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febriyanti, eka
BPPT
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FC febriyanti, eka
Majalah Ilmiah Pengkajian Industri Vol 11, No 1 (2017): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1223.835 KB) | DOI: 10.29122/mipi.v11i1.2079

Abstract

PF Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 9, No 1 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (672.16 KB) | DOI: 10.29122/mipi.v9i1.1792

Abstract

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.
PREFACE Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 9, No 2 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (19.554 KB) | DOI: 10.29122/mipi.v9i2.1827

Abstract

PREFACE
FRONT COVER Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 9, No 2 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.644 KB) | DOI: 10.29122/mipi.v9i2.1826

Abstract

FC
ABS Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 9, No 1 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (677.421 KB) | DOI: 10.29122/mipi.v9i1.1793

Abstract

ABSTRACT Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 9, No 2 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (20.991 KB) | DOI: 10.29122/mipi.v9i2.1828

Abstract

ABS
Preface Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 9, No 3 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (197.407 KB) | DOI: 10.29122/mipi.v9i3.1784

Abstract

PREFACE Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 10, No 2 (2016): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (53.778 KB) | DOI: 10.29122/mipi.v10i2.1816

Abstract

ANALISIS KEGAGALAN SCREW PENYEBAB KERUSAKAN DECANTER SHAFT PADA UNIT PENGOLAHAN MINYAK Febriyanti, Eka
Majalah Ilmiah Pengkajian Industri Vol 11, No 3 (2017): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (757.103 KB) | DOI: 10.29122/mipi.v11i3.2524

Abstract

Decanter merupakan mesin industri pada unit pengolahan minyak yang berfungsi untuk memisahkan sludge dari crude oil tank menjadi light phase, heavy phase dan solid  dalam crude oil sehingga proses pemisahan selanjutnya di dalam clarier settling tank akan lebih sempurna. Shaft merupakan salah satu bagian dari decanter yang berhenti beroperasi setelah pengoperasian satu tahun. Selanjutnya setelah dilakukan investigasi di tempat kejadian menunjukkan bahwa screw dari shaft mengalami patah sehingga menyebabkan decanter berhenti beroperasi. Hasil pemeriksaan visual menunjukkan bahwa screw mengalami perpatahan/rusak di daerah radius. Sedangkan pemeriksaan fraktografi menunjukkan bahwa foto makro permukaan patahan screw berupa patah ulet yang berawal dari satu sisi dan merambat hingga mencapai penjalaran retak sebesar 70%, namun patah sisa/patah akhir  yang terletak berseberangan dengan patah awal. Hasil pemeriksaan tersebut juga dikonfirmasi dengan pemeriksaan metalografi yang menunjukkan adanya inklusi pengotor di lokasi perpatahan screw. Oleh karena itu, cacat inklusi akibat proses manufaktur berperan sebagai inisiasi perambatan retak, lalu menjalar akibat pembebanan dinamis dari pergerakan shaft sampai akhirnya baut mengalami perpatahan. Analisis kimia dari material screw menunjukkan bahwa material screw yang diperiksa merupakan jenis low alloy steel yang sesuai dengan spesifikasi standard.
Co-Authors Amin Suhadi, Amin Dedi Supriadi Laili Novita Sari Rini Riastuti, Rini