Pengontrolan Proses Pengolahan Air Pada Cooling Water Di PT.XYZ Menggunakan Diagram Kontrol MEWMA Dan MEWMV

Hildayani, Windy (2015) Pengontrolan Proses Pengolahan Air Pada Cooling Water Di PT.XYZ Menggunakan Diagram Kontrol MEWMA Dan MEWMV. Undergraduate thesis, Institut Technology Sepuluh Nopember.

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Abstract

Sumber daya air di Indonesia semakin langka karena penggunaan yang tidak optimal, oleh karena itu upaya penghematan air sangat diperlukan salah satunya yaitu dengan melakukan daur ulang air limbah untuk penggunaan Cooling Water. PT. XYZ merupakan sebuah perusahaan yang bergerak dalam bidang pengolahan air dimana pengontrolan dilakukan dengan menggunakan Cooling Water. Kualitas air diukur dengan variabel pH dan kekeruhan, dimana kedua vaiabel tersebut saling berkorelasi. Selama ini pengontrolan pH dan kekeruhan yang dilakukan oleh perusahaan menggunakan Generalized Variance dan T2-Hotelling tidak dapat mendeteksi pergeseran yang kecil. Berdasarkan hal tersebut, penelitian ini bertujuan untuk mengetahui pergeseran proses yang kecil pada pH dan kekeruhan yang tidak dapat dideteksi oleh diagram kontrol Generalized Variance dan T2-Hotelling, sehingga pengontrolan proses pH dan kekeruhan dilakukan dengan diagram kontrol MEWMV dan MEWMA. Hasil analisis menggunakan diagram kontrol MEWMV belum terkendali dengan λ=0,4 ω=0,3 karena terdapat 8 titik yang out of control. Pada diagram kontrol MEWMA didapatkan hasil bahwa proses belum terkendali dengan pembobot λ=0,4 dengan 52 titik out of control. Hasil kapabilitas proses secara univariat untuk pH dan kekeruhan berturut-turut didapatkan hasil 0,1 dan 13,03 sehingga pH secara individu tidak kapabel tetapi kekeruhan sudah kapabel, sedangkan pada secara multivariat didapatkan hasil 1,131 sehingga secara multivariat sudah kapabel. ======================================================================================================== Water resources in Indonesia are increasingly rare because of not maximally used, therefore water saving measures are very needful one of them is to recycle wastewater for Cooling Water. PT. XYZ is a company that works for water treatment purification and using Cooling Water to controling. Water’s quality was measured with pH and turbidity, both are mutually correlated variabel. During this time, pH and turbidity was controled using the Generalized Variance and T2- Hotelling control chart and it can not detect small shifts. Based on this, the goal from this research is to detect small shift process in pH and turbidity that can not be detected by the Generalized Variance and T2- Hotelling control chart, so that the pH and turbidity process control was performed by the MEWMV and MEWMA control chart. The results of analysis using MEWMV control chart is not in control with ω= 0.4 λ = 0.3 because there are 8 points out of control. At MEWMA control chart showed that the process is not in control by λ = 0.4 with 52 points out of control. The results of univariate process performance capability for pH and turbidity its known that 0.1 and 13.03 so that individually are not capable but already capable at turbidity, whereas the multivariate analysis showed that performance capability indices is 1,131, so that multivariate performance capability already capable.

Item Type: Thesis (Undergraduate)
Additional Information: RSSt 519.82 Hil p
Uncontrolled Keywords: Air, Cooling Water, MEWMA, MEWMV, pH
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD259.2 Drinking water. Water quality
Divisions: Faculty of Mathematics and Science > Statistics > (S1) Undergraduate Theses
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 21 Nov 2018 07:50
Last Modified: 21 Nov 2018 07:50
URI: http://repository.its.ac.id/id/eprint/59981

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