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Abstrak :
Korasi pada sistem pendingin mesin otomotif sering terjadi pada komponen-komponen ferrous di dalam sistem, dan mengganggu proses kerja keseluruhan dari mesin. Untuk mengatasi hal ini sering ditambalnkan inhibitor-inhibitor korosi ke dalam air pendingln. Pendingan mesin (engine coolant) sebagaf aditif air pendingin mengandung inhibitor-inhibitor korosi untuk mengataai hal di atas. Penambahan Ethyleneglycol sebagai antibeku ke dalam pendlngin mesin dimalrsudlran agar kendaraan dapat bekerja sepanjang tahun, tidak terkecuali pada musim dingin. Diketahui bahwa ethylene glycol dapat menyebabkan korosi Sebagai contoh adalah graphitization' pada besi tuang dan dezmc.iflcatlon pada lfunlngan. Penelitian ini mencoba untuk mellhat pengaruh sifat korosif pendingin mesin yang mengandung ethylene glycol dengan yang tidak mengandung ethylene glycol terhadap logam-logam yang biasa terdapat di dalam sistem pendingin mesin otomotif. Enam jenis logam dibuat dalam dua hubungan trigalvanllc, lalu dicelup di dalam media celup selama 336 jam pada temperatur konstan 7100, dan di dalam kondisi aerasi sifat korosif dilihat dan laju korosi yang diperoleh. Dari hasil penelitian secara umum, terlihat laju korosi yang besar dari logam Dafa, besi tuang. aluminum, dan solder di dalam larutan korosif tanpa penambahan pendingin mesin . Kuningan dan tembaga memHlln? laju korosi yang relatif kecil karena sifat tahan korosi mereka yang tinggi. Setelah penambaban pendingin mesin sebesar 30 Z ke dalam larutan korosif terlihat penurunan dengan drastis semua laju korasi logam.

Abstrak :
[Seiring dengan semakin banyaknya kapal yang beroperasi pada saat ini seharusnya menuntut pihak pemilik dan pembuat kapal untuk meningkatkan kehandalan mesin utama kapal dalam proses pembuatan kapalnya melalui rancangan sistem pendukungnya yang optimum maupun ekonomis. Mesin yang dipasang pada kapal dirancang untuk bekerja dengan efisiensi maksimal dan berjalan selama berjam-jam lamanya. Hilangnya energi paling sering dan maksimum dari mesin adalah dalam bentuk energi panas. Untuk menghilangkan energi panas yang berlebihan harus menggunakan media pendingin untuk menghindari gangguan fungsional mesin atau kerusakan pada mesin. Salah satu bagian yang harus diperhatikan adalah sistem pendingin untuk mesin kapal. Sistem pendingin adalah salah satu bagian penting pada sebuah kapal yang memerlukan perhatian yang cukup, karena lancar atau tidaknya pengoperasian kapal sangat tergantung pada hasil kerja mesin, sebab dalam mesin diesel dinding silinder selalu dikenai panas dari pembakaran. Jika silinder tidak didinginkan, maka minyak yang melumasi torak akan encer dan menguap dengan cepat, sehingga torak maupun silinder dapat rusak akibat suhu tinggi hasil dari pembakaran. Sistem pendingin pada kapal tentunya akan optimal jika dilakukan perancangan yang baik melalui perhitungan yang tepat dan dilaksanakan sepraktis mungkin dengan minimum bengkokan dan sambungan las atau brazing untuk memperkecil adanya kerugian pada aliran pipa. Begitu juga dengan perhitungan dari sistem pompa harus dibuat secara efisien agar kinerja pompa menjadi optimum sehingga terciptanya rancangan sistem perpipaan untuk sistem pendingin mesin pada kapal yang dapat bekerja secara optimal. Pada penulisan ini bertujuan untuk mempelajari mengenai perhitungan kerugian aliran yang terjadi pada aliran sistem perpipaan untuk sistem pendingin mesin pada kapal tug boat 2 x 1600 HP sehingga dapat dijadikan pembelajaran dalam menentukan atau meningkatkan kinerja dari sistem pendingin mesin kapal. ......Along with the increasing number of vessels operating at this time should sue the owners and shipbuilders to improve the ship's main engine reliability in the process of making his ship through optimum support system design as well as economical. Engine mounted on a vessel is designed to work with maximum efficiently and runs for hours on end. Loss of the most frequent and maximum energy from the engine is in the form of heat energy. To get rid of excess heat energy must use the cooling medium to avoid functional impairment or damage to the machine engine. One part that must be considered is the cooling system for ship engines. The cooling system is one of the important parts on a ship that requires considerable attention, as well whether or not the operation of the vessel depends on the work of the machine, because the diesel engine cylinder wall is always subjected to the heat of combustion. If