Analisis Stabilitas Struktur Pipeline End Termination (PLET) Pada Subsea Facility Akibat Proses Settlement

Fajarisman, Muhammad (2024) Analisis Stabilitas Struktur Pipeline End Termination (PLET) Pada Subsea Facility Akibat Proses Settlement. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipeline End Termination (PLET) adalah struktur bawah laut yang dipasang di ujung pipa yang digunakan untuk menghubungkan pipeline dengan struktur bawah laut lainnya. Pada umumnya struktur offshore memiliki fondasi yang mana adalah bagian elevasi terendah dari manifold yang berfungsi meneruskan beban konstruksi ke tanah yang berada di bawahnya. Salah satu permasalahan yang bisa saja terjadi pada offshore structure adalah settlement. Settlement dapat mengganggu stabilitas PLET dan dapat mengakibatkan tegangan yang meningkat pada pipeline system. Analisis bearing capacity dilakukan dengan standar code API RP 2GEO dan ISO 19901-4 dengan nilai safety factor terkecil 2.0 dan nilai safety factor terbesar 3.0. Analisis sliding stability dilakukan dengan standar code API RP 2GEO dan ISO 19901-4 dengan nilai safety factor terkecil 5.6 dan nilai safety factor terbesar 15.7. Struktur PLET dianggap stabil karena safety factor telah memenuhi standar. Penurunan yang terjadi pada area struktur PLET sebesar 136 mm. Analisis tegangan dilakukan pada titik kritis sambungan pipeline akibat settlement dilakukan dengan menggunakan software AutoPIPE. Berdasarkan standard code ASME B31.8 didapat hasil ratio unity pada titk joint A201 dan A213 dengan nilai UC 0.89. Sedangkan berdasarkan standard code DNVGL-ST-F101, didapat hasil ratio unity check pada titik joint A201 dan A213 dengan nilai UC 0.72.
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Pipeline End Termination (PLET) is a subsea structure installed at the end of a pipeline that is used to connect the pipeline with other subsea structures. In general, offshore structures have a foundation which is the lowest elevation part of the manifold which functions to forward the construction load to the soil below. One of the problems that can occur in offshore structures is settlement. Settlement can disrupt the stability of the PLET and can result in increased stress on the pipeline system. Bearing capacity analysis is carried out with API RP 2GEO code standards and ISO 19901-4 with the smallest safety factor value of 2.0 and the largest safety factor value of 3.0. Sliding stability analysis is carried out with API RP 2GEO and ISO 19901-4 code standards with the smallest safety factor value of 5.6 and the largest safety factor value of 15.7. The PLET structure is considered stable because the safety factor has met the standard. The decline that occurred in the PLET structure area amounted to 136 mm. Stress analysis is carried out at the critical point of the pipeline connection due to settlement using AutoPIPE software. Based on the ASME B31.8 standard code, the results of the unity ratio at joint points A201 and A213 are obtained with a UC value of 0.89. While based on the DNVGL-ST-F101 standard code, the results of the unity check ratio at the A201 and A213 joint points are obtained with a UC value of 0.72.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Analisis Stress Pipa, Penurunan Tanah, PLET, Stabilitas, Pipe Stress Analysis, Settlement, PLET, Stability
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Fajarisman
Date Deposited:	05 Aug 2024 05:56
Last Modified:	05 Aug 2024 05:56
URI:	http://repository.its.ac.id/id/eprint/109638

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