Analisis Kekuatan Lokal Struktur Pipeline End Manifold (PLEM) Pada Konfigurasi Subsea Hose Jenis Chinese Lantern

Athallah, Adiv Gayu (2023) Analisis Kekuatan Lokal Struktur Pipeline End Manifold (PLEM) Pada Konfigurasi Subsea Hose Jenis Chinese Lantern. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Subsea hoses merupakan jenis marine hoses yang sangat rentan mengalami kegagalan. Diantara beragam konfigurasi subsea hoses, tipe chinese lantern cenderung lebih berisiko daripada tipe lainnya. Berbagai studi telah dilakukan untuk mengetahui pengaruh konfigurasi terhadap kekuatan subsea hoses, tetapi penelitian terkait pengaruh konfigurasi subsea hoses terhadap kekuatan pipeline end manifold (PLEM) belum pernah dilakukan. Oleh karena itu, penelitian ini melakukan studi kekuatan struktur PLEM terhadap variasi bentuk chinese lantern. Penelitian dilakukan dengan memodelkan subsea hoses pada konfigurasi catenary anchor leg mooring (CALM), dimana kapal diasumsikan dalam kondisi tertambat pada muatan full load dan ballast. Pembebanan yang dilakukan adalah kondisi ekstrem 100-tahunan. Langkah pertama penelitian adalah analisis dinamis sistem tambat untuk memastikan kekuatan rantai jangkar dan tali hawser. Selanjutnya, subsea hoses divariasikan dengan tiga bentuk chinese lantern untuk mengetahui gaya dan momen maksimum yang dihasilkan pada titik buoy dan PLEM. Kedua langkah tersebut disimulasikan selama 10.800 detik time-domain. Langkah terakhir, gaya dan momen tersebut, beserta tekanan dan gaya gravitasi, menjadi input pembebanan pada struktur lokal PLEM berdasarkan analisis metode elemen hingga. Struktur lokal yang dimodelkan ada dua variasi, yaitu struktur eksisting dan struktur tanpa spool. Hasil penelitian menunjukkan bahwa kekuatan sistem tambat telah memenuhi kriteria keamanan. Variasi bentuk hoses menunjukkan perubahan nilai gaya dan momen subsea hoses pada titik buoy dan PLEM. Namun demikian, perubahan dari kenaikan gaya dan momen hoses tidak berpengaruh signifikan terhadap tegangan von-mises maksimum pada PLEM. Penelitian ini juga menemukan bahwa internal pressure dan ketiadaan support-2 menjadi beban dan support paling kritis yang menentukan kekuatan struktur PLEM.
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Subsea hose is a type of marine hose that is very prone to failure. Among the various configurations of subsea hoses, the Chinese Lantern type tends to be more risky than the other types. Various studies have been conducted to determine the effect of configuration on the strength of subsea hoses, yet research related to the effect of configuration of subsea hoses on the strength of the pipeline end manifold (PLEM) has never been carried out. Therefore, this study conducted a study on the strength of PLEM structure with various shapes of Chinese Lanterns. The research was carried out by modeling subsea hoses in the catenary anchor leg mooring (CALM) configuration, where the ship is assumed to be moored at full load and ballast. The environment loading is a 100-year extreme condition. Firstly, dynamic analysis of the mooring system was done to ensure the strength of anchor chain and hawser lines. Then, the subsea hoses were varied with three shapes of Chinese Lanterns to analyze the maximum force and moment generated at the buoy and PLEM points. Both steps were simulated for 10,800 seconds time-domain. Finally, maximum hoses' forces and moments, along with pressure and gravity, became loading inputs to the PLEM local structure based on finite element analysis. There are two variations of the local structure model, which are the existing structure and the without-spool structure. The results showed that the strength of the mooring system met the safety criteria. The variations of hose shapes change maximum value of subsea hose' forces and moments at the buoy and PLEM points. However, the increasing of hoses' force and moment has no significant effect on the maximum von-mises stress in PLEM point. This study also found that internal pressure and the absence of support-2 are the most critical loads and support that determine the strength of the PLEM structure.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Subsea Hoses, Chinese Lantern, Pipeline End Manifold (PLEM), Buoyancy Modules
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method V Naval Science > VK > VK361 Mooring of ships. Dry docks V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	ADIV GAYU ATHALLAH
Date Deposited:	17 Jul 2023 06:52
Last Modified:	17 Jul 2023 06:52
URI:	http://repository.its.ac.id/id/eprint/98510

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