Heat exchanger BE-505B sebagai pemanas umpan tahap 7 di unit purifikasi PT Amoco Mitsui PTA Indonesia mengalami kebocoran pada bagian expansion joint sehingga perlu dicari metode pemanasan umpan lain yang sesuai dengan kebutuhan proses. Periode pengambilan data dilakukan dari bulan Februari sampai Maret 2012 di bagian departemen teknikal seksi Process Engineering PT Amoco Mitsui PTA Indonesia. Penelitian ini bertujuan untuk menentukan pilihan terbaik dari 3 opsi yang dilakukan dengan memenuhi kondisi operasi yang telah ditentukan. 3 opsi metode pemanasan umpan tersebut yaitu opsi 1 dengan menaikkan laju alir hot oil, opsi 2 dengan menaikkan temperatur hot oil yang digunakan sebagai media pemanas pada laju alir 500 ton/jam, 600 ton/jam dan 675 ton/jam. Opsi 3 mengganti heat exchanger BE-505B dengan spare heat exchanger dengan nomor tag BE-504B. Semua perhitungan dilakukan menggunakan metoda NTU (Number of Transfer Unit) dan diselesaikan dengan menggunakan program komputer MATLAB (Matrix Laboratory). Dari hasil perhitungan diperoleh bahwa opsi 3 merupakan opsi yang tepat untuk diaplikasikan karena pemanasan umpan (slurry) dapat mencapai temperatur 288°C pada laju alir hot oil 490.000 kg/jam dan temperatur hot oil 323,814°C. Kenaikan temperatur hot oil mengakibatkan bertambahnya kebutuhan bahan bakar untuk memanaskan hot oil sebesar 245,9 m3/jam, sehingga biaya yang harus ditambahkan untuk penambahan bahan bakar tersebut sebesar US$ 65,5 /jam. Kata kunci : heat exchanger, hot oil, Number of Transfer Unit

There is a leakage at expansion joint in BE-505B heat exchanger as the 7th stage feed of pre-heater in purification unit PT Amoco Mitsui PTA Indonesia so that other methods of heating the feed has to be obtained to suit the needs of the process. Data were collected from February to March 2012 in the process engineering section of the technical department PT Amoco Mitsui PTA Indonesia. This study aimed to determine the best choice of three options of heating method of the feed which suits the operating condition. Three option methods of heating the feed were increasing the flow rate of hot oil as the first option, second option is increasing the temperature of hot oil used as heating media at a flow rate of 500, 600 , and 675 ton/hour. The third option was to change the BE-505B heat exchanger with a spare heat exchanger with the tag number of BE-504B. All calculations were done using the method of NTU (Number of Transfer Unit) and solved using a computer program MATLAB (Matrix Laboratory). From the calculation results, it was obtained that the third option was the correct option since the feed (slurry) could reach temperature of 288°C, at hot oil flow rate of 490 ton/hour, and hot oil temperature of 323,814°C. The effect of increasing hot oil temperature was the increase of fuel to heat the hot oil to 236,18 m3/hour. So the cost should be added to increase the fuel equals to US$ 65,5/hour. Keywords : heat exchanger, hot oil , Number of Transfer Unit

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