Pamrih, Pamrih (2019) Optimisasi Jadwal Pembersihan Berdasarkan Perbedaan Tekanan Udara pada Air Dryer PT. Vale Indonesia Tbk. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
PT Vale Indonesia Tbk memiliki 14 unit compressor sentrifugal dan 3 unit Air dryer. Process Plant memerlukan flow udara antara 32.000 – 35.000 SCFM dan pressure antara 5.5 – 6.5 kg/cm2 serta dew point antara 10-15 oC. Inspeksi awal sebelum pembersihan kimia banyak di temukan fouling pada shell & tube heat exchanger setelah beroperasi selama 12-14 tahun. Chemical cleaning pada air dryer pertama kali di lakukan pada Agustus dan September 2017. 3 unit air dryer dan 13-14 unit compressor beroperasi sebelum dilakukan chemical cleaning. Drop pressure yang terjadi 30-34 Psi dan dew point > 20 oC. Tekanan udara turun di bawah 5.5 kg/cm2 sehingga terjadi gangguan operasi pada peralatan Dryer, Kiln. Setelah di lakukan chemical cleaning pada shell & tube heat exchanger pada air dryer maka hasil yang di peroleh drop pressure menjadi 5-10 Psi, dew point normal antara 10-15 oC dan 8-10 unit compressor dan 2 unit air dryer beroperasi. Metode penelitian ini adalah menganalisa model kenaikan perbedaan tekanan yang di sebabkan oleh pressure drop dengan batasan perbedaan tekanan yang masih di perbolehkan. Selain itu juga menganalisa time interval dari keadaan bersih atau perbedaan tekanan desain sampai perbedaan tekanan yang di perbolehkan dengan profit yang terbesar. Interval terbaik diberikan tiap 5 tahun sekali dalam jangka waktu 30 tahun dengan nilai drop pressure sebesar 14.3066 Psi sehinga masih berada pada batas pressure drop yang ditentukan (15 Psi), disisi lain cost cleaning terendah diberikan pada pembersihan 485,045 dollar per 5 tahun dengan total estimasi pengeluaran dalam 30 tahun sebesar 2,910,272 dollar.
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PT Vale Indonesia Tbk has 14 units of compressor centrifuges and 3 units of Air dryers. Process Plant requires airflow between 32,000-35,000 SCFM and pressure between 5.5-6.5 kg/cm2 and dew point between 10-15 oC. Initial inspection before chemical cleaning is found to be fouling in shell & tube heat exchangers after operating for 12-14 years. Chemical cleaning on the air dryer were first carried out in August and September 2017. 3 units of air dryers and 13-14 units of compressor operated before chemical cleaning was carried out. Drop pressure that occurs 30-34 Psi and dew point> 20oC. Air pressure drops below 5.5 kg/cm2 resulting in interruption of operation in Dryer equipment, Kiln. After doing chemical cleaning on the shell & tube heat exchanger on the air dryer, the results obtained by the drop pressure are 5-10 Psi, the normal dew point is between 10-15 oC and 8-10 units compressors and 2 units of air dryers operate. This research method is to analyze the model of the increase in pressure difference caused by fouling with the limit of the difference in pressure that is still allowed. In addition, it also analyzes the time interval of the net state or the difference in design pressure until the difference in pressure is allowed with the largest profit. The best Interval given each 5 years on 30 years estimation with drop pressure up to 14.3066 Psi so that the constraint area to take a minimum of the pressure drop that given on operation and optimization (15 Psi), beside on the lowest cost cleaning given on 485,045 dollar each 5 years with the total estimation up to 30 years with 2,910,272 dollar.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTF 620.106 4 Pam o-1 2019 |
| Uncontrolled Keywords: | Shell & Tube Heat Exchanger, Air dryer, Fouling, Drop pressure, Chemical Cleaning |
| Subjects: | Q Science > QC Physics > QC151 Fluid dynamics T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30101-(S2) Master Thesis |
| Depositing User: | Pamrih Pamrih |
| Date Deposited: | 20 Apr 2022 06:54 |
| Last Modified: | 20 Apr 2022 06:54 |
| URI: | http://repository.its.ac.id/id/eprint/62444 |
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