Prawira, Muhammad Dicky Agus (2026) Analisa Aliran Fluida pada Bagian Suction Pipa Pompa Sentrifugal Menggunakan Simulasi CFD untuk Mengidentifikasi Vibrasi dan Kavitasi Akibat Penggunaan Strainer. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pompa sentrifugal pada sistem cooling water berperan penting dalam menjaga kontinuitas proses industri. Penggunaan strainer pada sisi suction berfungsi melindungi pompa dari partikel padat, namun dapat meningkatkan hambatan aliran yang menyebabkan pressure drop, turbulensi, peningkatan vibrasi, dan gangguan hidraulik. Penelitian ini bertujuan menganalisis pengaruh penggunaan strainer terhadap karakteristik aliran fluida, vibrasi, dan indikasi gangguan hidraulik pada pompa sentrifugal menggunakan pendekatan Computational Fluid Dynamics (CFD). Penelitian dilakukan melalui pengukuran vibrasi menggunakan SKF Vibrometer dan tekanan menggunakan pressure gauge pada kondisi menggunakan strainer serta setelah penggantian dengan pipa lurus DN350. Analisis vibrasi dilakukan menggunakan metode Fast Fourier Transform (FFT), sedangkan simulasi CFD menggunakan ANSYS Fluent untuk mengevaluasi distribusi pressure, velocity, dan streamline pada sisi suction. Hasil simulasi divalidasi menggunakan data vibrasi, FFT, dan evaluasi Net Positive Suction Head (NPSH). Hasil penelitian menunjukkan nilai rata-rata vibrasi menurun dari 5,46 mm/s menjadi 2,87 mm/s setelah penggantian strainer. Berdasarkan ISO 10816, kondisi vibrasi berubah dari dominasi kategori Danger menjadi didominasi kategori Normal dengan beberapa titik masih berada pada kategori Alert. Simulasi CFD menunjukkan penggunaan strainer menyebabkan peningkatan pressure drop, turbulensi, dan pembentukan vortex yang mengakibatkan distribusi aliran tidak seragam. Analisis FFT menunjukkan adanya broadband vibration dan spectral hump yang mengindikasikan gangguan hidraulik menyerupai fenomena kavitasi. Perhitungan NPSH menunjukkan nilai NPSHₐ sebesar 7,96 m lebih besar dibandingkan NPSHᵣ sebesar 5,50 m sehingga secara teoritis pompa masih aman terhadap kavitasi. Namun, hasil CFD dan FFT menunjukkan adanya penurunan tekanan lokal serta ketidakstabilan aliran yang berpotensi menyebabkan localized cavitation pada area tertentu. Penggantian strainer dengan pipa lurus DN350 mampu memperbaiki distribusi aliran serta menurunkan vibrasi pompa.
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Centrifugal pumps in cooling water systems play an important role in maintaining industrial process continuity. The use of a strainer on the suction side protects the pump from solid particles; however, it can increase flow resistance, causing pressure drop, turbulence, increased vibration, and hydraulic disturbances. This study aims to analyze the effect of strainer installation on fluid flow characteristics, vibration, and indications of hydraulic disturbances in a centrifugal pump using a Computational Fluid Dynamics (CFD) approach. The research was conducted through vibration measurements using an SKF Vibrometer and pressure measurements using a pressure gauge under two conditions: with a strainer and after replacement with a DN350 straight pipe. Vibration analysis was performed using the Fast Fourier Transform (FFT) method, while CFD simulations using ANSYS Fluent were carried out to evaluate the distribution of pressure, velocity, and streamlines on the suction side. Validation was performed using vibration data, FFT analysis, and Net Positive Suction Head (NPSH) evaluation. The results showed that the average vibration decreased from 5.46 mm/s to 2.87 mm/s after replacing the strainer. According to ISO 10816, the vibration condition changed from a predominantly Danger category to predominantly Normal, with several measurement points remaining in the Alert category. CFD results showed that the strainer increased pressure drop, turbulence, and vortex formation, resulting in non-uniform flow distribution. FFT analysis revealed broadband vibration and spectral hump characteristics, indicating hydraulic disturbances similar to cavitation phenomena. The NPSH calculation showed that NPSHₐ of 7.96 m was higher than NPSHᵣ of 5.50 m, indicating that the pump was theoretically safe against cavitation. However, CFD and FFT results revealed local pressure reduction and flow instability that could potentially cause localized cavitation in certain areas. Replacing the strainer with a DN350 straight pipe improved flow distribution and reduced pump vibration.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Computational Fluid Dynamics (CFD), Fast Fourier Transform (FFT), kavitasi, pompa sentrifugal, strainer.Computational Fluid Dynamics (CFD), cavitation, centrifugal pump, Fast Fourier Transform (FFT), strainer. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration. T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TJ Mechanical engineering and machinery > TJ919 Centrifugal pumps--Design and construction. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Muhammad Dicky Agus Prawira |
| Date Deposited: | 31 Jul 2026 02:21 |
| Last Modified: | 31 Jul 2026 02:21 |
| URI: | http://repository.its.ac.id/id/eprint/140417 |
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