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All Journal Jurnal Sains dan Teknologi Majalah Ilmiah Material, Komponen dan Konstruksi Majalah Ilmiah Pengkajian Industri Jurnal Kajian Islam dan Sosial Keagamaan
Laili Novita Sari
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Religion Aerospace Engineering Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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ANALYSIS OF DENICKELIFICATION PHENOMENON ON HEAT EXCHANGER TUBE Suhadi, Amin; Febriyanti, Eka; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol 12, No 2 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1266.83 KB) | DOI: 10.29122/mipi.v12i2.2955

Abstract

DeNickelification is common phenomenon which occurs for alloy metal containing sufficient amounts of Nickel when it is exposed at high temperature in long time periode. One of component which is made of alloy metal containing Nickel is heat exchangers tube.  Heat exchanger is a part of processing unit that use for transfering heat from hot fluid to colder fluid through the combined mechanisms of conduction and convection.  When the heat exchanger leaks, all of the processing system could be affected.  In this research a leakage heat exchanger tube is investigated by failure analysis methods to find the root cause of failure.  Several tests and examinations such as fractography, metallography examinations, SEM and EDS, hardnes as well as chemical compositions test are carried out to this tube to obtain detailed information for further analysis.Result of this reseach shows that some Cu residue, Ni, aggressive/corrosive ion such as Cl- and S2- at the leak area of heat exchanger tube is found.  These evidences indicated that denickelification was occurred on inner surface of heat exchanger tube caused by potential difference between Ni2+ion and Cu2+ ion to form a galvanic cell.  Furthermore, since the tube is flown by fluid material which contains aggressive / corrosive ions such as Cl- ion and S2- then pitting corrosion on inner surface of tube is formed. This mechanism had been taken place continuously during operation of heat exchanger and pitting corrosion keep growing until the tube leaks.
ANALISA KEGAGALAN POLISHED ROD PADA POMPA ANGGUK Febriyanti, Eka; Suhadi, M.Eng., Dr. Ir. Amin; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol 13, No 2 (2019): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (954.211 KB) | DOI: 10.29122/mipi.v13i2.3172

Abstract

Tulisan ini membahas tentang kerusakan polished rod akibat material yang digunakannya bersifat getas dan memiliki mikrostruktur yang tidak homogen. Pemeriksaan pada polished rod dari pompa angguk  menggunakan metode pengamatan visual, fraktografi makro, metalografi, uji kekerasan, analisa komposisi kimia, pemeriksaan SEM, serta uji komposisi produk korosi dengan EDX. Hasil pemeriksaan visual dan uji penetran menunjukkan adanya retak melintang yang menyebar pada satu sisi permukaan polished rod menunjukkan bahwa polished rod mengalami pembebanan bending sebelum patah. Sedangkan hasil pemeriksaan fraktografi memperlihatkan adanya daerah patahan getas dengan pola radial mark yang menandakan bahwa jenis pembebanan merupakan beban statis dengan alur perambatan yang berlangsung cepat. Selain itu, hasil pengamatan metalografi memperlihatkan bahwa struktur mikro pada polished rod bersifat tidak homogen yang terdiri atas ferit-perlit, bainit, dan martensit yang bersifat getas.  Jadi, dapat disimpulkan bahwa penyebab kerusakan adalah ketidakhomogenan pada mikrostruktur dan sifat material yang bersifat getas yang berperan sebagai konsentrasi tegangan. Dengan tertahannya sistem kerja pompa angguk menyebabkan satu sisi polished rod mengalami pembebanan bending sampai material tidak mampu lagi menahan beban lalu patah.
FATIGUE AND CORROSION PHENOMENON ON FAILURE OF WATER WALL TUBE BOILER Febriyanti, Eka; Suhadi, Amin; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol 14, No 1 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (711.418 KB) | DOI: 10.29122/mipi.v14i1.3565

Abstract

Water wall tube is one of a boiler components which has a function to transform water to be vapour so that it is normally called steam generating tubes. Any failure on wall tube will affect to the whole boiler system.  The purpose of this research is to find out root cause of failure of wall tube in order to avoid similar case in the future.  Research is conducted by examining and testing the specimens on all aspects including visual, fractography, metallography, chemical analysis, hardness test and tensile test. Examination on the fracture surface by fractographic method found the evidence of fatigue fracture with the presence of beachmark. Another examination on uninstalled boiler tube shows indication of fabrication defect and trans-granular cracks which allowed corrosive agent infiltrated into the microstructure of the tube. However, the result of chemical analysis and tensile test indicated that the tubes investigated are in accordance with ASTM A 210 Grade C specifications. Therefore, the failure of the tube is not caused by wrong material selection, but through the combination of fatigue fracture and corrosion attack where initiated at fabrication defect that acted as stress raisers.
IMPLEMENTATION OF ROOT CAUSE ANALYSIS METHOD TO INVESTIGATE FAILURE OF FRONT WALL TUBE BOILER Febriyanti, Eka; Suhadi, Amin; Sari, Laili Novita
Majalah Ilmiah Pengkajian Industri Vol. 14 No. 3 (2020): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v14i3.4104

