Risk Based Inspection (RBI) of Gas Cooling Heat Exchanger

Megawan, Alfa Muhammad (2017) Risk Based Inspection (RBI) of Gas Cooling Heat Exchanger. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

On October 2013, Pertamina Hulu Energi Offshore North West Java (PHE – ONWJ) platform personnel found 93 leaking tubes locations in the finfan coolers/ gas-cooling heat exchanger. After analysis had been performed, the crack in the tube strongly indicate that stress corrosion cracking was occurred by chloride. Chloride stress corrosion cracking (CLSCC) is the cracking occurred by the combined influence of tensile stress and a corrosive environment. CLSCC is the one of the most common reasons why austenitic stainless steel pipework or tube and vessels deteriorate in the chemical processing, petrochemical industries and maritime industries. In this thesis purpose to determine the appropriate inspection planning for two main items (tubes and header box) in the gas-cooling heat exchanger using risk based inspection (RBI) method. The result, inspection of the tubes must be performed on July 6, 2024 and for the header box inspection must be performed on July 6, 2025. In the end, RBI method can be applicated to gas-cooling heat exchanger. Because, risk on the tubes can be reduced from 4.537 m2/year to 0.453 m2/year. And inspection planning for header box can be reduced from 4.528 m2/year to 0.563 m2/year. ====================================================================================== Pada bulan Oktober 2013, personel anjungan lepas pantai dari Pertamina Hulu Energi Offshore North West Java (PHE-ONWJ) menemukan 93 pipa yang terindikasi terdapat kebocoran yang terdapat pada finfan cooler/ gas cooler heat exchanger nya. seteah analisa mendalam dilakukan keretakan pada pipa tersebut dapat disimpulkan tejadi Chloride Stress Corrosion Cracking (CLSCC). CLSCC adalah satu dari banyak sebab mengapa pipa austenitic stainless steel dan pressure vessel menjadi turun kualitasnya, khususnya industry yang berfokus pada proses kimia, industry perminyakan dan industri maritim. Tugas akhir ini bertujuan untuk menentukan perencanaan inspeksi terbaik pada dua bagian utama pada gas cooling heat exchanger (Header box dan tube) menggunakan metode risk based inspection (RBI). Hasilnya adalah, inspeksi pada tube atau pipa dapat dilakukan pada 6 Juli 2024 dan pada header box inspeksi dapat dilakukan pada 6 Juli 2025. Sebagai penutup, RBI dapat di lakukan pada gas cooling heat exchanger dikarenakan risiko pada tube/ pipa dapat diturunkan dari 4.537 m2/tahun menjadi 0.453 m2/tahun. Dan untuk risiko pada header box dapat diturunkan dari 4.528 m2/tahun menjadi 0.563 m2/tahun.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Risk Based Inspection, Gas-Cooling Heat Exchanger
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions: Faculty of Marine Technology > Marine Engineering > (S1) Undergraduate Theses
Depositing User: Alfa Muhammad Megawan
Date Deposited: 29 Sep 2017 07:01
Last Modified: 06 Mar 2019 07:49
URI: http://repository.its.ac.id/id/eprint/45566

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