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ITS » Undergraduate Theses » Teknik Kelautan
Posted by hassane at 25/11/2008 16:20:24  •  6704 Views


ANALISA TEGANGAN PIPA BAWAH LAUT PADA PROSES INSTALASI AKIBAT GERAKAN LAY BARGE DENGAN METODE S-LAY

SUBSEA PIPELINE STRESS ANALYSIS AT INSTALLATION PROCESS INDUCED BY LAY BARGE MOTION USING THE S-LAY METHOD

Author :
S, IB MD Addy Purnama 




ABSTRAK

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 inchi konfigurasi mooring 300 sebanyak 8 buah dan panjang stinger yang digunakan sepanjang 30 m dengan sudut datang 1360. Hasil penelitian ini didapatkan bahwa titik kritis terjadinya tegangan tebesar adalah 31.25 m dari ujung stern barge pada daerah overbend sebesar 136384 kNm2. Dan gerakan tunggal yang memiliki kontribusi terbesar terhadap tegangan pipa adalah gerakan pitch sebesar 98.56 dengan distribusi statistik lognormal untuk variasi tegangan.


ABSTRACT

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 300 for 8 lines and the length of stinger is about 30 m with depature angel 1360 has been used in this research. The result of this research are the critical point is at 31.25 m from the end of stern barge at the overbend region with a value about 136384 kNm2. And the single motion which gives the significant contribution is pitch about 98.56 with statistic distribution lognormal for its various stresses.



KeywordsTegangan Bending ; Time Domain ; Lay Barge Pitch ; S-Lay
 
Subject:  Pipa
Contributor
  1. Ir. J.J. Soedjono, M.Sc
    Yoyok Setyo H., ST, MT
Date Create: 25/11/2008
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100007030078
Collection ID: 3100007030078
Call Number: RSKe 665.544 Ibm a


Source
Undergraduate Theses of Ocean Engineering Department, RSKe 665.544 Ibm a, 2007

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