the cylinder is not cooled, the oil that lubricates the piston will dilute and evaporates quickly, so that the piston and the cylinder can be damaged by high temperatures result from combustion. The cooling system on the ship would be optimal if done good design through precise calculations and implemented as practical as possible with minimum bends and welded or brazed connections to minimize the loss in pipe flow. So also with the calculation of the pump system must be made efficiently in order to be the optimum performance of the pump so that the creation of the design of piping systems for engine cooling systems on ships that can work optimally. In this study aims to learn about the calculation of losses in pipe flow for engine cooling systems on ships tug boat 2 x 1600 HP so it can be used in determining the learning or improving the performance of the ship's engine cooling system.;Along with the increasing number of vessels operating at this time should sue the owners and shipbuilders to improve the ship's main engine reliability in the process of making his ship through optimum support system design as well as economical. Engine mounted on a vessel is designed to work with maximum efficiently and runs for hours on end. Loss of the most frequent and maximum energy from the engine is in the form of heat energy. To get rid of excess heat energy must use the cooling medium to avoid functional impairment or damage to the machine engine. One part that must be considered is the cooling system for ship engines. The cooling system is one of the important parts on a ship that requires considerable attention, as well whether or not the operation of the vessel depends on the work of the machine, because the diesel engine cylinder wall is always subjected to the heat of combustion. If the cylinder is not cooled, the oil that lubricates the piston will dilute and evaporates quickly, so that the piston and the cylinder can be damaged by high temperatures result from combustion. The cooling system on the ship would be optimal if done good design through precise calculations and implemented as practical as possible with minimum bends and welded or brazed connections to minimize the loss in pipe flow. So also with the calculation of the pump system must be made efficiently in order to be the optimum performance of the pump so that the creation of the design of piping systems for engine cooling systems on ships that can work optimally. In this study aims to learn about the calculation of losses in pipe flow for engine cooling systems on ships tug boat 2 x 1600 HP so it can be used in determining the learning or improving the performance of the ship's engine cooling system., Along with the increasing number of vessels operating at this time should sue the owners and shipbuilders to improve the ship's main engine reliability in the process of making his ship through optimum support system design as well as economical. Engine mounted on a vessel is designed to work with maximum efficiently and runs for hours on end. Loss of the most frequent and maximum energy from the engine is in the form of heat energy. To get rid of excess heat energy must use the cooling medium to avoid functional impairment or damage to the machine engine. One part that must be considered is the cooling system for ship engines. The cooling system is one of the important parts on a ship that requires considerable attention, as well whether or not the operation of the vessel depends on the work of the machine, because the diesel engine cylinder wall is always subjected to the heat of combustion. If the cylinder is not cooled, the oil that lubricates the piston will dilute and evaporates quickly, so that the piston and the cylinder can be damaged by high temperatures result from combustion. The cooling system on the ship would be optimal if done good design through precise calculations and implemented as practical as possible with minimum bends and welded or brazed connections to minimize the loss in pipe flow. So also with the calculation of the pump system must be made efficiently in order to be the optimum performance of the pump so that the creation of the design of piping systems for engine cooling systems on ships that can work optimally. In this study aims to learn about the calculation of losses in pipe flow for engine cooling systems on ships tug boat 2 x 1600 HP so it can be used in determining the learning or improving the performance of the ship's engine cooling system.]