Analisis Tegangan pada Tie-In Export Gas Pipeline 10" dan Stabilitas 28" EJGP Pipeline from MAC WHP

Shafa, Mevlevi Haydar As (2023) Analisis Tegangan pada Tie-In Export Gas Pipeline 10" dan Stabilitas 28" EJGP Pipeline from MAC WHP. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem distribusi minyak dan gas merupakan salah satu aspek yang perlu diperhatikan terutama offshore pipeline. Penyambungan export pipeline pada existing pipeline merupakan salah satu permasalahan yang perlu dianalisis agar tidak terjadi kegagalan struktur tie-in. Tujuan dari penelitian ini adalah untuk mengetahui tegangan dan stabilitas pada pipa yang dilakukan tie-in, serta integritas struktur pendukung subsea valve skid sehingga cukup memadai dan tidak mengalami kegagalan ketika dikenakan beban. Penelitian ini dimulai dengan menghitung properti dan gaya hidrodinamis yang bekerja pada pipa existing sehingga didapatkan nilai stabilitas secara vertikal dan lateral sesuai kriteria. Analisis stabilitas menunjukkan pipa existing stabil secara vertikal dan lateral dengan meningkatkan concrete thickness 44.5 mm ke 50 mm. Kemudian, dilakukan perhitungan manual dan pemodelan pipa existing dan tie-in spool system pada software AutoPIPE untuk mengetahui nilai tegangan kritis pada struktur tie-in spool serta pengaruh displacement pipa existing terhadap tegangan struktur tie-in spool. Tegangan pada tie-in spool yang paling kritis terjadi pada elbow yang menahan ekspansi dari arah platform. Selain itu, tegangan pada elbow dekat sambungan meningkat seiring dengan bertambahnya displacement pipa existing. Analisis juga dilakukan pada struktur pendukung subsea valve skid pada software SACS untuk memperoleh unity check maksimum. Hasil analisis in-place menunjukkan bahwa struktur subsea valve skid masih dikategorikan aman dengan nilai maksimum member unity check sebesar 0.4 pada member support
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The oil and gas distribution system is one aspect that needs to be considered, especially offshore pipelines. Connecting export pipelines to existing pipelines is one of the problems that need to be analyzed so that there is no tie-in structure failure. The purpose of this study is to determine the stress and stability of the tie-in pipe, as well as the integrity of the subsea valve skid support structure so that it is adequate enough and does not fail when subjected to load. This research begins by calculating the properties and hydrodynamic forces acting on existing pipes so that vertical and lateral stability values are obtained according to the criteria. Stability analysis shows the existing pipe is stable vertically and laterally by increasing the concrete thickness from 44.5 mm to 50 mm. Then, manual calculations and modeling of existing pipes and tie-in spool systems are carried out in AutoPIPE software to determine the critical stress value of the tie-in spool structure and the effect of existing pipe displacement on the stress of the tie-in spool structure. The most critical stress on the tie-in spool occurs in the elbow which resists expansion from the direction of the platform. In addition, the stress on the elbow near the connection increases with the increase in the displacement of the existing pipe. Analysis was also carried out on the subsea valve skid structure in SACS software to obtain maximum unity check. The results of the in-place analysis show that the subsea valve skid structure is still categorized as safe structure with a maximum value of member unity check of 0.4 on member support

Item Type:	Thesis (Other)
Uncontrolled Keywords:	tie-in spool, displacement, stress, stability, stabilitas, tegangan, unity check
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines. T Technology > TN Mining engineering. Metallurgy > TN880.5 Natural gas pipelines
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Mevlevi Haydar As Shafa
Date Deposited:	20 Jul 2023 07:26
Last Modified:	20 Jul 2023 07:26
URI:	http://repository.its.ac.id/id/eprint/98719

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