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"Close Cooling Water (CCW) digunakan di Fasilitas Produksi Terapung untuk keperluan pertukaran panas. Cairan yang digunakan adalah Fresh Water yang berasal dari kegiatan reverse osmosis air laut. Sebagian besar material yang digunakan untuk perpipaan adalah baja karbon. Tidak ada rancangan penanganan resiko korosi internal sejak CCW beroperasi pada bulan Mei 2017. Hasil pemantauan laju korosi menunjukkan terjadi kenaikan yang mendekati ambang batas maksimal 3.94 mils penetration per year (mpy) sehingga dilakukan penelitian untuk mengurangi laju korosi menggunakan bahan kimia. Pada bulan Agustus 2019, bahan kimia Corrosion Inhibitor (CI) jenis nitrit ditambahkan ke dalam system CCW dan pada pemantauan berikutnya terjadi penurunan laju korosi dibawah 1 mpy. Penggunaan CI jenis nitrit perlu memperhatikan beberapa hal agar hasilnya optimum seperti pemantauan komposisi kimia dalam air, kegiatan pengurasan dan penambahan Fresh Water.

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Close Cooling Water (CCW) is used in Floating Production Facilities for heat exchange purposes. The liquid used is Fresh Water which comes from reverse osmosis seawater activities. Most of the materials used for piping are carbon steel. There has been no plan to address internal corrosion risks since CCW began operating in May 2017. The results of monitoring the corrosion rate showed an increase approaching the threshold maximum 3.94 mils penetration per year (mpy) so research was carried out to reduce the corrosion rate using chemicals. In August 2019, the nitrite type Corrosion Inhibitor (CI) chemical was injected to the CCW system and in subsequent monitoring the corrosion rate decreased below 1 mpy. The use of nitrite type CI requires paying attention to several things so that the results are optimal, such as monitoring the chemical composition of the water, draining activities and adding fresh water."

"Korosi merupakan penyebab utama kegagalan dalam industri minyak dan gas bumi. Mengisolir logam dari bahan korosi merupakan adalah cara yang paling efektif untuk mencegah korosi pada industri ini. Penggunaan inhibitor korosi alami menjadi alternatif baru untuk mencapai tujuan tersebut. Bahan alam dipilih sebagai alternatif karena bersifat aman, mudah didapatkan, bersifat biodegradable, biaya murah, dan ramah lingkungan.Penelitian ini dilakukan untuk mempelajari perilaku inhibisi ekstrak kulit manggis pada pipa baja API-5L di lingkungan air terproduksi dan dibandingkan dengan inhibitor kimia dengan menggunakan metode kehilangan berat. Parameter elektrokimia dievaluasi dengan menggunakan metode EIS dan metode FTIR dilakukan untuk mengidentifikasi gugus aktif yang bekerja. Ekstrak kulit manggis dipilih sebagai inhibitor korosi karena mengandung senyawa antioksidan yang dapat menghambat laju korosi. Hasil penelitian menunjukkan ekstrak kulit manggis dan inhibitor kimia merupakan inhibitor korosi yang sangat efektif untuk pipa baja API-5L di lingkungan air terproduksi karena dapat menurunkan laju korosi secara signifikan. Efisiensi inhibisi ekstrak kulit manggis sebesar 58 - 92% dengan penambahan 2 - 10 ml ekstrak kulit manggis. Ekstrak kulit manggis bekerja dengan membentuk suatu lapisan tipis (terlihat maupun tidak terlihat secara kasat mata) atau senyawa kompleks, yang mengendap (adsorpsi) pada permukaan logam sebagai lapisan pelindung yang dapat menghambat reaksi logam tersebut dengan lingkungannya. Mekanisme ini juga didukung dengan meningkatnya nilai tahanan polarisasi dari permukaan baja setelah ditambahakan inhibitor.

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Corrosion is the major cause failure in oil and gas industry. Isolate the metal from corrosion of materials is the most effective way to prevent corrosion for this industry. The use of green corrosion inhibitor become a new alternative to achieve that goal. Green inhibitor chosen as an alternative because it is safe, easily available, biodegradable, low cost, and environmentally friendly.

