Analisis Kegagalan Water Injection pada Vertical Roller Mill di Finish Mill PT. Holcim Tuban Plant Indonesia

Pratama, Andika (2017) Analisis Kegagalan Water Injection pada Vertical Roller Mill di Finish Mill PT. Holcim Tuban Plant Indonesia. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Vertical Roller Mill (VRM) merupakan salah satu equipment penting yang digunakan oleh PT. Holcim Tuban Plant Indonesia untuk kegiatan grinding material. Vibrasi berlebih yang ditimbulkan oleh VRM menyebabkan operasi VRM harus diberhentikan. Water injection ditambahkan pada VRM sebagai komponen yang mampu mengurangi vibrasi berlebih yang terjadi. Namun, belum dapat dimaksimalkan akibat kegagalan yang terjadi. Penelitian kali ini bertujuan untuk menganalisa kegagalan pada water injection. Beberapa pengujian dilakukan untuk mendukung hasil analisis. Uji unsur didapatkan material water injection berkesesuaian komposisinya dengan SS 301L. Pengamatan makroskopik menunjukkan adanya deformasi, penipisan, dan patahan pada permukaan pipa water injection. Pengamatan mikroskopik menunjukkan struktur mikro daerah yang terdeformasi mengalami strain hardening. Dari uji senyawa didapatkan γ-Fe sebagai fasa dominan dari material water injection. Uji fraktografi menunjukkan pola patahan yang terjadi yaitu initial crack, crack propagation, dan final crack. Dan uji kekerasan menunjukkan adanya peningkatan nilai kekerasan di daerah dekat dengan kegagalan, dari 238 BHN menjadi 268 BHN. Tahapan kagagalan yang terjadi adalah deformasi, penipisan, dan patah. Faktor yang menyebabkan kegagalan adalah pemilihan material, deformasi, dan penipisan yang mengakibatkan patah. ================================================================ Vertical Roller Mill (VRM) is one of the important equipment that used by PT. Holcim Tuban Plant Indonesia for material grinding activities in order to increase the cement production. During the process of reduction of material at VRM, it often causes high vibration. It makes the operation of VRM must be stopped. Water injection was added to the VRM as a component to reduce the excessive vibration. However, it has not been able to maximize the production process due to failure water injection. This experiment has a goal to analyze the failure of water injection. A few tests were conducted to support the analysis result. Element testing obtained water injection material corresponds with SS 301L. Macroscopic observation showed deformation, thinning, and fracture on the surface of water injection pipeline. Microscopic observation showed the microstructure of deformed area is subjected to strain hardening. Compound testing obtains γ-Fe as dominant phase of water injection material. Then fractography testing shows fracture patterns that occur are initial crack, crack propagation, and final crack. And hardness testing shows increasing of hardness from base material to the area close to failure are from 238 BHN to 268 BHN. Stages failure that happened was deformation, thinning, and fracture. Factor that causing the failure is material selection, deformation, and thinning then fracture.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Vertical Roller Mill, Water Injection, SS 301L, Deformasi, Patah, Fracture
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking
T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Pratama Andika
Date Deposited: 08 Sep 2017 07:26
Last Modified: 05 Mar 2019 04:11
URI: http://repository.its.ac.id/id/eprint/42638

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