STUDI ANALITIK VERTICAL DAN LATERAL BUCKLING PADA PIPELINE DENGAN METODE HOBBS

ROMADHONI, MUHAMMAD MAKKI (2017) STUDI ANALITIK VERTICAL DAN LATERAL BUCKLING PADA PIPELINE DENGAN METODE HOBBS. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Offshore pipeline merupakan jalur pipa yang berfungsi sebagai sistem pendistribusian minyak dan gas bumi. Selama beroperasi pipa akan menerima beban tekanan internal dan beban termal dari fluida atau gas yang dialirkan hingga pipa mengalami buckling baik vertikal maupun lateral. Analisa numerik vertikal maupun lateral buckling ini menggunakan metode Hobbs pada koefisien friksi tinggi dan koefisien friksi (0,3 ≤ ϕ ≤ 0,7) serta panjang buckling sebanyak 20 varian yang selanjutnya dilakukan perbandingan, dan juga perbandingan tegangan axial menggunakan DNV RP F110. Sehingga didapatkan hubungan kenaikan temperatur dengan panjang buckling dan amplitudo buckling. Data yang digunakan merupakan jaringan pipa gas Labuhan Maringgai-Muara Bekasi milik PT. Perusahaan Gas Negara (Persero) Tbk., diantaranya diameter luar pipa = 0,8128 m, tebal plat = 0,015875 m, koefisien ekspansi linear thermal = 11 x 10-6 m/oC, dll. Sehingga semakin tinggi koefisien friksi, temperatur meningkat hingga 13,4 %, panjang buckling berkurang hingga 13,4 %, dan tegangan axial (P0) meningkat hingga 12,95 %. Dalam perbandingannya, koefisien friksi tidak mempengaruhi panjang buckling pada vertical buckling. Hasil perbandingan dengan DNV RP F110, meningkatnya koefisien friksi akan meningkatkan tegangan axial (Seff) sebesar 0,00024 % dan hingga 13,4 % tegangan axial (P0) Hobbs. ======================================================================================================================== Offshore pipeline is a pipelines that serves as the distribution system of oil and gas. During operation, the pipeline will receive loads of internal pressure and thermal loads of fluid or gas are supplied until the pipes has been vertical or lateral buckling. This numerical analysis of vertical and lateral buckling usisng Hobbs method on a high friction coefficient and the coefficient of friction (0.3 ≤ φ ≤ 0.7) and also buckling length in 20 variants were will be comparisons, also axial pressures comparison using DNV RP F110. So we get the increase of temperature relation with the buckling lengths and buckling amplitude. The datas that used is a gas pipeline of Labuhan Maringgai-Muara Bekasi PT. Perusahaan Gas Negara (Persero) Tbk. That are, outer diameter of the pipe = 0.8128 m, plate thickness = 0.015875 m, coefficient of thermal linear expansion = 11 x 10-6 m / oC, etc. So if coefficient of friction is being higher, the temperature increase less than 13,4 %, the length of buckling decrease less than 13,4 %, and axial pressure increase less than 12,95 %. In those comparing, the coefficient of frictions does not affect to the lengths of buckling for the vertical buckling. The results of comparison with DNV RP F110, the increased of friction coefficients will increase axial pressure (Seff) to 0,00024 % and less than 13,4 % for Hobbs axial pressure (P0).

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Pipeline, Buckling, Hobbs Method, DNV RP F110, Koefisien Friksi, Metode Hobbs
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
T Technology > TS Manufactures > TS280 Pipe Bending, Tube Bending
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM293 Shipping--Indonesia--Safety measures
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: - MUHAMMAD MAKKI ROMADHONI
Date Deposited: 24 Jan 2017 07:43
Last Modified: 06 Mar 2019 04:06
URI: http://repository.its.ac.id/id/eprint/2894

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