This study was conducted to study the inhibition behavior of pericarp of mangosteen extract for API-5L pipe steel in produced water environment and compared with chemical inhibitor using the weight loss method Electrochemical parameters are evaluated using EIS method and FTIR method to identify functional group that works. Pericarp of mangosteen extract is selected as corrosion inhibitor because they contain antioxidant compounds that can inhibit the corrosion rate.

Result showed pericarp of mangosteen extract and chemical inhibitor is highly effective corrosion inhibitor for API-5L pipe steel in produced water environment because it can inhibit the corrosion rate significantly. Inhibition efficiency for pericarp of mangosteen is 58 - 92% with addition of pericarp of mangosteen extract of 2 -10 ml. Pericarp of mangosteen works by forming a thin layer (visible or not visible by naked eye) or complex compounds, which settles (adsorption) to metal surfaces as a protective layer that can inhibit the reaction of the metal with its environment. This mechanism is also supported by the increased value of the polarization resistance of the steel surface after addition of inhibitor."

"Permasalahan korosi dalam bidang minyak dan gas, menjadi salah satu perhatian serius. Proses penanganan korosi ini dilakukan dengan dua klasifikasi metode yaitu secara fisika dan kimia. Pada penelitian ini dilakukan penanganan korosi secara kimia menggunakan 2-mercaptobenzothiazole (MBT) sebagai inhibitor korosi pada tembaga. Pengamatan dilakukan menggunakan metode berat hilang dan polarisasi ekstrapolasi Tafel dalam larutan yang mengandung ion klorida (HCl dan brine). Karakteristik film yang terbentuk diamati menggunakan spektrofotometer ATR-IR dan spektrofotometer UV Vis. Studi morfologi hasil menggunakan SEM. Hasil penelitian menunjukkan bahwa terbentuknya film Cu(II)-2-mercaptobenzothiazole pada permukaan tembaga melalui mekanisme adsorpsi isotermal Langmuir. Peningkatan konsentrasi MBT akan meningkatkan % inhibisi pada tembaga dari proses korosi, sedangkan peningkatan temperatur akan menurunkan % inhibisi korosi pada tembaga dikonsentrasi yang sama. Aplikasi penggunaan MBT dengan konsentrasi minimal 25 ppm pada temperatur 70 oC dengan waktu kontak 72 jam memberikan % inhibisi diatas 90,00 % pada brine sintetis.

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Corrosion problems in oil and gas fields are very serious concern. Corrosion treatment process is used by two methods, physical and chemical. In this research, the corrosion treatment by chemical method with 2-mercaptobenzothiazole (MBT) as a corrosion inhibitor in copper. This research used weight loss method and polarization with extrapolation Tafel in solution which chloride ion contains (HCl and brine). Characteristic of film layer using ATR-IR spectrophotometer and UV Vis spectrophotometer. Surface morphological study was observed on SEM.

The results showed that formed Cu(II)-2-mercaptobenzothiazole on copper surface through the Langmuir isothermal adsorption mechanism. Increasing of concentration MBT will improve the % inhibition of copper from the corrosion process, whereas an increase in temperature will decrease the % corrosion inhibition of copper in the same concentration. The application of MBT in the minimal concentration 25 ppm at 70 °C in 72 hours contact times gave % inhibition value more than 90.00 % in synthetic brine."

"Tangki Fresh water merupakan bagian dari Fresh water system yang berperan penting untuk menyediakan kebutuhan air tawar di unit Produksi gas Terapung (FPU). Melalui metode reverse osmosis (RO) dalam unit Fresh water generation, terjadi proses perubahan air laut menjadi air tawar yang kemudian disimpan dalam tangki fresh water sebelum didistribusikan lebih lanjut ke berbagai sistem. Saat dilakukan pembersihan rutin tangki pada akhir 2022, ditemukan adanya korosi pitting yang menyebar di dasar tangki. Diketahui bahwa korosi tersebut telah mengurangi ketebalan plat hingga 47.5%. Dalam penelitian ini, pendekatan teknis dan praktis dilakukan dalam pemilihan metode perbaikan untuk menghindari korosi berkelanjutan dan antisipasi berulangnya penyebab utama korosi. Perbaikan yang dilakukan dengan mempertimbangkan regulasi Klas, jenis Coating, aturan pemeliharaan dan Keselamatan serta optimasi waktu dan biaya pengerjaan. Dari hasil penelitian diketahui bahwa kondisi korosi dapat diperbaiki dengan pemilihan produk filler compund yang sesuai dengan spesifikasi coating. Pemilihan dry abrasive blasting media non-metallic recycable sponge sebagai solusi terpilih dengan dampak lingkungan rendah, efek getaran peralatan rendah dan sedikit debu blasting untuk menghindari dampak kesehatan pekerja. Metode coating dilakukan dengan metode airless spray yang efektif. Pada akhir kegiatan dilakukan pengecekan kualitas melalui DFT dan Holiday test. Korosi pada tanki ini merupakan pertama kali di FPU sehingga dengan adanya proyek ini menjadikan pedoman dalam menentukan metode perbaikan tanki yang tepat untuk menghambat laju korosi dan menjaga integritas tanki.