Abstract

Root cause analysis is a method that observes all of the possible causes that make the system or components fail. This research is implemented such a method to investigate the failed front wall tube on the boiler. The purpose of this research is to find out the main cause of failure on the front wall tube to avoid a similar problem in the future.  Considering all aspects that have the potential to be the main cause of failure, therefore, many tests and examinations are done, including visual tests, fractography, metallography, chemical analysis, hardness test, SEM, and EDS analysis.  Examination result on the fracture surface shows two bulges on a tube and some longitudinal cracks spread on bulges outside the surface area. At the same time, the thick scale is also found on the inside surface of these bulges. Moreover, microstructure and hardness changes are also found in this area.  From the analysis of all test result that obtained it is concluded that the main cause of failure is the presence of scales which reduce heat transfer so that local overheating occurred.  Consequently, its tensile strength in this area is decreased, and finally, the tube could not support operational pressure and deformed to make a bulge.      Keywords: Root cause; Failure; Front wall; Tube; Boiler
SERANGAN KOROSI SUMURAN (PITTING CORROSION) PADA PIPA ROLL BEARING DISTRIBUSI hadi sunandrio; Laili Novita Sari
Jurnal Material Komponen dan Konstruksi Vol 11, No 2 (2011)
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mkk.v11i2.556

Abstract

Dalam instalasi explorasi minyak, peralatan yang digunakan untuk menyalurkan minyak mentah dari sumur minyak ke tangki - tangki penampungan melalui pipa distribusi. Dimana untuk membagi ke masing-masing tanki penampungan pada pipa distribusi unit penyaluran minyak yang dibuat dapatberputar dengan menggunakan roll bearing.Pada penelitian ini telah diamati kerusakan yang terjadi pada disuatu instalasi explorasi minyak yang mengakibatkan kebocoran. Hasil penelitian menunjukkan bahwa penyebab utama kerusakan pada roll bearing karena adanyaserangan korosi sumuran . Pada bagian dalam bearing pada kondisi beroperasi selalu bersentuhan langsung dengan cairan / minyak secara terus menerus yang mengandung air danelemen-elemen yang bersifat korosif. Dalam keadaan demikian maka clearence pada bearing akan membesar dan pada akhirnya akan timbul kebocoran. Pemeriksaan dan pengujian yang dilakukan terhadap roll bearing, meliputi :pemeriksaan fraktografi dan metalografi, uji kekerasan, analisa komposisi kimia, serta pemeriksaan dengan SEM dan EDAX. Data dari hasil pemeriksaan dan pengujian tersebut kemudian di analisa untuk mengetahui penyebab terjadinya kebocoran pada roll bearing tersebut.
PENGARUH PERUBAHAN MIKROSTRUKTUR TERHADAP PERUBAHAN KEKERASAN RADIANT TUBE YANG TELAH BEROPERASI SEJAK 2003 Laili Novita Sari; Sutarjo .
Jurnal Material Komponen dan Konstruksi Vol. 16 No. 1 (2016)
Publisher : Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mkk.v16i1.3289

Abstract

B2TKS - Sub- Analysis of Damage and residual life has done Remaining Life Assessment to the radiant tube on oil and gas companies from 2003 - 2016. In determining the RLA, it was used graph of the Era Technology where the determination is based on the microstructural changes while there are no literature or research which shows the hardness changing of material ASTM A 213 T5 which occurs during the aging process. Therefore it need to make formulation about the changes of spheriodizationto the chages of hardness of radiant tube material ASTM A 213 T5. By knowing a reasonable decrease in hardness to spheriodization, it was expected to detect the abnormal condition or damage earlier. Based on the examination of metallographic and hardness testing ,is was known that the reduction of hardness occur in proportion to the increase ofsperiodization percentage. In spheriodzation changing of Classification A, B, C the decrease of hardness below 0.7 HB / HB0 while classification D until the next classification,reduction of hardness above 0,7HB / HB0.AbstrakB2TKS – Sub Bidang Analisa Kerusakan dan umur sisa telah melakukan Remaining Life Assesment pada radiant tube pada perusahaan minyak dan gas bumi dari tahun 2003 – 2016. Dalam penentuan RLAdigunakan grafik dari Era Teknologi dimana penentuannya berdasarkan perubahan struktur mikro sedangkan untuk perubahan kekerasan material belum ada literatur atau penelitianyang menunjukkan tentang perubahan kekerasan pada material ASTM A 213 T5yang terjadi selama proses penuaan. Karena itu dilakukan perumusanperubahan kekerasan terhadap speriodisasi pada tube radiant material ASTM A 213 T5. Dengan mengetahui penurunan kekerasan yang wajar terhadap speriodisasi diharapkan akan mempermudah pendeteksian awal kondisi abnornal atau kerusakan. Berdasarkan pengamatan metalografi dan uji kekerasan diketahui bahwa penurunan kekerasan terjadi secara proporsional dengan peningkatan prosentase spriodisasi. Klasifikasi A, B, C penurunan kekerasan dibawah 0,7 HB/HB0 sedangkan klasifikasi D sampai berikutnya penurunan kekerasan diatas 0,7HB/HB0.Keywords: hardness, radiant tube, in situ metallography, ASTM A 213 T5
ANALYSIS OF DENICKELIFICATION PHENOMENON ON HEAT EXCHANGER TUBE Amin Suhadi; Eka Febriyanti; Laili Novita Sari
Majalah Ilmiah Pengkajian Industri Vol. 12 No. 2 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BRIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v12i2.2955

