Nuriman, Muhammad Alifian (2018) Pengendalian Kualitas Proses Produksi Pupuk Urea di PT. Pupuk Sriwidjaja Palembang. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
PT. Pupuk Sriwidjaja Palembang merupakan salah satu perusahaan produsen pupuk urea di Indonesia. Untuk memenuhi kebutuhan konsumen, PT. Pupuk Sriwidjaja Palembang sangat mengutamakan kualitas pupuk urea yang baik sesuai dengan standar yang ditetapkan perusahaan. Beberapa karakteristik kualitas yang sangat diperhatikan konsumen dan perusahaan adalah Nitrogen, Biuret, Moisture, dan Mesh -6+18. Oleh karena itu perlu dilakukan pengendalian kualitas pupuk urea dengan memonitor proses produksi. Pada penelitian ini digunakan diagram kontrol kombinasi MEWMA yaitu dengan diagram kontrol M2Z2 untuk memonitor variabilitas proses dan diagram kontrol MZ untuk memonitor target proses. Hasil monitoring fase I pabrik 1B menunjukkan bahwa variabilitas proses dan target proses sudah terkendali secara statistik baik menggunakan batas kontrol dengan kriteria ATS maupun ARL, dan pada fase II menunjukkan variabilitas proses dan target proses belum terkendali statistik atau belum stabil baik menggunakan batas kontrol dengan kriteria ATS maupun ARL. Pada pabrik 3 fase I, variabilitas proses dan target proses sudah terkendali secara statistik, serta pada fase II variabilitas proses dan target proses belum terkendali secara statistik jika menggunakan batas kontrol dengan kriteria ARL. Sedangkan jika menggunakan kriteria ATS, proses belum stabil dari segi variabilitas dan sudah stabil dari segi target proses. Kapabilitas proses secara multivariat pada pabrik 1B dan pabrik 3 menunjukkan bahwa akurasi dan presisi proses belum kapabel karena nilai indeks proses MPp dan MPpk kurang dari 1.
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PT. Pupuk Sriwidjaja Palembang is one of the company that produce urea prill in Indonesia. In order to meet consumer needs, PT. Pupuk Sriwidjaja Palembang give priority for quality of urea prill that is appropiate with company’s specifications. Some of characteristic qualities of urea prill are Nitrogen, Biuret, Moisture, and Mesh -6+18. So, it is necessary to control the quality of urea prill with monitor the production process. In this study used M2Z2 control chart to detect changes in process variability. While the process target if production process is monitored by using MZ control chart. Both of these control chart are types of combination MEWMA. At factory 1B, the result of both process variability and target in phase I have been statistically controlled using control limit with ATS and ARL criteria, while in phase II both process variabilily and target have not been statistically controlled using control limit with ATS and ARL criteria. At factory 3, both process variability and target in phase I have been statistically controlled, In phase II both process variability and target have not been statistically controlled using contol limit with ARL criteria. While using ATS kriteria, process variability is not stable or have not been statistically controlled and process target have been controlled statistically or stable. The process capability analysis multiariately using MPp and MPpk shows the process has not been good capability both factory 1B and factory 3. MPp and MPpk value less than 1 indicates that the precision and accuracy of the process has not been good.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSSt 519.86 Nur p 3100018076254 |
| Uncontrolled Keywords: | Biuret, Kapabilitas, Kombinasi MEWMA, Mesh -6+18, Moisture, MZ, M2Z2, Nitrogen |
| Subjects: | T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control) |
| Divisions: | Faculty of Mathematics, Computation, and Data Science > Statistics > 49201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Alifian Nuriman |
| Date Deposited: | 14 Feb 2019 07:57 |
| Last Modified: | 23 Nov 2020 06:18 |
| URI: | http://repository.its.ac.id/id/eprint/53786 |
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