Ramialis, Annisa Fitrah (2016) Analisa Kekuatan Anchor Chain Pada Single Point Mooring FSO ARCO ARDJUNA. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
FSO (Floating Storage and Offloading) merupakan fasilitas terapung yang
dioperasikan di suatu ladang minyak dan gas bumi lepas pantai yang berfungsi
untuk menerima, menyimpan, dan menyalurkan hidrokarbon, terutama untuk
menyalurkan ke shuttle tanker. Pada tempatnya beroperasi, FSO akan dikenai
beban lingkungan yang dapat menyebabkan ia berperilaku dinamis. Untuk
mengurangi gerakan dan menjaga supaya FSO tetap berada pada tempatnya
beroperasi, maka dibutuhkan suatu sistem tambat. Analisa terhadap sistem tambat
perlu dilakukan, untuk mengetahui kekuatan sistem tambat sehingga operasi lepas
pantai dapat berjalan aman. Dalam Tugas Akhir ini, dilakukan analisis kekuatan
anchor chain pada single point mooring tipe CALM (Catenary Anchored Leg
Mooring) buoy yang menambat FSO dan shuttle tanker. Dengan mengetahui
perilaku gerak antara Single Point Mooring, FSO Arco Ardjuna, dan Shuttle
Tanker akibat beban lingkungan perairan pada kondisi tertambat, akan didapatkan
nilai tension pada anchor legs dari beberapa konfigurasi pembebanan. Pada saat
tertambat RAO pada SPM cenderungan mengalami kondisi puncak pada kondisi
FSO full load ketika gerakan rotasional Rolling saat arah datang gelombang Beam
Sea (90º) dengan frekuensi sebesar 2,944 rad/sec. Hasil analisa dengan Finite
Element Methode (FEM) untuk hasil tension pada anchor legs terbesar yaitu
1662,35 kN pada anchor leg2 pada arah 900 dengan safety factor 4,24, hasil ini
memenuhi safety factor menurut American Bureau of Shipping (ABS) untuk
kondisi intact (ULS) yaitu lebih besar dari 1,67. Besar tegangan maksimum (Von
Mises stress) pada anchor chain sebesar 311,24 Mpa lebih kecil dibandingkan
dengan tegangan ijin (Yield Strength) dikali 0,9 sebesar 369 Mpa sehingga
memenuhi aturan dan standar yang ditetapkan oleh ABS.
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FSO (Floating Storage and Offloading) is a floating facility that operates on an oil
and gas offshore source. Its function is for receiving, keeping, and distributing the
hydrocarbon mainly to the shuttle tanker. In its place, FSO will be charged by the
environmental loads. It makes the FSO will be dynamic. It needs a tether system
to reduce and keep the FSO, so that it will stay in the its operation place. The
analysis of tether system is needed to check the strength of that system so the
offshore operation can be done safely. In this final project, the anchor chain
strength analysis has been done on the Single Point Mooring CALM (Catenary
Anchored Leg Mooring) model buoy that tethered FSO and shuttle tanker. Due to
know the movement attitude between Single Point Mooring, FSO Arco Ardjuna,
and Shuttle Tanker that caused by water environment charge on the tethered
condition, it will be got the tension scale on the anchor legs from some charging
configuration. RAO of SPM tend to have maximum condition when FSO was on
full load condition and the Rolling rotation movement came with 900 Beam Sea
phase with 2.944 rad/sec for the frequency. By using Finite Element Method
(FEM), result of the analysis that appeared was the tension on the anchor legs was
1662.35 kN on the 2nd anchor leg with 900 direction with 4.24 safety factor. This
result fulfils the safety factor based on American Bureau Shipping (ABS) for
intact condition (ULS) is bigger than 1.67. The maximum strength (Von Mises
stress) on the anchor chain was 311.24 Mpa. It smaller than the Yield Strength
that multiplies by 0.9 as much as 369 Mpa. So, it passes the rule and standard that
used by ABS.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.32 Ram a |
| Uncontrolled Keywords: | Anchor Chain, Buoy, Tension, Floating Storage and Offloading, Von Mises stress |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 27 Feb 2020 02:31 |
| Last Modified: | 27 Feb 2020 02:31 |
| URI: | http://repository.its.ac.id/id/eprint/75210 |
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