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The fresh water tank is part of the fresh water system which plays an important role in providing fresh water needs in the floating gas production unit (FPU). Through the reverse osmosis (RO) method in the Fresh water generation unit, the process of changing sea water into fresh water occurs which is then stored in a fresh water tank before being distributed further to various systems. During routine cleaning of the tank at the end of 2022, pitting corrosion was found spreading at the bottom of the tank. It is known that the corrosion has reduced the plate thickness by up to 47.5%. In this research, a technical and practical approach was taken in selecting repair methods to avoid continuous corrosion and anticipate the recurrence of the main causes of corrosion. Repairs are carried out taking into account class rules, type of coating, maintenance and safety regulations as well as optimizing work time and costs. From the research results, it is known that corrosion conditions can be improved by selecting filler compound products that comply with coating specifications. Selecting dry abrasive blasting non-metallic recyclable sponge media as the chosen solution with low environmental impact, low equipment vibration effects and little blasting dust to avoid impact on worker health. The coating method is carried out using an effective airless spray method. At the end of the activity, quality checks are carried out through DFT and Holiday tests. Corrosion on this tank is the first time at FPU, so this project provides guidance in determining the appropriate tank repair method to inhibit the rate of corrosion and maintain tank integrity."

"ABSTRAKPenelitian ini difokuskan pada analisa korosi pipa trunk line yangmenyebabkan pipa diganti dalam waktu 8 tahun dari 15 tahun rencana desain.Material baja API 5L Grade B dalam kondisi belum terpakai dan yang terkorosidianalisis secara fisik dan mekanik menggunakan uji metalografi, uji tarik, ujikomposisi kimia, Scanning electron microscopy-Energy Dispersive Spectroscopy(SEM-EDS), Difraksi Sinar-X (XRD), kemudian uji korosi dengan metodepolarisasi. Pada sampel belum terpakai diperoleh nilai laju korosi 0,0531 mmpydan sampel terkorosi diperoleh nilai 0,1377 mmpy. Juga terbentuk fasa Fe3O4(magnetite), FeS (besi sulfida) dan SiO2 (silika). Hasil data di lapangan berupakondisi sekitar jalur pipa trunk line dan laju korosi yang dihasilkan akibatpenurunan ketebalan menghasilkan data sisa umur pakai aktual yang dibandingkandengan sisa umur pakai sampel hasil pengujian.

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ABSTRACTThis research focused on the trunk line corrosion analysis that has causedpipe replacement within 8 years instead of 15 years design lifetime. Samples ofAPI 5L Grade B material were analyzed with physical and mechanical tests usingmetallographic, tensile testing, chemical composition test, scanning electronmicroscopy-energy dispersive spectroscopy (SEM-EDS), X-Ray difraction (XRD),then polarization corrosion test. On the new unused sample obtained corrosion Adeof 0.0531 mmpy and corroded sample obtained 0.1377 mmpy. Also formed phaseFe3O4 ( magnetite ) , FeS ( iron sulfide ) and SiO2 ( silica ). The results of fielddata in the form of conditions around the trunk line area and the pipeline corrosionrate generated due to decreased thickness obtained the actual remaining life datacompared with the remaining lifetime of the sample test"

