Analisis Buckling Selama Proses Abandonment And Recovery Pada Pipeline 20

Ardiansyah, Moch. (2016) Analisis Buckling Selama Proses Abandonment And Recovery Pada Pipeline 20. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam pelaksanaannya, proses instalasi sebuah subsea pipeline tidak sepenuhnya akan berjalan sesuai yang direncanakan. Ada beberapa hal yang bisa membuat proses instalasi tersebut harus dihentikan sementara, misalnya cuaca buruk, peralatan instalasi mengalami kerusakan, dan terjadi buckling pada pipeline saat proses instalasi. Jika salah satu peristiwa di atas terjadi, maka langkah mitigasi yang bisa dilakukan adalah abandonment and recovery. Secara garis besar, abandonment and recovery ini adalah langkah mitigasi yang dilakukan dengan menurunkan pipeline ke dasar laut hingga proses instalasi bisa berjalan kembali. Setelah segala sesuatunya siap dan proses instalasi akan dilanjutkan, maka pipeline dinaikkan kembali ke atas pipe lay barge. Proses abandonment and recovery ini dilakukan dengan bantuan A&R winch. Pada penelitian ini dilakukan analisis abandonment and recovery dengan variasi jarak ujung stinger terhadap permukaan laut. Ada 3 variasi yang dilakukan, yakni 3m, 4m, dan 5m. Dari hasil analisis yang dilakukan, diketahui bahwa pada jarak ujung stinger terhadap permukaan laut yang bernilai 3m dan 5m, pipeline mengalami kegagalan karena tegangan ekuivalen yang terjadi melebih batas aman (87% SMYS) yakni 398.49 Mpa (110.69% SMYS) dan 394.15 Mpa (109.49% SMYS). Selain itu, nilai unity check untuk local buckling juga melebihi 1 yakni 1.414 dan 1.382. Sedangkan untuk jarak ujung stinger terhadap permukaan laut yang bernilai 4m, pipeline tidak mengalami kegagalan karena tegangan ekuivalen yang terjadi sebesar 306.29 Mpa (85.08% SMYS) dan nilai unity check bernilai 0.821 pada overbend dan 0.789 pada sagbend. ======================================================================================================== In practice, the installation of a subsea pipeline was not fully be progressing as planned. There are several things that can make the installation has to be stopped temporarily, for example, bad weather, equipment installation was damaged, and the buckling occurs in the pipeline during the installation process. If any of the above events occurs, then the mitigation measures that can be done is the abandonment and recovery. Abandonment and recovery are mitigation measures undertaken by lowering the pipeline into the seabed until the installation is able to walk again. Once everything was ready and the installation process will continue, then the pipeline is raised back up the pipe lay barge. Abandonment and recovery process is done with the help of A & R winch. In this research, analysis of abandonment and recovery with variation of stinger stern depth. There are 3 variations, namely 3m, 4m and 5m. From the analysis, it is known that the stinger stern depth that is worth 3m and 5m, pipeline failure occurred because the equivalent stress exceeds safe limits (87% SMYS) ie 398.49 Mpa (110.69% SMYS) and 394.15 Mpa (109.49% SMYS). In addition, the value of unity check for local buckling also exceeds 1, ie, 1.235 and 1.207. As for the stinger stern depth that is worth 4m, not pipeline failure occurred because the equivalent stress of 306.29 Mpa (85.08% SMYS) and the value of unity in overbend check worth 0.717 and 0.689 on sagbend.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 621.867 2 Ard a-1 3100017068869
Uncontrolled Keywords: abandonment and recovery, tegangan ekuivalen, local buckling, unity check, abandonment and recovery, equivalent stress, local buckling, unity check
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA656.2 Buckling
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: - Davi Wah
Date Deposited: 10 Mar 2020 08:32
Last Modified: 10 Mar 2020 08:32
URI: http://repository.its.ac.id/id/eprint/75418

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