Analisa Tegangan Pipa Bawah Laut pada Proses Instalasi Akibat Gerakan Lay Barge dengan Metode S-Lay

S, IB MD Addy Purnama (2007) Analisa Tegangan Pipa Bawah Laut pada Proses Instalasi Akibat Gerakan Lay Barge dengan Metode S-Lay. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 4302100036-Undergraduate_Thesis.pdf - Accepted Version Download (11MB)

Abstract

Respon struktur Lay Berge akibat eksitasi gelombang akan mempengaruhi tegangan pipa pada saat instalasi. Untuk mencegah terjadinya tegangan berlebih yang akan berakibat pada kegagalan, maka dibutuhkan tensioner sebagai pemberi tension terhadap pipa guna menjaga bentuk pipa (catenary shape). Pada penelitian ini. Akan dibahas mengenai gerakan Lay Barge apa yang paling berpengaruh terhadap tegangan pipa pada metode S-Lay. Penelitian ini menggunkan software Orcaflex yang berbasis analisa time domain untuk pemodelan dinamisnya Simulasi pada penelitian ini dilakukan selama 10 menit. Sturktur Lay Barge yang digunakan adalah CASTORO II milik Saipem, dengan material pipa grade X-65 berdiameter 26 inc~ konfigurasi mooring 30<J sebanyak 8 buah dan panjang stinger yang digunakan sepanjang 30 m dengan sudut datang 13,6°. Hasil penelitian ini didapatkan bahwa titik kritis terjadinya tegangan tebesar adalah 31.25 m dari ujung stem barge pada daerah overbend sebesar 136384 kN/m2 . Dan gerakan tunggal yang memiliki kontribusi terbesar terhadap tegangan pipa adalah gerakan pitch sebesar 98.56 %, dengan distribusi statistik lognormal untuk variasi tegangan..
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The response of a Lay Barge structure induced by wave excitation will influence the stresses of pipe during the installation process. To prevent the over stress which is consequence to failure, therefore it needed a tensioner machine to give tension for maintaining a catenary shape. The aim of this research is to know the most influence of the motion on the Lay Barge which will produce the maximum bending stress on the pipe using the S-Lay method. This research performed by Orcaflex software based on time domain for the dynamic modelling. The simulation has been taken about 10 minutes. Lay Barge structure CASTORO II provided by Saipem, material grade X-65 and 26 inch OD for the pipe, mooring configuration at 30° for 8 lines and the length of stinger is about 30m with depature angel 13,6° has been used in this research. The result of this research are: the critical point is at 31.25 m from the end of stem barge at the overbend region with a value about 136384 kN/m2 • And the single motion which gives the significant contribution is pitch about 98.56 %~ with statistic distribution lognormal for its various stresses.

Item Type:	Thesis (Other)
Additional Information:	RSKe 665.544 Ibm a-1 2007
Uncontrolled Keywords:	tegangan bending, time domain, lay barge, pitch; S-Lay,bending stress, time domain, lay barge, pitch, S-Lay
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) > TA660.P55 Underground pipeline design, construction and management
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Totok Setiawan
Date Deposited:	19 Oct 2023 01:02
Last Modified:	19 Oct 2023 01:02
URI:	http://repository.its.ac.id/id/eprint/104974

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