Analisa Tegangan Pipa Bawah Laut Selama Proses Above Water Tie-In Menggunakan Davit Lifting Dan Buoyancy Tank

Ibrahim, Romi (2016) Analisa Tegangan Pipa Bawah Laut Selama Proses Above Water Tie-In Menggunakan Davit Lifting Dan Buoyancy Tank. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Pipeline Engineering merupakan suatu rekayasa teknik tentang sebuah struktur pipa yang sering digunakan sebagai sistem pendistribusian minyak dan gas bumi. Dalam pendistribusiannya, pipa diinstal terlebih dahulu agar dapat beroperasi. Ketika proses instalasi pipa dilakukan, scope pengerjaannya biasanya dibagi menjadi tahapan seperti offshore dan onshore, maka perlu dilakukan proses above water tie-in (AWTI) pada tahap akhir dari instalasi pipa tersebut. Dalam instalasi pipa perlu dilakukan analisa tegangan pipa terutama pada daerah sagbend dan overbend. Tegangan yang terjadi pada pipa tersebut dapat mengakibatkan pipa mengalami bending dan yang paling parah yaitu terjadinya buckling. Sebelum melakukan analisa proses above water tie-in, dilakukan analisa respon gerak struktur barge terlebih dahulu. Nilai maksimum respon gerak pada barge Onasis 10 pada kondisi free floating untuk gerakan surge, sway, heave, roll, pitch dan yaw secara berurutan adalah 0,908 (m/m), 0,928 (m/m), 0,99 (m/m), 4,192 (deg/m), 1,925 (deg/m), 3,127 (deg/m). Analisa yang dilakukan adalah ketika barge dalam keadaan full load. Setelah itu barulah dilakukan proses lifting dan lowering. Pada saat lifting, tegangan paling besar yang terjadi yaitu sebesar 347,63 MPa pada step ke-9 di bagian stern dan 337,18 MPa pada step ke-10 di bagian bow. Sedangkan untuk proses lowering, tegangan paling besar yang terjadi yaitu sebesar 352,1 MPa pada bagian stern pada step ke 3 dan 361,1 MPa pada bagian bow pada step ke-3 =============================================================================================Pipeline Engineering is a technique on pipeline structure which is used as distribution system on oil and gas in the world. In case of distribution, pipeline should be installed before operating process. When installation process occured, the scope divided by offshore and onshore section, then above water tie-in process is required at the end of the project. In case of pipeline installation, pipeline stress analysis is required especially on sagbend and overbend area. The stress on pipeline can make pipeline become bend, and the worst is buckling. Because of that risk, great analysis on pipeline installation should be required, include above water tie-in process. Before above water tie-in analysis, motion response analysis should be required as a place of above water tie-in process. The maximum motion response of Onasis 10 Barge on free floating condition is 0,908 (m/m) in surge, 0,928 (m/m) in sway, 0,99 (m/m) in heave, 4,192 (deg/m) in roll, 1,925 (deg/m) in pitch, and 3,127 (deg/m) in yaw. The analysis is based on full load condition and specified environment. After that, lifting and lowering should be done as the main project. While lifting process, the maximum stress is 347,63 MPa in 9th step on stern side and 337,18 MPa in 10th step on bow side. While lowering process, the maximum stress is 352,1 MPa in 3rd step on stern side and 361,1 MPa in 3rd step on bow side

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 621.867 2 Ari a
Uncontrolled Keywords: Davit Lifting, buoyancy tank, above water tie-in.
Subjects: T Technology > TN Mining engineering. Metallurgy > TN879.5 Petroleum pipelines
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 28 Mar 2020 06:10
Last Modified: 28 Mar 2020 06:10
URI: http://repository.its.ac.id/id/eprint/75596

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