Nugroho, Septyan Wahyu (2021) Analisis Kekuatan Lazy Wave Flexible Riser Dengan Konfigurasi Internal Turret Mooring FPSO Pada Kondisi Tandem Offloading Berbasis Time Domain. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Selama beberapa dekade, flexible riser telah menjadi solusi teknologi dalam berbagai kegiatan eksplorasi minyak dan gas di laut dangkal maupun laut dalam. Flexible riser merupakan salah satu fasilitas produksi yang menghubungkan fasilitas struktur apung dengan subsea wells. FPSO dengan konfigurasi internal turret mooring kerap menjadi pilihan, karena kemampuannya menyesuaikan dengan arah kondisi beban lingkungan (weathervaning). Respon gerak FPSO dengan berbagai skenario dan kondisi muatan dapat menjadi faktor utama terhadap kekuatan flexible riser. Tegangan maksimum dan minimum bending radius (MBR) dari flexible riser menjadi aspek tinjauan. Penelitian ini membahas mengenai respon kekuatan flexible riser bertipe lazy wave. Sistem tali tambat FPSO berupa internal turret mooring dengan konfigurasi mooring legs 9 lines yang terbagi dalam 3 grouping. Analisis akan melihat dua skenario berbeda. Pertama, skenario ekstrem (FPSO) stand alone dengan muatan full load dan ballast. Kedua, skenario operasi saat FPSO melakukan tandem offloading dengan Shuttle tanker dengan muatan FPSO (full load)—Shuttle tanker (ballast) dan FPSO (ballast)—Shuttle tanker (full load). Analisis kekuatan lazy wave flexible riser ini akan dilakukan dengan berbasis ranah waktu (time domain). Dari hasil analisis diketahui bahwa pada skenario ekstrem, tegangan maksimum terbesar flexible riser bernilai 153,93 kN dan MBR bernilai 5,17 meter terjadi saat kondisi muatan ballast. Sedangkan pada kondisi operasi, tegangan maksimum terbesar bernilai 121,27 kN saat kondisi muatan FPSO (ballast)—Shuttle tanker (full load) dan MBR bernilai 5,05 meter saat kondisi muatan FPSO (full load)—Shuttle tanker (ballast).
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For decades, flexible risers have been a technological solution in various oil and gas exploration activities in both shallow and deepwater. Flexible riser is a production facility that connects floating structure facilities with subsea wells. FPSO with internal turret mooring configuration is often the choice, because of its ability to adjust to the direction of environmental load conditions (weathervaning). The motion response of the FPSO with various scenarios and loading conditions can be a major factor in the strength of the flexible riser. The maximum tension and minimum bending radius (MBR) of the flexible riser are aspects of the study. This study discusses the responsiveness of the lazy wave flexible riser. The FPSO mooring system consists of an internal mooring turret with 9 lines mooring legs configuration which is divided into 3 groupings. The analysis will look at two different scenarios. First, the stand alone extreme scenario (FPSO) with full load and ballast. Second, the operating scenario when FPSO is connected to Shuttle tanker with FPSO (full load)—Shuttle tanker (ballast) and FPSO (ballast)—Shuttle tanker (full load). The lazy wave flexible riser strength analysis will be carried out on a time domain basis. From the results of the analysis, it is known that in extreme scenario, the maximum maximum tension of the flexible riser is 153,93 kN and the MBR is 5,17 meters with the ballast load conditions. Meanwhile, under operating conditions, the maximum tension is 121.27 kN when the load condition is FPSO (ballast)—Shuttle tanker (full load) and MBR is 5,05 meters when the load is FPSO (full load)—Shuttle tanker (ballast).
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