INVESTIGASI PENYEBAB KERUSAKAN RANTAI BUCKET ELEVATOR M2205 DI PABRIK PHOSPHORIC ACID (PA) PT. PETROKIMIA GRESIK

SUGIARTO, MOCHAMAD RULI (2016) INVESTIGASI PENYEBAB KERUSAKAN RANTAI BUCKET ELEVATOR M2205 DI PABRIK PHOSPHORIC ACID (PA) PT. PETROKIMIA GRESIK. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Produksi pabrik phosphoric acid (PA) PT. Petrokimia Gresik sering terganggu disebabkan oleh kegagalan berulang pada rantai bucket elevator. Kegagalan yang terjadi adalah putusnya link dan pen rantai bucket elevator. Penelitian ini menganalisa dan menyimulasikan penyebab kegagalan dari rantai bucket elevator. Simulasi dilakukan untuk mendapatkan penyebab utama kegagalan rantai bucket elevator dengan menggunakan metode elemen hingga. Data pendukung yang diperoleh berupa gambar kerusakan, riwayat downtime, kondisi aktual operasional dan datasheet dari rantai bucket elevator. Material yang digunakan untuk rantai adalah SCM 4/AISI 4137. Berdasarkan perhitungan analitis, gaya yang diterima rantai sebesar 17 KN, jauh di bawah batas yang diijinkan yaitu sebesar 343,35 KN. Tegangan maksimal yang diterima rantai melalui simulasi software sebesar 147,52 Mpa, dibawah tegangan maksimal yang diijinkan yaitu sebesar 415 Mpa. Berdasarkan simulasi terhadap pembebanan fatigue, rantai dapat bertahan selama 142 hari, mendekati kondisi aktual rantai sebesar 118 hari. Faktor lain penyebab kegagalan adalah misalignment antara lubang baut pada bucket dengan lubang baut pada rantai yang mengakibatkan tegangan awal sebelum pembebanan. Desain baru untuk link dalam yang telah disimulasikan menghasilkan pengurangan tegangan maksimal yang diterima rantai sebesar 16.84 Mpa atau 11.4 %. Umur link dalam meningkat sebesar 114 hari atau 80.2% dengan pembebanan yang sama. ================================================================= Factory production of phosphoric acid (PA) PT. PKG frequently interrupted due to the repeated failure of the chain bucket elevators. Failure happened is breaking links and pen chain bucket elevators. This research analyzed and simulates cause of the failure of the chain bucket elevators. Simulations performed to obtain the main cause of the failure of the chain bucket elevators by using the finite element method. Supporting Data were Obtained form of pictures of the damage, downtime history, the actual operational conditions and datasheet of the chain bucket elevators. The material used for the chain is SCM 4 / AISI 4137. Based on analytical calculations, the force received a chain of 17 KN, far below the allowable limit in the amount of 343.35 KN. Maximum stress received the chain through the simulation of software was 147.52 MPa, below the maximum allowable stress is equal to 415 Mpa. Based on the simulation of the fatigue loading, the chain can last for 142 days, closer to the actual condition of the chain at 118 days. Another factor cause of failure was the misalignment between the screw holes in the bucket with the screw holes in the chain that leads to the initial stress before loading. The new design for the inner link that has been simulated resulted in a reduction in the maximum stress received by chain to 16.84 MPa or 11.4%. The life of the inner link increased by 114 days or 80.2% with the same loading.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 621.865 Sug i
Uncontrolled Keywords: Bucket elevator, fatigue, kegagalan, link, rantai.
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ799 Diesel motor--Electronic control.
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 13 Jan 2017 09:03
Last Modified: 27 Dec 2018 07:21
URI: http://repository.its.ac.id/id/eprint/1566

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