Desain Riser Support Untuk Menghindari Vortex Induced Vibration (VIV) Pada Kasus Penggantian Rigid Riser Baru Pada Platform “X”

Putra, Ananda Andrea Suparno (2020) Desain Riser Support Untuk Menghindari Vortex Induced Vibration (VIV) Pada Kasus Penggantian Rigid Riser Baru Pada Platform “X”. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Riser merupakan komponen yang sangat penting yang menghubungkan jaringan pipa bawah laut dengan fasilitas di platform. Dalam mendesain atau melakukan penggantian pada riser, diperlukan perhitungan statis dan dinamis yang tepat dan teliti. Pemilihan tebal pipa serta peletakkan support atau clamp pada riser harus melewati seleksi serta perhitungan yang matang agar tidak terjadi kegagalan pada riser. Analisa statis mengacu pada ASME B31.4 dan API RP 1111 sedangkan analisa dinamis penentuan panjang bentangan bebas atau span yang diijinkan mengacu pada DNV RP F-105. Dari hasil analisis, riser aman terhadap tegangan kombinasi (von mises) yang terjadi berdasarkan ASME B31.4. Berdasarkan pemodelan dengan software Autopipe tegangan von mises terbesar yang terjadi adalah pada span 4 yaitu sebesar 42.27 MPa untuk kondisi kedalaman MSL dan sebesar 41.02 MPa untuk kondisi kedalaman pasang tertinggi. Masing-masing span pada riser memenuhi kriteria keamanan allowable span berdasarkan hasil screening criteria DNV RP F-105. Pada variasi tinggi gelombang untuk meemperoleh nilai tinggi gelombang yang menyebabkan struktur tidak memenuhi syarat rules akibat VIV. Diperoleh nilai tinggi gelombang sebesar 2.40 meter atau pada 1.2 kali tinggi gelombang desain yang dapat menyebabkan struktur tidak memenuhi syarat rules akibat VIV.================================================================================================== Riser is a very important component that connects subsea pipelines and facilities on platform. In designing or replacing risers, static and dynamic calculations with high accuracy and precision are needed. The selection of pipe wall thickness and the installation of riser clamps must pass any selection and detail calculation to avoid failure of the riser. Static analysis is refers to ASME B31.4 and API RP 1111 while the dynamic analysis to obtain the allowable span length refers to DNV RP F-105. From the results of the analysis, the riser is safe against combination stresses (von mises) refers to allowable stress criterion ASME B31.4. Based on modeling with the Autopipe software, the maximum value of von mises stress is occurs at span 4 with value of 42.27 MPa for water depth MSL condition and 41.02 MPa for water depth highest tides condition. Each of actual span on the riser is fulfill the allowable span criterion based on the results of screening criteria DNV RP F-105. The variations of wave height use to obtain the value of the wave height which cause the structure violate the requirements of codes due to VIV. Obtained the wave height with value of 2.40 meters or 1.2 times from the design wave height which can causes the structure violates the requirements of codes due to VIV.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: rigid riser, allowable span, variasi, allowable stress, arus, gelombang, vortex induced vibration, support, riser span, rigid riser, allowable span, allowable stress, current, wave, vortex induced vibration, support, riser span, variation
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Ananda Andrea Suparno Putra
Date Deposited: 13 Aug 2020 02:46
Last Modified: 13 Aug 2020 02:46
URI: http://repository.its.ac.id/id/eprint/77810

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