Simulasi CFD Terjadinya Kavitasi Pada Katup Kontrol Muatan Liquid Caustic Soda

Pratama, Reza Aji Nur (2022) Simulasi CFD Terjadinya Kavitasi Pada Katup Kontrol Muatan Liquid Caustic Soda. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam kehidupan sehari-hari, korosi dapat kita jumpai terjadi pada berbagai jenis logam, salah satu jenis korosi yang menyebabkan kerugian adalah korosi kavitasi. Kavitasi adalah bentuk khusus korosi erosi yang disebabkan oleh pembentukan dan pecahnya gelembung-gelembung uap di permukaan logam. Korosi kavitasi tersebut disebabkan karena terbentuknya gelembung air pada pipa karena perbedaan tekanan. Ada banyak hal yang bisa menyebabkan munculnya kavitasi seperti besarnya penurunan tekanan dan turunnya tekanan mencapai tekanan uap. Penelitian ini membuat simulasi aliran 3 dimensi pada katup kontrol dengan menggunakan ball valve serta dialiri fluida jenis caustic soda dengan 4 variasi prosentase bukaan katup yaitu 30%, 50%, 70%, dan 100%. Didapatkan daerah kavitasi yang ditampakkan dalam kontur distribusi tekanan dan kecepatan aliran, sedangkan pemeriksaan kavitasi dihitung dengan perhitungan teoritis Hasil dari penelitan memperoleh rekomendasi atau saran mengenai tindakan yang harus dilakukan jika katup kontrol terkena kavitasi yaitu dapat dengan menambahkan instrumen orifice plate. Penambahan plat orifice cocok digunakan untuk menurunkan tekanan dan kecepatan aliran fluida. Pada tekanan masuk 65 psi penambahan orifice hanya sedikit berpengaruh pada pengurangan intensitas terjadinya kavitasi. Pada bukaan 30% dan 50% terjadi perubahan kontur dari biru tua dengan nilai antara 0,000568 – 0.101 menjadi biru muda dengan nilai 0.201 – 0.401, serta peluasan kontur berwarna hijau dengan nilai antara 0.501 – 0.601 yang menandakan bahwa sedikit perubahan fase yang terjadi. Sedangkan pada bukaan 70% kontur terjadinya kavitasi memang berkurang hanya saja kontur kavitasi berpindah ke dalam ball sheet.
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We can find corrosion that occurs in various types of metal, one type of corrosion that causes losses is cavitation corrosion. Cavitation is a special form of erosional corrosion caused by the formation and bursting of vapor bubbles on a metal surface. Cavitation corrosion is caused by the formation of water bubbles in the pipe due to pressure differences. Many things can cause cavitation such as the magnitude of the pressure drop and the drop in pressure reaching the vapor pressure. This research makes a 3-dimensional flow simulation on the control valve using a ball valve and flowing with caustic soda-type fluid with 4 variations in the percentage of valve openings, namely 30%, 50%, 70%, and 100%. The cavitation area is found which is shown in the pressure distribution contour and flow velocity, while the cavitation examination is calculated by theoretical calculations. The results of the research are recommendations or suggestions regarding actions to be taken if the control valve is exposed to cavitation, namely by adding an orifice plate instrument. The addition of an orifice plate is suitable for reducing the pressure and fluid flow velocity. At the inlet pressure of 65 psi, the addition of the orifice has only a slight effect on reducing the intensity of cavitation. At 30% and 50% openings there is a change in the contour from dark blue with a value between 0.000568 – 0.101 to light blue with a value of 0.201 – 0.401, as well as an expansion of the green contour with a value between 0.501 – 0.601 which indicates that a slight phase change occurred. Meanwhile, at 70% aperture, the cavitation contour is reduced, but the cavitation contour moves into the ball sheet.

Item Type:	Thesis (Other)
Additional Information:	RSSP 629.256 Pra s-1 2022
Uncontrolled Keywords:	Korosi Kavitasi, Ball Valve, Penurunan Tekanan, Orifice Plate, Cavitation, Ball Valve, Pressure Drop, Orifice Plate.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	20 Apr 2026 05:22
Last Modified:	20 Apr 2026 05:22
URI:	http://repository.its.ac.id/id/eprint/132804

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