Analisis Risiko pada Pipa Gas terhadap Rencana Pembangunan Flyover Teluk Lamong

A`yun, Sela Ferdiananta (2018) Analisis Risiko pada Pipa Gas terhadap Rencana Pembangunan Flyover Teluk Lamong. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemancangan tiang pondasi flyover Teluk Lamong yang berada di dekat pipa gas milik PT. X, tentunya menimbulkan ancaman yang harus dihindari. Tujuan dilakukannya penelitian ini adalah untuk mengidentifikasi kemungkinan terjadinya soil liquefaction akibat getaran pemancangan yang dapat mempengaruhi pipa gas PT. X. Soil liquefaction dapat memicu penurunan tanah dan menyebabkan perubahan properties atau kerusakan pipa. Analisis risiko dilakukan dengan metode monte carlo untuk mencari peluang kegagalan dari sistem yang ditinjau. Penentuan konsekuensi dilakukan berdasarkan analisis tegangan pada pipa, dengan membandingkan nilai combined stress dan SMYS (Specified Minimum Yield Strength). Setelah mendapatkan hasil perbandingan, maka dilakukan perangkingan dengan matriks risiko DNVGL-RP-F107. Dari perhitungan dan analisis yang telah dilakukan berdasarkan data yang ada, diketahui bahwa peristiwa soil liquefaction tidak akan terjadi atau kemungkinan terjadinya sangat kecil, karena nilai safety factor dari KP 62+300 sampai KP 62+630 lebih besar dari 1 (satu) untuk percepatan getaran tanah minimum (a min = 0,059 g), rata-rata (a avg = 0,116 g), dan maksimum (a max = 0,323), sehingga potensi penurunan tanah juga tidak ada. Nilai combined stress yang dibandingkan dengan SMYS menunjukan konsekuensi untuk semua kilometer post, berada pada batas minimum kriteria < 0,9 SMYS atau dengan kata lain konsekuensi pipa berada pada rangking terendah. Hasil tugas akhir ini menunjukan posisi frekuensi dan konsekuensi berada di zona ALARP (As Low As Reasonably Practicable) pada matriks risiko. =============================================== The erection of the pile foundation of Teluk Lamong flyover which located near the gas pipe belonging to PT. X, certainly poses a threat to be avoided. The purpose of this research is to identify the possibility of soil liquefaction due to the vibration of piling erection that can affect gas pipeline PT. X. Soil liquefaction can trigger a settlement soil and cause changes in the properties or damage to the pipe. Risk analysis is done by monte carlo method to find the chance of failure of the system. Determination of consequences is done based on the stress analysis on the pipeline, by comparing the value of combined stress with SMYS (Specified Minimum Yield Strength). After obtaining the result of comparison, then rank with DNV GL RP-F107 risk matrix. From the calculation and analysis that has been done based on the available data, it is known that the soil liquefaction event will not happen or the possibility of occurrence is very small, because the safety factor value from KP 62+ 300 to KP 62+ 630 is greater than 1 for minimum (a min= 0,059 g) ground vibration acceleration, average (a avg= 0,116 g), and maximum (a max= 0,323). So the potential for ground loss (settlement) also does not exist. The combined stress value compared to SMYS shows the consequences for all kilometers post, at the minimum criterion of <0.9 SMYS or in other words the consequence of the pipe is at the lowest rank (no damage). The result of this final project shows the position of frequency and the consequence is in ALARP (As Low As Reasonably Practicable) zone on the risk matrix.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Analisis Risiko; Pipa Gas; Soil Liquefaction; CRR (Cyclic Resistance Ratio) dan CSR (Cyclic Stress Ratio)
Subjects: T Technology > T Technology (General) > T174.5 Technology--Risk assessment.
T Technology > TC Hydraulic engineering. Ocean engineering
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Sela Ferdiananta A'yun
Date Deposited: 21 Jun 2021 01:29
Last Modified: 21 Jun 2021 01:29
URI: https://repository.its.ac.id/id/eprint/53976

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