PRATAMA, AJIEYUDHA (2025) ANALISIS PENGARUH TEKANAN FLUIDA TERHADAP KEKUATAN PERANCANGAN BALL VALVE MENGGUNAKAN METODE ELEMEN HINGGA (FEA). S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Several simulations of ball valves using the finite element method have been conducted in various studies. However, there are still some shortcomings, such as coarse mesh quality and a lack of comparisons between simulation results and validation tests. This research aims to simulate the strength of a 4-inch class 1500 ball valve with a working pressure of 20.68 MPa at ambient temperature to analyze maximum stress, maximum deformation, and safety factor under two different operating conditions: open and closed. The methods employed include theoretical calculations, simulations using ANSYS Workbench 2024 R2, and hydrostatic testing for validation. The simulation results indicate a maximum stress of 277.39 MPa and a maximum deformation of 0.11205 mm under the closed condition. In the open condition, the maximum stress is 18.696 MPa, with a maximum deformation of 0.0072238 mm. The minimum safety factor is 1.0923 under the closed condition, which still meets safety criteria. The maximum stress on the seat insert contact is 35.795 MPa, with a maximum deformation of 0.091 mm, both showing a deviation of less than 2.1% compared to theoretical calculations (36.55 MPa and safety factor of 3.009). Validation tests, including hydrostatic seat tests and hydrostatic shell tests, revealed no leakage or significant deformation after testing at pressures of 22.75 MPa and 31.02 MPa with a holding time of 2 minutes. Keywords: ball valve, fluid pressure, theoretical calculations, finite element, simulation, maximum stress, maximum deformation, safety factor, seat insert contact, validation tests Beberapa simulasi ball valve menggunakan metode elemen hingga telah dilakukan dalam berbagai penelitian selama ini. Namun, masih terdapat beberapa kekurangan seperti kualitas mesh yang terlalu kasar dan kurangnya perbandingan antara hasil simulasi dengan tes validasi. Penelitian ini bertujuan untuk melakukan simulasi pada kekuatan ball valve berukuran 4 inci kelas 1500 dengan tekanan kerja 20,68 MPa pada suhu lingkungan untuk menganalisis tegangan maksimum, deformasi maksimum, dan safety factor pada dua kondisi operasi yang berbeda, yaitu kondisi terbuka dan tertutup. Metode yang digunakan meliputi perhitungan teoritis, simulasi menggunakan ANSYS Workbench 2024 R2, serta pengujian hidrostatis untuk validasi. Hasil simulasi menunjukkan tegangan maksimum sebesar 277,39 MPa dan deformasi maksimum 0,11205 mm pada kondisi tertutup. Pada kondisi terbuka tegangan maksimum sebesar 18,696 MPa dan deformasi maksimum 0,0072238 mm. Safety factor minimum sebesar 1,0923 pada kondisi tertutup yang masih memenuhi kriteria keamanan. Tegangan maksimum pada kontak seat insert adalah 35,795 MPa dengan deformasi maksimum 0,091 mm, keduanya menunjukkan selisih kurang dari 2,1% dibandingkan perhitungan teoritis (36,55 MPa dan safety factor 3,009). Tes validasi hydrostatic seat test dan hydrostatic shell test menunjukkan tidak adanya kebocoran atau deformasi signifikan setelah pengujian pada tekanan uji 22,75 MPa dan 31,02 MPa dengan holding time selama 2 menit. Kata kunci: ball valve, tekanan fluida, perhitungan teoritis, elemen hingga, simulasi, tegangan maksimum, deformasi maksimum, safety factor, kontak seat insert, tes validasi
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