Analisis Dinamis Stabilitas Lateral Pipa Bawah Laut Pada Kondisi Operasi

Akbar, Soni Fachryan (2024) Analisis Dinamis Stabilitas Lateral Pipa Bawah Laut Pada Kondisi Operasi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam analisa kestabilan pipa bawah laut mengacu pada DNVGL RP F109 (On-bottom Stability Design of Submarine Stability Design of Submarine) dan DNVGL RP F114 (Pipe Soil Interaction) tahun 2017, untuk stabilitas lateral terdapat 3 metode analisis yang dapat diterapkan, yaitu metode stabilitas lateral umum (GLS), metode stabilitas statis lateral absolut (ALSS) dan metode stabilitas lateral dinamis (DLS). Pemilihan metode analisis ini tergantung pada tingkat kerincian hasil analisis yang akan diperlukan dalam analisis desain. Analisis dengan metode dinamis memberikan persyaratan yang lebih kompleks dimulai dari segi perhitungan (numerical approach) dan juga kondisi lapangan, seperti memperhatikan gerak respons pipa terhadap kombinasi beban hidrodinamis (hidrodynamic loads) dari gelombang acak (random waves), arus (steady state) dan hambatan tanah (soil resistance) dengan time domain guna mensimulasikan hasil yang aktual pada kondisi ekstrem. Hasil dari studi kali ini menunjukkan gaya hidrodinamis yang dianalisis menggunakan perhitungan numerik pada software CFD dapat dibandingkan dengan analisa analitik sesuai DNV GL F109 dan F114 yang mendapat nilai dengan tingkat error <10%. Nilai Maximum Lateral Displacement mencapai 1.5164 mm (memenuhi kriteria rentang allowable displacement 0.5 – 10 x OD pipeline sesuai dengan DNV GL F109 & DNVGL F114). Nilai Von Mises Stress sepanjang pipa mencapai 156.44 MPa (memenuhi Kriteria 90% SMYS pada ASME B31.8). Terakhir, metode analisis dinamis ini dapat secara langsung mengetahui besaran peripindahan lateral dan stress yang dialami pipa dan memenuhi standar dan kode yang berlaku sekaligus mengkoreksi hasil dari metode konvensional.
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In analyzing the stability of underwater pipelines, reference is made to DNVGL RP F109 (On-bottom Stability Design of Submarine Pipelines) and DNVGL RP F114 (Pipe Soil Interaction) from 2017. For lateral stability, three analysis methods can be applied: the General Lateral Stability (GLS) method, the Absolute Static Lateral Stability (ALSS) method, and the Dynamic Lateral Stability (DLS) method. The choice of analysis method depends on the level of detail required in the design analysis. Dynamic analysis imposes more complex requirements, involving numerical calculations and field conditions such as considering the pipe's response to hydrodynamic loads from random waves, steady currents, and soil resistance in the time domain to simulate actual extreme conditions. The results of this study indicate that hydrodynamic forces analyzed using numerical calculations in CFD software can be compared with analytical analyses according to DNV GL F109 and F114, achieving an error level of <10%. The Maximum Lateral Displacement reaches 1.5164 mm (within the allowable displacement range of 0.5 – 10 x OD pipeline as per DNV GL F109 & DNVGL F114). The Von Mises Stress along the pipeline reaches 156.44 MPa (meeting the 90% SMYS criterion in ASME B31.8). Lastly, this dynamic analysis method directly assesses the lateral displacement and stress experienced by the pipe, aligning with applicable standards and codes while correcting results from conventional methods.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Stabilitas Pipa, Perpindahan Lateral, Domain Waktu, Pipeline Stability, Lateral Displacement, Time Domain
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Soni Fachryan Akbar
Date Deposited:	18 Jul 2024 04:40
Last Modified:	18 Jul 2024 04:40
URI:	http://repository.its.ac.id/id/eprint/108431

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