Analisa Tegangan Dinamis Lazy Wave Flexible Riser Dengan Variasi Diameter Dan Konfigurasi Buoyancy Modules Pada Kondisi Ekstrim

Farhan, Muhammad (2021) Analisa Tegangan Dinamis Lazy Wave Flexible Riser Dengan Variasi Diameter Dan Konfigurasi Buoyancy Modules Pada Kondisi Ekstrim. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Produksi minyak dan gas di fasilitas lepas pantai terapung semakin berkembang. Hal ini mendorong perancangan flexible riser sebagai salah satu solusi untuk menyalurkan hasil eksplorasi dari wellhead ke fasilitas lepas pantai terapung. SPM merupakan salah satu media bagi fasilitas lepas pantai terapung sebagai fasilitas offloading dimana flexible riser menghubungkan antara wellhead dan SPM. Namun pada saat kondisi ekstrim fasilitas lepas pantai terapung tidak boleh tertambat ke SPM. Salah satu konfigurasi flexible riser yang sering digunakan adalah lazy wave, dimana di sepanjang flexible riser akan ditambahkan buoyancy module. Respon gerak SPM, diameter flexible riser, dan jumlah buoyancy module pada flexible riser akan sangat mempengaruhi tegangan dinamis dari flexible riser. Penelitian ini membahas mengenai maximum tension dan minimum bending radius (MBR) akibat variasi diameter dan jumlah buoyancy module pada flexible riser pada kondisi ekstrim dengan dua kondisi sistem, yaitu intact dan damage. Dari hasil analisa, semakin besar diameter flexible riser maka maximum tension pada titik SPM akan semakin besar, sedangkan akan semakin kecil pada titik PLEM dan semakin banyak buoyancy module yang digunakan makan akan semakin kecil maximum tension pada titik SPM, sedangkan akan semakin besar pada titik PLEM. Semakin besar diameter flexible riser maka akan semakin kecil MBR pada area SagBend, sedangkan akan semakin besar pada area HogBend dan semakin banyak buoyancy module yang digunakan maka akan semakin besar MBR pada area SagBend, sedangkan akan semakin kecil pada area HogBend.
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Oil and gas production at floating offshore facilities is growing. This matter prompted the design of flexible riser as one of the solutions to channel exploration result from wellhead to floating offshore facilities, where. SPM is one of the system used by the floating offshore facilities as an offloading facilities, where a flexible riser connects the wellhead to the SPM . However in extreme conditions, floating offshore facilitites can not be moored to the SPM. One of the flexible riser configuration that is often used is lazy wave, where buoyancy module are added along a longer length of the flaexible riser. SPM motion response, flexible riser diameter, and the number of buoyancy modules on the flexible riser will greatly affect the dynamic tension of the flexible riser. This study discusses the maximum tension and minimum bending radius (MBR) due to variations in diameter and number of buoyancy modules on flexible risers in extreme conditions with two system conditions, intact and damage. From the results of the analysis, the larger the diameter of the flexible riser, the larger the maximum tension at the SPM point, while the smaller at the PLEM point and the more buoyancy modules used, the smaller the maximum tension at the SPM point, while the larger at the PLEM point. The larger the diameter of the flexible riser, the smaller the MBR in the SagBend area, while the larger at the HogBend area and the more buoyancy modules used, the larger the MBR in the SagBend area, while the smaller at the HogBend area.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Flexible Riser, Lazy Wave, Maximum Tension, Minimum Bending Radius
Subjects:	T Technology > T Technology (General) T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Farhan
Date Deposited:	24 Aug 2021 01:50
Last Modified:	24 Aug 2021 01:50
URI:	http://repository.its.ac.id/id/eprint/89207

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