Ramadhan, Hidayat (2015) Analisa Penyebab Dan Pencegahan Failure Tube Air Fin Cooler 15-E-110 Akibat Crevice Corrosion (Studi Kasus PT. PERTAMINA RU VI Balongan). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Air fin cooler di unit Residue Catalytic Cracker (RCC)
mempunyai peran penting untuk mengkondensasikan hasil olahan
katalis pada proses perengkahan residue di main column. Fluida
service yang mengalir dalam air fin cooler adalah wet gas hasil
fraksinasi dari main column yang mengandung chloride dan
nitrogen. Tingginya kandungan chloride dan nitrogen dalam fluida
service menyebabkan terjadinya korosi pada tube air fin cooler.
Jika hal ini terus dibiarkan, maka umur tube air fin cooler akan
lebih pendek daripada yang seharusnya.
Pada tugas akhir ini akan dianalisa penyebab tingginya laju
korosi dengan menggunakan metode Root Cause Failure Analysis
(RCFA). RCFA digunakan untuk mencari penyebab terjadinya
kerusakan sehingga solusi untuk pencegahannya dapat dilakukan.
Metode yang dilakukan adalah proses analysis, mapping, flowchart
serta metode why analysis.
Tingginya laju korosi disebabkan oleh presipitat
ammonium chloride pada tube air fin cooler. Endapan ini akan
menyebabkan plugging pada tube dan under deposit corrosion.
Presipitat ammonium chloride disebabkan karena reaksi
ammonium dan hydrogen chloride pada temperature di atas
temperature titik embun air. Presipitat dibuktikan oleh kenaikan
i
pressure drop pada air fin cooler 15-E-110. Kenaikkan ini
menunjukkan potensi salt loading di air fin cooler.
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Air fin cooler in Residue Catalytic Cracker Unit
(RCCU) has an important role to condense fluid services
from main column. Fluid services that flows in air fin cooler
is wet gases from main column which is contain chloride and
nitrogen. High concentration of chloride and nitrogen can
cause corrosion in tube air fin cooler. If this phenomenon
continues, there will be leakage in air fin cooler.
In this final project, the problem of failure tube air fin
cooler will be re-evaluated using the Root Cause Failure
Analysis (RCFA). RCFA is used to find the cause of the
failure and provide a solution to the problem in order to
prevent damage to the failure tube air fin cooler is not
repeated. The method does is process analysis, mapping and
flowcharts, and why analysis methods.
The high rate of corrosion level is caused by
ammonium chloride precipitates in air fin cooler. These
deposits will cause plugging the tube and under deposit
corrosion. Ammonium chloride is the precipitate from the
reaction of ammonium and chloride at temperature above the
dew point level. Precipitate is shown by the increasing
iii
pressure drop. This level shown the potential of salt loading
in main column overhead system.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 620.112 23 Ram a |
| Uncontrolled Keywords: | Air Fin Cooler, Korosi, Residue Catalytic Cracker |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 25 Apr 2018 02:01 |
| Last Modified: | 25 Apr 2018 02:01 |
| URI: | http://repository.its.ac.id/id/eprint/51802 |
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