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Mustasyar Perkasa
Universitas Pamulang
Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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STRESS ANALYSIS SHROUD PLATE ORIFICE CHAMBER DENGAN METODE ELEMEN HINGGA Mustasyar Perkasa; Barkah Fitriyana; Wahyu Sulistiyo; Riski Pratama Mulyana
Jurnal Inovasi Ilmu Pengetahuan dan Teknologi Vol 1, No 2 (2020): Jurnal Inovasi Ilmu Pengetahuan dan Teknologi
Publisher : Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.591 KB) | DOI: 10.32493/jiptek.v1i2.6224

Abstract

Abstrak: Terjadinya keretakan pada sambungan las shroud plate maka hot gases yang bersuhu 750 °Cakan mengalir keluar dari area dalam shroud plate ke area dinding orifice chamber, sehingga perlu dilakukan penambahan box high density refractory eksternal orifice chamber pada sisi luar dari orifice chamber. Penguatan sambungan las dengan menggunakan stiffener dan penambahan box high density refractory eksternal orifice chamber ini yang harus diperhitungkan dalam segi kekuatan strukturnya menggunakan finite elemen analisys (FEA). Pada penelitian dilakukan finite elemen analysis (FEA) pemasangan stiffener plate pada shroud plate untuk menentukan jumlah kebutuhan stiffener yang dibutuhkan dan pemasangan box high density refractory eksternal orifice chamber terkait dengan penambahan beban spring support. Material shroud plate adalah baja karbon sesuai dengan ASTM grade SA 240 TP 304H, sedangkan material penguat adalah SA 240 TP 304. Hasil pemeriksaan menunjukkan bahwa shroud plate mengalami retak yang diakibatkan oleh korosi. Dari perhitungan FEA, maka estimasi  jumlah stiffener plate yang dibutuhkan sekitar 107 buah, atau apabila menggunakan model penguat patching berjumlah 7 buah.  Pemasangan box pada dinding orifice chamber akan mengakibatkan permukaan luar orifice chamber tidak mendapatkan pendinginan alami dari udara luar sehingga suhu pada dinding orifice yang dipasang box tidak turun ke 325 0C. Orifice chamber terbuat dari material carbon steel SA 516 TP 70 yang hanya mampu menahan beban temperatur hingga 538 °C sehingga apabila terpapar beban temperatur hingga 750 0C maka material akan failed.Kata Kunci: orifice chamber, shroud plate, box high density, FEM  
ANALYSIS OF THE STRUCTURAL INTEGRITY OF A FUEL TANK DUE TO BUCKLING USING THE FINITE ELEMENT METHOD Hendri Septian; Mustasyar Perkasa
TOPLAMA Vol. 3 No. 3 (2026): TOPLAMA
Publisher : PT Altin Riset Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61397/tla.v3i3.503

Abstract

Storage tanks for fuel oil are commonly used in the oil, gas, and petrochemical industries. These tanks typically have thin-walled structures that are susceptible to buckling under excessive pressure. A hydrostatic test is required to determine the structural strength of the tank and to check for any leaks or cracks in the shell course. During the hydrostatic test, special attention must be given to the dewatering process to avoid excessive pressure differences inside and outside the tank that could lead to buckling. In this study, the tank experienced buckling in the shell course due to errors during the dewatering process, resulting in out-of-roundness in the affected shell course that exceeded the API 650 standard, with a maximum deviation of ±25 mm (from 45 m to <75 m). This thesis analyzes the causes of buckling in the tank shell course and provides recommendations for appropriate repairs so that the tank can be put back into service. NDT UT was carried out to ensure that the shell course thickness remains within the acceptable range, and NDT MPI was conducted to confirm the absence of discontinuities in the shell course welds. Based on the actual buckling condition observed in the field, repairs are recommended. For the buckling area, the use of temporary strong backs is suggested. This method is applied for the fit-up of horizontal and vertical joints. In addition, the installation of a stiffening ring is necessary to restore the tank roundness in compliance with API 650 standards. The material used for the stiffening ring is angle steel 100 × 90 × 7t.
Co-Authors Barkah Fitriyana Hendri Septian Riski Pratama Mulyana Wahyu Sulistiyo