Danuputro, Sebastianus Dwi (2015) Investigasi Penyebab Kerusakan Chain Bucket Elevator Pada 7th Finish Mill Transport System Area Di Tuban IV PT. Semen Gresik. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Realisasi produksi Finish Mill berada di bawah capaian target
pada periode Oktober 2013 - Februari 2014 yang disebabkan kerusakan
berulang pada chain bucket elevator. Mengatasi hal tersebut telah
dilakukan pergantian chain asli BZK1200 dengan chain ER984. Namun,
tidak ada evaluasi dan analisa yang telah dibuat untuk menjelaskan
penyebab kerusakan tersebut.
Tugas akhir ini menganalisa penyebab kerusakan
menggunakan metode Root Cause Failure Analysis (RCFA) untuk
membuat desain yang lebih baik. Data pendukung berupa gambar
kerusakan, downtime history, kondisi aktual operasional, dan datasheet
teknik. Pengujian material dilakukan untuk memperoleh jenis material,
sifat mekanik dan pola patahan.
Jenis material chain adalah low carbon manganese steel AISI
1524. Perhitungan analitis gaya menunjukkan bahwa chain hanya
menerima gaya 133.106 kN, jauh di bawah batas yang diizinkan berada
di bawah limit stress 1200 kN. Foto SEM pada patahan
mengindikasikan terjadinya fatigue failure. Nilai kekerasan material
yaitu 47.8 HRC dan nilai ketangguhan yaitu 32.046 Joule, sehingga
material sangat keras tetapi getas. Struktur mikro mengindikasikan
terjadinya proses heat treatment saat manufaktur. ========== Finish Mill production realization was below the target from
October 2013 to February 2014 due to repeated failure of chain bucket
elevators. Action has been taken by replacing the original chain
BZK1200 with ER984. However, no evaluations and analyzes has been
made to explain the cause of failure.
The study has analyzed the cause of failure that using Root
Cause Failure Analysis (RCFA) method to design a better system.
Supporting data are pictures of damage, downtime history, actual
operational conditions, and technical datasheet. Material testing is
conducted to find the material used, its mechanical properties and
fracture patterns.
Material used for the chain is low carbon manganese steel AISI
1524. Analytical calculations shown that the chain only received
133.106 kN force, far below the allowable limit of 1200 kN. SEM photo
of fracture indicates fatigue failure. Hardness value of the material is
47.8 HRC and the toughness value is 32.046 Joule, so the material is
hard but brittle. The microstructure indicates heat treatment process
while manufactured.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 621.865 Dan i 3100015061207 |
| Uncontrolled Keywords: | Chain Bucket Elevator, Fatigue Failure |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ174 Maintenance and repair of machinery |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | - Davi Wah |
| Date Deposited: | 10 Dec 2019 02:38 |
| Last Modified: | 10 Dec 2019 02:38 |
| URI: | http://repository.its.ac.id/id/eprint/72269 |
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