Abstract

DeNickelification is common phenomenon which occurs for alloy metal containing sufficient amounts of Nickel when it is exposed at high temperature in long time periode. One of component which is made of alloy metal containing Nickel is heat exchangers tube.  Heat exchanger is a part of processing unit that use for transfering heat from hot fluid to colder fluid through the combined mechanisms of conduction and convection.  When the heat exchanger leaks, all of the processing system could be affected.  In this research a leakage heat exchanger tube is investigated by failure analysis methods to find the root cause of failure.  Several tests and examinations such as fractography, metallography examinations, SEM and EDS, hardnes as well as chemical compositions test are carried out to this tube to obtain detailed information for further analysis.Result of this reseach shows that some Cu residue, Ni, aggressive/corrosive ion such as Cl- and S2- at the leak area of heat exchanger tube is found.  These evidences indicated that denickelification was occurred on inner surface of heat exchanger tube caused by potential difference between Ni2+ion and Cu2+ ion to form a galvanic cell.  Furthermore, since the tube is flown by fluid material which contains aggressive / corrosive ions such as Cl- ion and S2- then pitting corrosion on inner surface of tube is formed. This mechanism had been taken place continuously during operation of heat exchanger and pitting corrosion keep growing until the tube leaks.
Menciptakan Ikatan Harmonis Antara Orang Tua Dan Anak Dalam Perspektif Al-Qur’an Novi Fitriyanti; Laili Novita Sari; Ana Rahmawati
Jurnal Kajian Islam dan Sosial Keagamaan Vol. 2 No. 2 (2024): Oktober - Desember
Publisher : CV. ITTC INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

As a basis human life, the Qur'an has improved all aspects of life, including the relationship between parents and children. However, many children do not care or pay lees attantions to thair parentsparents when their parents arel elderly. In this study, researches used the interpretations of Al maraghi and Al azhar to see the attitudes, actions and relationship between children and parents in Al Isra verses 23-24. In relation to the interpretations of the Q.S Luqman 14, ath tabari and Ibnu katshir agree that allah SWT commands us to do good to our parents. Including the Qur'an, Al Isra latter verses 23-24, the interpretations of Al maraghi and Al Azhar and serveal other literatures. The results show that: children's views and actions towards parents both parties agree that a child should receive care and meet all the medsos of their parents when they are adulst.
Analisa Kegagalan pada Patahnya Sambungan Las dalam Sistem Instrumentasi Katup Pengaman Tekanan Kerja Cempaka Kusuma, Gilang; Sari, Laili Novita; Sunandrio, Hadi
JST (Jurnal Sains dan Teknologi) Vol. 12 No. 3 (2023): Oktober
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v12i3.51347

Abstract

Analisa kerusakan dilakukan dengan menerapkan serangkaian inspeksi dan pengujian terhadap sambungan las dari tube yang digunakan dalam instalasi peralatan industri minyak dan gas bumi. Kerusakan berupa patahan ditemukan pada tube yang merupakan bagian dari sistem instrumentasi katup pengaman tekanan kerja. Observasi dengan mikroskop pada perbesaran rendah memperlihatkan retakan berawal dari sisi dinding luar tube dengan morfologi patahan merupakan pola penjalaran retak fatigue. Pengujian komposisi kimia menunjukan bahwa material tube merupakan baja tahan karat tipe 316L. Analisa menggunakan scanning electron microscope pada permukaan patahan membuktikan bahwa mekanisme patahan merupakan patah getas yang merambat pada batas butir.  Berdasarkan hasil observasi, retak yang terjadi pada sambungan tube terjadi akibat beban dinamis yang timbul pada saat operasional. Penyebab utama timbulnya beban dinamis adalah fenomena getaran yang timbul dari mekanisme membuka dan menutupnya katup pengaman tekanan kerja. Fenomena getaran yang terjadi pada material tube menimbulkan retak fatiq pada daerah sambungan las yang terus merambat kemudian menyisakan luas penampang yang tidak lagi mampu menahan pembebanan sehingga menyebabkan tube patah. Beberapa rekomendasi diberikan sebagai metode pencegahan agar tidak terjadi kejadian berulang terutama pada sambungan las dari tube yang memiliki diameter kecil.
Co-Authors Amin Suhadi Amin Suhadi, Amin Ana Rahmawati Cempaka Kusuma, Gilang Eka Febriyanti febriyanti, eka Febriyanti, Eka hadi sunandrio Novi Fitriyanti Suhadi, M.Eng., Dr. Ir. Amin Sutarjo . Sutarjo .