Pena

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51278/bce.v6i1.2224

Abstract

The increase of shipping activities and the entry of domestic, agricultural, and industrial waste through large rivers carry organic and inorganic pollutant loads into the waters of Central Java, becoming a contributing factor to marine environmental pollution. This will affect the seawater quality so that it will damaging the ecosystem. Maintaining seawater quality is one of the most important things, so a scientific study was conducted by analyzing seawater quality based on Physical and Chemical parameters. The analysis was carried out using the Pollution Index (IP) Method and testing on turbidity, dissolved oxygen (DO), acidity level (pH) and Total Dissolved Solids (TDS). Seawater samples were taken at KSOP Semarang, Rembang Sea, Semarang Sea, Kendal Sea, Batang Sea, Cilacap Sea and Kebumen Sea at different times for three consecutive days. Turbidity measurements used a Thermo Scientific type TN-100 Turbiditymeter. TDS measurements used an Extech Instrument type Exstik II TDS Meter. DO measurements used a DO Meter AZ 8430. pH measurements used an OHAUS type Aquasearcher pH Meter. There are four areas which declared to meet the quality standards, those are KSOP Semarang IP value of 0.891, Semarang Sea with IP of 0.891, Batang Sea with IP of 0.970, and Kebumen Sea with IP of 0.851. While the other three seas indicate light pollution, namely the Rembang Sea with IP of 3.867, Kendal Sea with IP of 1.219, and Cilacap Sea with IP of 1.802. Factors influencing the seawater’s physical and chemical parameters include anthropogenic activities such as runoff from land, waste disposal, port activities, and coastal erosion, besides, natural factors including rainfall, river flow, and geological conditions. The impact of changes in physical and chemical parameters on marine ecosystems and human activities are reduction in marine tourism, sedimentation in shipping lanes and ports, reduced biodiversity also a disruption of marine ecosystems.