Monitoring Variabilitas Proses dan Mean Proses Tahap Penggilingan Akhir Produk Semen Ordinary Portland Cement (OPC) di PT. Semen Indonesia (Persero), Tbk.

Ashari, Muhammad Aris (2017) Monitoring Variabilitas Proses dan Mean Proses Tahap Penggilingan Akhir Produk Semen Ordinary Portland Cement (OPC) di PT. Semen Indonesia (Persero), Tbk. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PT. Semen Indonesia (Persero) Tbk menjadi salah satu perusahaan pendukung sektor infrastruktur di Indonesia dengan berbagai produk semen dengan kualitas terbaik. Pada penelitian kali ini akan dilakukan pengendalian kualitas terhadap proses produksi semen OPC. Semen OPC dibentuk oleh enam belas senyawa utama, yaitu CaO, MgO, SO3, Al2O3, Fe2O3, SiO2, C3Sc, C2S, C3A, C4AF, FL, Insol, LOI, Ekspansi, Mesh, dan Blaine. Berdasarkan hasil analisis yang dilakukan dapat disimpulkan bahwa seleksi variabel utama pembentuk Semen OPC menghasilkan empat senyawa utama yaitu CaO, Fe2O3, FL, dan, Insol pada uji parsial dengan menggunakan metode Backward. Pada diagram kendali I-(MR) ̅ didapatkan kesimpulan bahwa dari keempat variabel utama penyusun Semen OPC tidak ada satu pun senyawa dengan proses terkendali. Pengamatan yang dilakukan dengan diagram kendali Generalized Variance menunjukkan bahwa pada fase satu, proses telah terkendali secara statistik dengan BKA sebesar 3,954 dan BKB senilai 0. Kedua batas kendali tersebut digunakan kembali pada fase dua dengan 44 data dimana proses tidak terkendali. Pada pengamatan dengan peta kendali T2 Hotelling, proses terkendali pada fase satu dengan BKA sebesar 12,669 dan BKB = 0. Pada fase dua, proses masih belum terkendali secara statistik. Deteksi penyebab variabel out of control dengan metode PCA menunjukkan bahwa senyawa Insol merupakan variabel dengan nilai ekstraksi tertinggi sebesar 0,800. Insol memiliki kontribusi terbesar pada proses out of control pada penelitian ini. ================================================================= PT. Semen Indonesia (Persero), Tbk became one of the infrastructure support companies in Indonesia with a variety of cement products of the highest quality. In this Final Project will be done the quality control of OPC cement production process. OPC cement is formed by sixteen major compounds, namely CaO, MgO, SO3, Al2O3, Fe2O3, SiO2, C3Sc, C2S, C3A, C4AF, FL, Insol, LOI, Expantion, Mesh, and Blaine. Based on the results of the analysis, it can be concluded that the selection of the main variables forming OPC Cement produces is four main compounds namely CaO, Fe2O3, FL, and, Insol on the partial test using Backward method. In the I-(MR) ̅ control chart monitoring, obtained the conclusion that from four major variables of Cement OPC composer there is no single compound with controlled process. The observations with Generalized Variance control charts show that in Phase I, the process has been statistically controlled with the UCL of 3.954 and the LCL worth 0. Both control limits are reused in Phase II with 44 data where the process is out of control. On the observation with T2 Hotelling control chart, the controlled process in Phase I with UCL is 12.669 and LCL = 0. In Phase II, the process is still not statistically controlled. The detection of cause of out of control variable with PCA method showed that Insol compound was the variable with highest extraction value of 0,800. Insol has the greatest contribution to the out of control process in this study.

Item Type: Thesis (Undergraduate)
Additional Information: RSSt 519.86 Ash m
Uncontrolled Keywords: Backward, Diagram Kendali I-MR, Generalized Variance, PCA, Semen OPC, T2 Hotelling.
Subjects: T Technology > T Technology (General) > T58.62 Decision support systems
T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials. Laminated materials.
T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control)
Divisions: Faculty of Mathematics and Science > Statistics > 49201-(S1) Undergraduate Thesis
Depositing User: Muhammad Aris Ashari
Date Deposited: 25 Oct 2017 07:31
Last Modified: 05 Mar 2019 03:55
URI: http://repository.its.ac.id/id/eprint/48551

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