EVALUASI TERMAL-STRUKTURAL AKIBAT HOTSPOT PADA ROOF FURNACE REAKTOR DESULFURISASI 13F1 PT PERTAMINA RU IV CILACAP MENGGUNAKAN METODE ELEMEN HINGGA
Marshal Andreas, Dr. Urip Agus Salim, S.T., M.Eng.Sc.
2026 | Skripsi | TEKNIK MESIN
Inspeksi termografi
inframerah pada 4 Agustus 2025 mendeteksi hotspot dengan temperatur
633,5°C pada roof furnace reaktor 13F1 di PT Pertamina RU IV
Cilacap, yang diduga disebabkan oleh degradasi refractory. Tugas akhir
ini mengevaluasi kondisi tegangan dan temperatur pada area hotspot menggunakan
simulasi coupled steady-state thermal dan static structural
pada ANSYS Workbench, serta menentukan geometri kerusakan refractory
dan alternatif penanganan tanpa shutdown.
Model 3D dibuat di SolidWorks
berdasarkan data geometri PT Pertamina. Tiga kondisi dianalisis: as built
(refractory utuh), kerusakan refractory (pengurangan tebal 120 mm
pada area ? 1430 mm), dan penanganan lokal (patching refractory + dua
profil kanal C). Validasi dilakukan terhadap data termografi pada empat titik
pengukuran dengan penyimpangan maksimum 3,34%.
Tegangan Von mises
pada area hotspot akibat kerusakan refractory tercatat 222,07 MPa
(88,83?ri yield 250 MPa), thermal strain meningkat 38,2%, dan
deformasi lokal meningkat 20,4%. Setelah penanganan, temperatur permukaan luar
turun dari 632,14°C menjadi 182,59°C (71,1%), tegangan Von mises turun
menjadi 6,98 MPa (96,9%), dan deformasi turun 29,9%. Penanganan lokal ini layak
diterapkan sebagai online repair tanpa penghentian operasi furnace.
An infrared
thermography inspection on August 4, 2025, detected a hotspot with a maximum
temperature of 633.5°C on the roof of reactor furnace 13F1 at PT Pertamina RU
IV Cilacap, suspected to be caused by refractory degradation. This study
evaluates the stress and temperature conditions at the hotspot area using
coupled steady-state thermal and static structural simulation in ANSYS
Workbench, and determines the refractory damage geometry and a local repair
alternative without shutdown.
A 3D model was
created in SolidWorks based on PT Pertamina's geometric data. Three conditions
were analyzed: as-built (intact refractory), refractory damage (120 mm
thickness reduction over a 1430 mm diameter area), and local repair (refractory
patching supported by two C-channel profiles). Validation against thermography
data at four measurement points showed a maximum deviation of 3.34%.
The Von mises stress
at the hotspot due to refractory damage was 222.07 MPa (88.83% of 250 MPa yield
strength), thermal strain increased by 38.2%, and local deformation increased
by 20.4%. After repair, the outer surface temperature decreased from 632.14°C
to 182.59°C (71.1%), Von mises stress decreased to 6.98 MPa (96.9%), and
deformation decreased by 29.9%. The proposed local repair is feasible as a
medium-term online repair solution without furnace shutdown.
Kata Kunci : Furnace Reaktor, Hotspot, Refractory, Tegangan Von mises, Analisis Termal-Struktural, ANSYS Workbench, Termografi Inframerah, Reactor Furnace, Hotspot, Refractory, Von mises Stress, Thermal-Structural Analysis, ANSYS Workbench, Infrared Thermography.
