Pengendalian Kualitas Pupuk Npk di PT Pupuk Sriwidjaja (PUSRI) Palembang Menggunakan Peta Kendali Maximum Multivariate Cumulative Sum (Max-MCUSUM)
Submission Date: 2018-07-30 17:06:59
Accepted Date: 2019-02-09 00:00:00
Abstract
Pupuk NPK merupakan produk pupuk yang baru diproduksi oleh PT Pupuk Sriwidjaja yang sangat mengutamakan kualitas agar pupuk NPK PT PUSRI dapat bersaing, sehingga tidak terjadi kerugian secara finansial bagi produsen dan secara penggunaan bagi konsumen. Dalam penelitian ini, akan dilakukan pengendalian kualitas secara statistik pada pupuk NPK melalui peta kendali. Penelitian akan dilakukan pada 3 variabel utama dan terpenting dalam komposisi pupuk NPK, yaitu nitrogen (N), phospat (P) dan kalium (K), dimana variabel penelitian memiliki hubungan satu sama lain dan memiliki pergeseran proses yang kecil yaitu sebesar 0,92σ, 0,11σ dan 0,18σ. Maka digunakan peta kendali Max-MCUSUM yang lebih sensitif dalam mendeteksi pergeseran proses yang kecil, serta efektif karena memonitor rata-rata dan variabilitas secara simultan dalam satu peta kendali. Setelah dilakukan simulasi, didapatkan batas interval (h) sebesar 29.89. Hasil dari penelitian menggunakan peta kendali Max-MCUSUM pada proses produksi pupuk NPK fase I adalah telah terkendali secara statistik setelah dilakukan identifikasi terhadap penyebab titik yang keluar batas interval dan dilakukan perbaikan. Sedangkan pada fase II, proses produksi pupuk NPK belum terkendali secara statistik Hal ini dikarenakan masih terdapat titik pengamatan yang berada di atas batas interval (h) yang disimbolkan dengan C+. Kemudian, pada perhitungan kapabilitas proses, dapat diketahui bahwa secara multivariat, nilai indeks kapabilitas kinerja proses baik MPp maupun MPpk kurang dari 1. Sehingga dapat disimpulkan bahwa proses produksi pupuk NPK pada PT PUSRI belum kapabel karena memiliki tingkat presisi dan akurasi yang rendah. Analisis Kapalitas; Pengendalian Kualitas Statistika; Peta Kendali Max-MCUSUM; Pupuk NPK; PT Pupuk Sriwidjaja Palembang
Keywords
Analisis Kapalitas, Pengendalian Kualitas Statistika, Peta Kendali Max-MCUSUM; Pupuk NPK; PT Pupuk Sriwidjaja Palembang
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