Triantoro, Brian Hariman (2019) Analisa Kegagalan Pada Shaft Mesin Circulating Water Pump Pada Pembangkit Listrik PT. X. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Mesin circulating water pump (CWP) adalah mesin yang digunakkan sebagai pendingin dalam sistem pembangkit listrik dengan cara memompakan air laut. Shaft merupakan bagian dari mesin CWP yang digunakkan untuk menyalurkan gaya dari mesin motor ke propeler pompa. Penelitian ini dilakukan untuk menganalisa faktor penyebab, mekanisme kegagalan, serta solusi yang dapat digunakan pada kegagalan shaft CWP. Beberapa pengujian dilakukan untuk mendukung analisa ini. Beberapa pengujian tersebut yaitu pengujian makro, pengujian komposisi, pengujian metalografi, pengujian kekerasan, SEM dan XRD. Hasil pengujian makro didapatkan lokasi initial crack, crack propagation, final crack dan defect. Hasil uji komposisi menampilkan material shaft adalah stainless steel 316. Pengujian metalografi menunjukan struktur mikro adalah austenit. Pengujian SEM dilakukan untuk mengetahui permukaan pada daerah initial crack, crack propagation, dan final crack. Uji kekerasan menunjukkan bahwa nilai kekerasan yang dekat patahan lebih besar daripada daerah jauh dari patahan. Pengujian XRD menghasilkan tegangan sisa dekat permukaan lebih tinggi dengan nilai 494,08 MPa dibandingkan yang jauh dari permukaan sebesar 204,58 MPa. Setelah dilakukannya pengujian-pengujian tersebut didapatkan faktor penyebab kegagalan yaitu besarnya beban yang diterima shaft dengan nilai 162,19 MPa sehingga menyebabkan shaft cepat mengalami patah lelah selain itu adanya korosi yang berupa FeCl2 dan Fe¬3O4 juga mempercepat shaft mengalami kegagalan. Mekanisme kegagalan shaft diawali adanya initial crack pada daerah keyway karena adanya pemusatan tegangan dan kemudian retakan merambat pada permukaan sebelum terjadi final crack dikarenakan shaft tidak mampu menahan tegangan yang terjadi.
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Circulating water pump (CWP) is a machine that is used as a condenser in a power plant system by pumping the seawater. Shaft is a part of CWP that is used to transmit force from the motor engine to the pump’s propeller. This study was conducted to analyze the factors, failure mechanism and solutions that can be used in CWP shaft failures. Several tests were carried out to support this analysis. These tests are macro testing, composition testing, metalography, SEM and XRD. From macro test result obtained the location of initial cracks, crack propagation, final cracks and defects. From composition test using optical electron microscopy (OES) shows that the shaft material is stainless steel 316. Metallography shows that the microstructure of the material is austenite. SEM testing was carried out to determine the surface in the initial crack, crack propagation, and final crack. From the result of hardness test shows that the hardness value near the surface is greater than the farther from the surface. From XRD residual stress in the edge of surface is higher 494,08 MPa and the farthest is 204,58MPa After doing these tests, it was found that the factor causing the failure were the amount of load received by the shaft with 162,1935MPa, causing the shaft to quickly experience fatigue, beside that the presence of corrosion by FeCl2 and Fe3O4 also accelerated the shaft to fail. The shaft failure mechanism begins with the initial crack in the keyway because of the concentration of stress in there and then the crack propagate on the surface before the final crack occurs because the shaft is unable to whitstand the stresses.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSMt 620.112 Tri a-1 2019 |
| Uncontrolled Keywords: | Shaft, circulating water pump, analisa kegagalan, korosi |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control) |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | obibrian obibrian |
| Date Deposited: | 08 Jun 2023 02:39 |
| Last Modified: | 08 Jun 2023 02:39 |
| URI: | http://repository.its.ac.id/id/eprint/65185 |
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