Analisa Kegagalan Kopling Fluida 18M3114 di Pabrik NPK-3 PT. Petrokimia Gresik

Priambadha, Genki Ramadyan (2015) Analisa Kegagalan Kopling Fluida 18M3114 di Pabrik NPK-3 PT. Petrokimia Gresik. Undergraduate thesis, Institut Technology Sepuluh Nopember.

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Abstract

Kopling fluida merupakan komponen penting pada penggerak mesin pengering pupuk yang berfungsi sebagai transmitor kecepatan. Pada tanggal 01 Oktober 2014, kegagalan dialami oleh kopling fluida 18M3114 di Pabrik NPK-3 yang pecah menjadi tiga bagian. Dari hasil pengujian Optical Emission Spectrometry (OES) diketahui bahwa material komponen ini memenuhi standar Al EN AB – AlSi11Cu2(Fe). Uji kekerasan dengan metode vickers dilakukan untuk membandingkan distribusi kekerasan material dengan standar. Nilai kekerasan spesimen sebesar 79.48 HVN sedangkan standar material adalah 90 HVN. Hal ini menunjukkan bahwa material tersebut tidak memenuhi standar operasional. Nilai tegangan dari hasil analisa perhitungan dengan metode Tresca sebesar 196,88 MPa dimana tegangan ini melebihi batas maksimal tegangan yang diperbolehkan yaitu sebesar 140 Mpa. Pola patahan ditunjukkan dengan hasil analisa SEM dan foto makro yang memperlihatkan adanya initial dan final crack sebagai akibat dari beban berlebih yang diberikan secara terus menerus dan material yang tidak memenuhi standar. ========================================================================================================= Fluid coupling is an important component in the fertilizer drying machine driver which functioned as speed transmitter. On October 1st 2014, fluid coupling 18M3114 suffered failure in NPK-3 plant which broke into three pieces. From Optical Emission Spectrometry (OES) analysis, it was identified that the material used for the component is in accordance with Al EN AB – AlSi11Cu2(Fe) standard. Hardness test using Vickers method was conducted to compare the hardness number distribution in the material to the distribution in the standard. Hardness value measured for the specimen is 79.48 VHN while the standard material is 90 VHN. This indicated that the material didn’t met the operational standard. Stress value calculated using Tresca method was 196,88 MPa which is exceeded the allowed maximum stress, 140 Mpa. Fracture pattern shown by SEM analysis and macro-visual analysis showed the initial and final crack as a result of constant over-loading and an inappropriate material in accordance to the operational standard.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 620.112 6 Pri a
Uncontrolled Keywords: Kopling fluida, Al EN AB – AlSi11Cu2(Fe), Fracture, Overload
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics.
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 20 Nov 2019 03:04
Last Modified: 20 Nov 2019 03:04
URI: https://repository.its.ac.id/id/eprint/71908

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