Nuraini, Ika Puspita (2016) Analisis Resiko Pipa Bawah Laut Akibat Tarikan Jangkar Dengan Metode Monte Carlo : Studi Kasus Jaringan Pipa Bawah Laut Tunu Field, Blok Mahakam, Kalimantan Timur. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Jaringan pipa bawah laut yang terletak pada daerah dengan aktivitas produksi
migas yang tinggi memiliki resiko untuk mengalami kerusakan eksternal. Seperti
resiko untuk kejatuhan jangkar ataupun karena anchor dragging. Tugas Akhir ini
menganalisa resiko kegagalan pipa bawah laut akibat tarikan jangkar . Lokasi
produksi migas yang diambil untuk Tugas Akhir adalah di Tunu field, Blok
Mahakam. Dalam menghitung konsekuensi kegagalan digunakan dengan
pemodelan pada ANSYS dan menggunakan metode simulasi Monte Carlo.
Berdasarkan hasil perhitungan dengan variasi kecepatan kapal 7 knot, 8 knot, dan
9 knot, besar gaya tarikan jangkar dengan pengaruh kecepatan kapal saat menarik
pipa adalah sebesar 1164.89 kN, 2121.863 kN dan 2323.7189 kN. Kemudian
dilakukan pemodelan pipa di ANSYS, dengan memasukkan besar gaya tarikan
jangkar masing-masing variasi, tekanan internal serta tekanan eksternal pipa. Pipa
yang dimodelkan juga divariasikan panjangnya menjadi 20.32 m, 30.48 m, dan
40.64 m. Dari semua variasi didapatkan hasil bahwa pipa dengan panjang 20.32 m
dan dengan pengaruh tarikan jangkar kapal yang mempunyai kecepatan 7 knot
berada pada daerah ALARP. Sedangkan untuk variasi yang lainnya berada pada
daerah unacceptable risk.
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Subsea pipelines that located in areas with a high activity of oil and gas production
have high risk for damage. The damage that may occurred is external damage.
Such risk due to anchor dropping or anchor dragging. This final project analyze
the risk of failure subsea pipeline due to the anchor dragging. The location of oil
and gas production are taken for final project is in the Tunu field, the Mahakam
block. In calculating the consequences of failure are used by the ANSYS modeling
and simulation using Monte Carlo methods. Based on the calculations by varying
the speed of the vessel 7 knots, 8 knots and 9 knots, large anchor dragging force to
influence the speed of the vessel when pulling the pipe is equal to 1164.89 kN,
2121.863 kN and 2323.718 kN. Then the forces entered as an input for ANSYS
modeling. The input for ANSYS modeling include pipe internal pressure, external
pressure and force from anchor dragging. For anchor dragging force is influenced
by varying the speed of 7, 8 and 9 knots. Pipes are also varied in length be
modeled 20.32 m, 30.48 m and 40.64 m. Of all the models and variations the pipe
model at 20.32 m that have anchor holding force with speed of the vessel 7 knots
is in the region of ALARP. As for the other variations in the region of
unacceptable risk.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 665.744 Nur a |
| Uncontrolled Keywords: | Subsea Pipeline, Anchor Holding Force, Resistance, Monte Carlo, Risk Analysis. |
| Subjects: | T Technology > TS Manufactures > TS280 Pipe Bending, Tube Bending |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 08 Sep 2017 07:18 |
| Last Modified: | 27 Dec 2018 03:23 |
| URI: | http://repository.its.ac.id/id/eprint/48816 |
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