Analisis Aliran Massa Pada Posisi 15 Sentimeter Setelah U-Bend Susunan Ke Sembilan Terhadap Corrosion-Erosion Material Pipa A351 Gr.CK20

Alzakky, Adam (2025) Analisis Aliran Massa Pada Posisi 15 Sentimeter Setelah U-Bend Susunan Ke Sembilan Terhadap Corrosion-Erosion Material Pipa A351 Gr.CK20. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 2038201003-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (4MB) | Request a copy

Abstract

Korosi Furnace merupakan salah satu bagian equipment dari Carbon Disulfida Production yang berada di area Chemical Plant yang berfungsi sebagai tungku pembakaran guna memanaskan sulfur dengan bantuan gas metana di dalam tubes yang terbuat dari material ASTM A351 Gr.CK20 menghasilkan reaksi senyawa gas hidrogen sulfida dan karbon disulfida. Selama proses operasi unit, terjadi interaksi antara fluida dengan material tubing yang menyebabkan terjadinya kombinasi korosi-erosi. Pada saat Furnace dishutdown, dilakukan kegiatan insitu metallografi pada tube furnace tersebut secara acak dan konvensional untuk menentukan ketahanannya (reliabilitasnya). Yakni dengan dilakukan pengukuran ketebalan tubing furnace, ditemukan adanya ketidakseragaman penipisan dinding tubing. Kerusakan ini disebabkan karena fluida (larutan asam) banyak mengandung kandungan sulfur yang tinggi dibuktikan dengan adanya proses penipisan yang terjadi pada dinding bagian dalam tubing, juga ditemukan adanya korosi intergranular dengan mudahnya terkelupas bagian inner wall tubing.
Metode penelitian yang dilakukan guna memberikan analisa mengenai jenis dan penyebab korosi pada tubing dengan memodelkan pada simulasi Computational Fluid Dynamic terkait distribusi kecepatan, tekanan, dan suhu yang mempengaruhi interaksi antara fluida dan material.. Metode uji SEM (Scanning Electron Microscope) dengan perbesaran 1500x, 3000x, 4500x, 6000x untuk mengetahui kondisi serta mengamati kemungkinan terjadinya korosi pada permukaan material dan perubahan mikrostrukturnya serta uji EDX (Energy Dispersive X-ray) umtuk mengetahui komposisi kimia dan karakteristik material yang mungkin terkait dengan korosi yang terkandung di dalam tubing Hasil penelitian menunjukkan bahwa penipisan dinding pipa terjadi tidak merata dengan konsentrasi kerusakan terbesar di bagian bawah, akibat suhu tinggi hingga 818 °C dan nilai turbulensi (TKE) melebihi 260 m²/s² berdasarkan simulasi CFD. Perbandingan corrosion rate antara simulasi dan perhitungan API 530 menunjukkan deviasi sebesar 14,23%, masih dalam batas wajar (<20%), sehingga valid untuk dijadikan acuan. Temuan ini diperkuat oleh hasil uji SEM-EDX yang mengindikasikan terjadinya korosi sulfidasi, intergranular, dan potensi stress corrosion cracking, serta perubahan komposisi kimia pada material, menegaskan adanya degradasi material akibat kondisi operasi========================================================================
The furnace is one of the equipment parts of the Carbon Disulfide Production in the Chemical Plant area which functions as a combustion furnace to heat sulfur with the help of methane gas in tubes made of ASTM A351 Gr.CK20 material to produce a compound reaction of hydrogen sulfide gas and carbon disulfide. During the operation of the unit, there is interaction between the fluid and the tubing material which causes a combination of corrosion-erosion. When the furnace is shutdown, insitu metallography is carried out on the furnace tube in a random and conventional manner to determine its reliability. Namely, by measuring the thickness of the furnace tubing, it was found that there was a non-uniform thinning of the tubing wall. This damage was caused by the fluid (acidic solution) containing a high sulphur content as evidenced by the thinning process that occurred on the inner wall of the tubing, as well as the presence of intergranular corrosion with easy peeling of the inner wall of the tubing. The research method carried out to provide an analysis of the types and causes of corrosion in tubing by modelling on Computational Fluid Dynamic simulations related to the distribution of velocity, pressure, and temperature that affect the interaction between the fluid and the material. SEM (Scanning Electron Microscope) test method with 1500x, 3000x, 4500x, 6000x magnification to determine the condition and observe the possibility of corrosion on the surface of the material and changes in its microstructure and EDX (Energy Dispersive X-ray) test to determine the chemical composition and material characteristics that may be related to corrosion contained in the tubing.
The research results indicate that pipe wall thinning occurs unevenly, with the highest concentration of damage occurring at the bottom, due to high temperatures of up to 818 °C and turbulence values (TKE) exceeding 260 m²/s² based on CFD simulations. A comparison of the corrosion rate between the simulation and API 530 calculations shows a deviation of 14.23%, which is still within acceptable limits (<20%), making it valid as a reference. This finding is supported by SEM-EDX test results indicating the occurrence of sulfidation corrosion, intergranular corrosion, and potential stress corrosion cracking, as well as changes in the chemical composition of the material, confirming material degradation due to operating conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ASTM A351, Furnace, Korosi-Erosi,ASTM A351, Furnace, Corrosion-Erosion
Subjects:	T Technology > T Technology (General) T Technology > T Technology (General) > TA404 Materials--Biodegradation T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TS Manufactures > TS161 Materials management. T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Adam Alzakky
Date Deposited:	08 Aug 2025 07:25
Last Modified:	08 Aug 2025 07:25
URI:	http://repository.its.ac.id/id/eprint/128018

Actions (login required)

View Item