Ruviana, Rizqa (2020) Analisa Base Ring Stiffener pada Proses Erection Bejana Tekan Vertikal (Kasus: Plant Air Receiver Item C-335-01). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proses lifting & erection atau proses pengangkatan dan pemindahan pressure vessel (PV) harus dilakukan dengan aman agar tidak robek dan tertekuk. Pada pengangkatan PV vertikal dilakukan dengan memindahkan PV dengan posisi horizontal ke posisi vertikal. Posisi horizontal dilakukan saat fabrikasi dan pengiriman. Setelah sampai di site, proses selanjutnya dilakukan dengan merubah posisi horizontal menjadi vertikal.
Pada kasus ini, software compress digunakan untuk mendesain komponen pada proses lifting & erection. Namun Compress tidak dapat memunculkan hasil yang pasti, hanya mencakup opsi desain lug, termasuk tebal pelat dan base ring. Apabila komponen base ring yang di desain overstress, Compress akan memberi opsi untuk menambahkan komponen base ring stiffener (strut) tipe 2 poin pada bagian tengah base ring. Apabila desain masih belum diterima, maka penggunaan strut tipe lain dapat ditentukan dengan menghitung manual sesuai dengan acuan Pressure Vessel Design Manual oleh Dennis R.Moss (2004)
Perhitungan manual dilakukan dengan memodelkan free body diagram (FBD) pada sistem lifting & erection. Setelah didapatkan persamaan dari sistem, selanjutnya akan mendapat nilai pembebanan pada lug yang dihitung setiap sudut variasi 50. Load terbesar ini yang akan menjadi acuan untuk mendesain lifting lug, tailing lug, base ring, dan strut. Strut yang akan di desain dengan membandingkan tipe 2 poin, 3 poin dan 4 poin. Metode yang digunakan yaitu dengan menganalis beam pada masing-masing tipe strut. Desain ini juga akan divalidasi dengan simulasi menggunakan software Autodesk Inventor.
Hasil yang didapatkan dari penelitian ini adalah desain dengan tambahan strut 2 poin tidak diterima karena tegangan maksimum senilai 197,8 Mpa dibawah allowable stress senilai 186,2 Mpa. Selain itu didapatkan displacement maksimum terdapat pada ujun drain dengan nilai 5,143 mm. Desain dengan tambahan strut 3 dan 4 poin diterima karena tegangan maksimum senilai 126 Mpa dan 110,2 Mpa masih dibawah nilai allowable stress senilai 186,2 Mpa. Selain itu didapatkan displacement maksimum terdapat pada ujun drain dengan nilai 4,107 mm dan 4,086 mm. Kemudian dari ketiga desain, berdasarkan kesesuaian desain, cost dan perlakuan terhadap material, desain basering dengan tambahan strut 3 poin adalah desain paling efisien untuk pressure vessel item C-335-01.
Kata kunci : Pressure Vessel, Tailing Lug, Base Ring Stiffener (Strut), Base Ring
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The lifting & erection process must be done safely so as not to tear and bend. In this process, the PV is moved in a horizontal position to a vertical position. A Horizontal position is when fabricating and shipping. After arriving at the site, the next process is changing the horizontal into a vertical.
In this case, the Compress software is used to design components in the lifting & erection process. However, Compress software cannot give definitive results, only include lug design options, plate thickness, and base ring. If the base ring component is overstressed, the Compress software will give the option to add a base ring stiffener (strut) 2 point type component located in the middle of the base ring. If the design is still not accepted, then it must determine another type of strut with hand calculations according to the Pressure Vessel Design Manual Book by Dennis R. Moss (2004).
The first step in the manual calculation is to make a free body diagram (FBD) on the lifting & erection system. After getting the equation from the system, we will get the load value on the lug calculated for each 5- degree angle variation. This biggest load will be a reference for designing lifting lug, tailing lug, base ring, and strut. Strut variations used are type 2 points, 3 points, and 4 points. The method used is to analyze the beam on each type of strut. This design will also be validated by simulations using Autodesk Inventor software.
The results obtained from this research are an additional strut design with strut 2 point type is unaccepted with maximum stress 197.8 MPa. The maximum stress value is above the allowable stress value of 186,2 Mpa. In addition, the maximum displacement located at the end of the drain with a value of 5.143 mm. Design with additional strut 3 and 4 points are accepted because the maximum stresses of 126 Mpa and 110,2 Mpa are still below the allowable stress value of 186.2 Mpa. In addition, the maximum displacement located at the end of the drain with a value of 4,107 mm and 4,086 mm. Then from the three designs, based on the suitability of the design, cost, and treatment of the material, the base ring design with an additional strut 3 point type is the most efficient design for pressure vessel item C-335-01.
Keyword : Pressure Vessel, Tailing Lug, Base Ring Stiffener (Strut), Base Ring
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Pressure Vessel, Tailing Lug, Base Ring Stiffner (Strut), Base Ring. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design. T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA660.T34 Tanks. Pressure vessels T Technology > TS Manufactures > TS176 Manufacturing engineering. Process engineering (Including manufacturing planning, production planning) |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Rizqa Ruviana |
| Date Deposited: | 23 Aug 2020 02:44 |
| Last Modified: | 18 Jun 2023 14:10 |
| URI: | http://repository.its.ac.id/id/eprint/80245 |
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