"[ABSTRAKSistem air pendingin merupakan sistem resirkulasi terbuka yang berfungsi untuk mendinginkan air yang berasal dari proses suatu industri. Salah satu permasalahan yang timbul pada sistem air pendingin resirkulasi terbuka adalah pertumbuhan mikroba. Untuk mengendalikan pertumbuhan mikrobia pada sistem pendinginditambahkan isothiazoline biocide dan dilakukan pemantauan terhadappertumbuhan mikroba pada air dalam sistem pendingin. Dari hasil pengamatan dapat dilihat pertumbuhan mikroorganisme akan semakin cepat sehubungan dengan lama waktu terutama apabila menara pendingin berada dalam kondisi diam (stagnan). Pertumbuhan mikroba ini dapat menyebabkan terjadi korosi pada sistem menara pendingin. Untuk mencegah proses korosi akibat mikroba ini, maka dilakukan inhibisi dengan menggunakan inhibitor phosphoric acid. Hasilpengamatan menunjukkan bahwa konsentrasi optimum 100 ppm inhibitor phosphoric acid dengan penambahan 100 ppm isothiazoline biocide untuk menurunkan laju pertumbuhan mikroba. Kemampuan inhibisi korosi diinvestigasi melalui simulasi pengujian korosi yang terjadi pada sampel kupon yang direndam dalam kurun waktu tertentu dengan menggunakan air sistem menara pendingin. Pengujian ini dievaluasi dengan metode pengujian Tafel Polarisasi dan Electrochemical Impedance Spectroscopy (EIS).

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ABSTRACTCooling water system is an open recirculation system which serves to cool water from anindustrial process. One of the problems that arise in open recirculating cooling water systems is the growth of microbial. To control the growth of microbial in the cooling system added isothiazoline biocide chemicals and monitoring the growth of microbial in the water in the cooling system. From the observation can be seen to be the faster growth of microbial in relation to the length of time, especially if the cooling tower is at rest (stagnant). The growth of these microbial can cause corrosion in cooling water systems. To prevent the formation of corrosion due to these microbial, the inhibition is done by using the phosphoric acid inhibitor. The results showed that the optimum concentration of 100 ppm phosphoric acid inhibitor with the addition of 100 ppm isothiazoline biocide to reduce the rate of growth of microbial. Corrosion inhibition ability investigated through the simulation testing of corrosion that occurs on the coupon samples were immersed in a certain period of time by using water cooling tower systems. This test was evaluated by Tafel polarization test methods and Electrochemical Impedance Spectroscopy (EIS).;Cooling water system is an open recirculation system which serves to cool water from anindustrial process. One of the problems that arise in open recirculating cooling watersystems is the growth of microbial. To control the growth of microbial in the coolingsystem added isothiazoline biocide chemicals and monitoring the growth of microbial inthe water in the cooling system. From the observation can be seen to be the faster growthof microbial in relation to the length of time, especially if the cooling tower is at rest(stagnant). The growth of these microbial can cause corrosion in cooling water systems.To prevent the formation of corrosion due to these microbial, the inhibition is done byusing the phosphoric acid inhibitor. The results showed that the optimum concentration of100 ppm phosphoric acid inhibitor with the addition of 100 ppm isothiazoline biocide toreduce the rate of growth of microbial. Corrosion inhibition ability investigated throughthe simulation testing of corrosion that occurs on the coupon samples were immersed in acertain period of time by using water cooling tower systems. This test was evaluated byTafel polarization test methods and Electrochemical Impedance Spectroscopy (EIS)., Cooling water system is an open recirculation system which serves to cool water from anindustrial process. One of the problems that arise in open recirculating cooling watersystems is the growth of microbial. To control the growth of microbial in the coolingsystem added isothiazoline biocide chemicals and monitoring the growth of microbial inthe water in the cooling system. From the observation can be seen to be the faster growthof microbial in relation to the length of time, especially if the cooling tower is at rest(stagnant). The growth of these microbial can cause corrosion in cooling water systems.To prevent the formation of corrosion due to these microbial, the inhibition is done byusing the phosphoric acid inhibitor. The results showed that the optimum concentration of100 ppm phosphoric acid inhibitor with the addition of 100 ppm isothiazoline biocide toreduce the rate of growth of microbial. Corrosion inhibition ability investigated throughthe simulation testing of corrosion that occurs on the coupon samples were immersed in acertain period of time by using water cooling tower systems. This test was evaluated byTafel polarization test methods and Electrochemical Impedance Spectroscopy (EIS).]"