Analisis On-Bottom Stability Dan Lateral Buckling: Studi Kasus Gas Injection Line Dari Platform LCOM Menuju Platform LLB

Andhika, Afris Tri (2020) Analisis On-Bottom Stability Dan Lateral Buckling: Studi Kasus Gas Injection Line Dari Platform LCOM Menuju Platform LLB. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada penggunaan pipa bawah laut, stabilitas di dasar laut menjadi hal yang harus diperhatikan. Selain itu pada pipa yang hanya meletak pada seabed dan beroperasi dalam kondisi temperature dan pressure yang tinggi sangat berpotensi untuk mengalami buckling. Pada penelitian ini, dilakukan analisis terhadap stabilitas 8” Gas Injection Line berdasarkan standar DNVGL RP F109 dan juga lateral buckling berdasarkan standar DNV RP F110. Analisis stabilitas yang dilakukan meliputi analisis stabilitas vertikal dan lateral. Analisis lateral buckling memastikan agar gaya aksial efektif pipa tidak melebihi gaya aksial mode infinite metode Hobbs. Berdasarkan standar yang digunakan, pipa bawah laut dapat dikatakan stabil apabila memiliki nilai design criteria kurang dari atau sama dengan satu baik secara vertikal maupun lateral. Dari hasil analisis diketahui bahwa nilai design criteria untuk stabilitas vertikal adalah 0,492. Besar nilai design criteria stabilitas lateral pada kriteria absolute static adalah 1,44 sedangkan pada kriteria generalized lateral static adalah 1,2 untuk 0,5D dan 0,59 untuk 10D. Hasil analisis stabilitas lateral menunjukan pipa bawah laut tidak memenuhi kriteria absolute static dan generalized 0,5D tetapi memenuhi kriteria 10D. Dari analisis didapatkan bahwa pipa bergerak sebesar 36,05 cm secara lateral. Dari pemodelan software didapatkan pergerakan pipa secara lateral sebesar 36,8 cm. Error hasil perhitungan manual dan simulasi software sebesar 2,17%. Berdasarkan analisis buckling menunjukkan bahwa tidak akan mengalami buckling, karena eksternal pressure yang bekerja pada pipa kurang dari collapse pressure pipa dan juga pipa tidak mengalami lateral buckling. ==================================================================================================================== In the use of subsea pipeline, stability on the seabed becomes a matter that must be considered. Pipeline that are only laying on the seabed and operating in high temperature and pressure conditions, it is potentially to experience buckling. In this research, conducted analysis on the stability of 8” Gas Injection Line based on standard DNVGL RP F109 and also lateral buckling based on standard DNV RP F110. The stability analysis carried out includes vertical and lateral stability analysis. Lateral buckling analysis ensures that the effective axial force of the pipe doesn’t exceed the Hobbs infinite mode axial force. Based on the standard used, subsea pipeline can be said to be stable when it has a design criteria value less than or equal to one either vertically or laterally. From the analysis results, it is known that the design criteria value for vertical stability is 0.492. The value of design criteria of the lateral stability for the absolute static criteria is 1.44 while the generalized lateral static criteria are 1.2 for 0, 5D and 0.59 for 10D. The results of the lateral stability analysis indicate that the subsea pipeline doesn’t fulfill the absolute static and generalized 0,5D criteria but fulfill the 10D criteria. From the analysis it was obtained that the subsea pipe move 36,05 cm laterally. From the software modeling acquired a lateral pipe movement of 36,8 cm. Manual calculation result errors and software simulations of 2,17%. Based on buckling analysis indicates that it will not experience buckling, due to external pressure that works on pipes less than collapse pressure of pipe and lateral buckling will not occur.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: pipa bawah laut, on-bottom stability, lateral buckling, DNVGL RP F109, DNV RP F110
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
T Technology > TN Mining engineering. Metallurgy > TN879.5 Petroleum pipelines
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Afris Tri Andhika
Date Deposited: 13 Aug 2020 03:18
Last Modified: 13 Aug 2020 03:18
URI: https://repository.its.ac.id/id/eprint/77924

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