ANALISA KEGAGALAN ROAD CROSSING GAS FLOWLINE API 5L GRADE B 6” SCHEDULE 40 DI PERUSAHAAN PRODUKSI GAS ALAM

Fajrin, Alvinura (2017) ANALISA KEGAGALAN ROAD CROSSING GAS FLOWLINE API 5L GRADE B 6” SCHEDULE 40 DI PERUSAHAAN PRODUKSI GAS ALAM. Diploma thesis, POLITEKNIK PERKAPALAN NEGERI SURABAYA.

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Abstract

ABSTRAK Kerusakan gas flowline saat kondisi servis merupakan hal yang sangat serius karena potensi kerugian yang sangat besar mulai dari kerugian materil, korban jiwa dan pencemaran lingkungan (American Society for Metals, 1998). Pada tanggal 11 Maret 2016, telah terjadi kebocoran flowline milik sebuah perusahaan produksi gas alam yang berada di Kabupaten Sidoarjo, Jawa Timur. Flowline terbuat dari pipa baja karbon API 5L Grade B Schedule 40. Oleh karena itu, penelitian ini bertujuan untuk mengetahui penyebab kegagalan flowline dan mengetahui solusi untuk mencegah kegagalan serupa agar tidak terjadi di waktu yang yang akan datang. Analisa kegagalan melalui metode Fault-Tree Analysis (FTA) digunakan untuk mencapai tujuan tersebut. Penelitian dilakukan dengan cara melakukan pengamatan visual, pengujian wall thicknes, pengujian Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDX) pada material pipa dan oksidanya, pengujian Optical Emission Spectroscopy (OES), pengujian liquid content dalam flowline, pengujian metallography dan pengujian korosi dengan potensio linier. Selain melakukan pengujian, dilakukan pula analisa data dari perusahaan, diantaranya komposisi gas dan kondisi servis. Berdasarkan analisa data yang dilakukan, kebocoran flowline disebabkan 57,23% oleh liquid content (terdiri dari H2O, ion Cl -dan ion SO4 2+ ), 19,32% Gas O2 terlarut, 0,43% gas CO2 terlarut, 18,74% oleh surface defect, 1,64% oleh flowrate, 1,64% oleh solid particle dan 1,01 % oleh tekanan internal yang diantara semuanya mengakibatkan korosi pitting, erosi dan korosi uniform. Melalui analisa markov, solusi untuk mencegah kegagalan flowline dapat dilakukan dengan cara meningkatkan availability dan reliability flowline dengan cara menurunkan laju korosi, meningkatkan intensitas inspeksi, meningkatkan ketebalan material dan menurunkan tekanan internal. Selain itu, penambahan 50 ppm produk inhibitor TIC – 8002 GCI mampu menurunkan laju korosi sampai 38,57% dan meningkatkan reliability flowline dari 37,93% menjadi 37,985% . Kata Kunci: flowline, korosi pitting, erosi, fault tree analysis, markov analysis, reliability ABSTRACT Gas flowline failure during service condition is very serious problem because of the huge potential loss, i.e. loss of cost, loss of life and environmental pollution (American Society for Metals, 1998). On March 11, 2016, there had been a flowline leakage of natural gas production company located in Sidoarjo, East Java. Flowline is made from carbon steel pipe API 5L Grade B Schedule 40. Therefore, the objectives of this research are investigating the causes of flowline failure and determining the solutions for preventing the similar failure so that it does not happen in the future. Failure analysis with the Fault-Tree Analysis (FTA) method is used to achieve that objectives. The research was conducted by visual observation, wall thicknes testing, Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDX) testing on pipe and oxide materials, Optical Emission Spectroscopy (OES) testing, flowline liquid content testing, metallography testing and corrosion testing with potentiostat. In addition, data of the company analysis was also conducted, including the composition of gas and service conditions. Based on testing and data analysis, flowline leakage caused 57.23% by liquid content (consist of of H2O, Cl -and SO4 2+ ions), 19.32% by dissolved O2 gas, 0.43% by dissolved CO2 gas, 18.74% by Surface defect, 1.64% by flow rate, 1.64% by solid particle and 1.01% by internal pressure all resulting in pitting corrosion, erosion and uniform corrosion. By conducting markov analysis, the solutions for preventing flowline failure will achieved through increasing availability and reliability by decreasing corrosion rates, increasing inspection intensity, increasing material thickness, and decreasing internal pressure. Moreover, the addition of 50 ppm of TIC-8002 GCI inhibitor products could reduce corrosion rate up to 38.57% and increase the flowline reliability from 37,93% to 37,985%. Keywords: flowline, pitting corrosion, erosion, fault tree analysis, markov analysis, reliability

Item Type: Thesis (Diploma)
Subjects: T Technology > T Technology (General)
Divisions: Jurusan Teknik Bangunan Kapal > Teknik Pengelasan
Depositing User: Unnamed user with email repository@ppns.ac.id
Date Deposited: 05 Oct 2018 06:19
Last Modified: 05 Oct 2018 06:19
URI: http://repository.ppns.ac.id/id/eprint/1345

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