Inventory is one of the most important elements in the production process which is continuously obtained, modified and then resold. The value of inventory must be recorded, classified according to its type which is then made into the details of each item in a given period. This study was conducted to calculate the control of water treatment chemical raw material inventory at Utility Plants at PT Pupuk Sriwidjaja, in this study the researchers used the EOQ method (Economic Order Quantity). With the implementation of the EOQ method, it is expected that the results of this study can provide solutions for the business industry to optimize the amount of stock that must be provided so that it can meet customer needs. raw material inventory when using the Economic Order Quantity (EOQ) method is the Total Reorder Point (ROP) for the four factories which is 21,931.31, Total Safety Stock is 93,844 kg, the Total Inventory Cost for the three raw materials is Rp 1,176,557,818. There are differences made between the determination of raw material inventories applied by the company using the Economic Order Quantity (EOQ) method can be seen from the frequency of purchases, total purchases, Total Inventory Cost

Aufa, Aisah

Indonesian

Musi Charitas Catholic University Repository

v  DAFTAR ISI  HALAMAN JUDUL  ................................................................................... i HALAMAN PENGESAHAN ..................................................................... ii KATA PENGANTAR ................................................................................. iii DAFTAR ISI ................................................................................................ v DAFTAR TABEL ........................................................................................ ix DAFTAR GAMBAR  .................................................................................. xi DAFTAR LAMPIRAN ................................................................................ xii ABSTRACT ................................................................................................... xiii  BAB I  PENDAHULUAN 1.1   Profil PT Pupuk Sriwidjaja .............................................................. I-1 1.2   Sejarah Singkat PT Pupuk Sriwidjaja .............................................. I-1 1.3   Lokasi Perusahaan dan Luas Lahan ................................................. I-7          I.3.1   Lokasi PT Pupuk Sriwidjaja ................................................. I-7          I.3.2   Layout PT Pupuk Sriwidjaja ................................................. I-7 1.4   Visi dan Misi Perusahaan  ................................................................ I-9 1.5   Makna Logo  .................................................................................... I-10 1.6   Produk Yang Dihasilkan  ................................................................. I-12 1.7   Ketenagakerjaan  .............................................................................. I-13  BAB II  Proses Produksi  2.1    Bahan Baku dan Bahan Pembantu .................................................. II-1          2.1.1   Jenis Bahan Baku ................................................................. II-1          2.1.2   Bahan Pembantu .................................................................. II-2 2.2   Pengadaan Bahan Baku .................................................................... II-2 2.3   Proses Produksi ................................................................................ II-2          2.3.1   Fasilitas Yang Digunakan .................................................... II-2          2.3.2   Urutan Proses  ...................................................................... II-4 2.4   Hasil Produksi .................................................................................. II-17 vi   BAB III Struktur Organisasi Perusahaan   3.1    Bentuk-Bentuk Organisasi .............................................................. III-1 3.2    Organisasi Perusahaan .................................................................... III-2 3.3    Pembagian Tugas dan Wewenang .................................................. III-5   BAB IV  Keselamatan dan Kesehatan Kerja (K3)  4.1    Pasal-Pasal Yang Berkaitan Dengan K3 ......................................... IV-1          4.1.1   Undang-Undang RI No.1 Tahun 1970 Tentang Keselamatan                          Kerja  .................................................................................... IV-1          4.1.2   Undang-Undang RI No.23 Tahun 1992 Tentang Kesehatan                       .............................................................................................. IV-10 4.2   Penyakit Yang Dianalisis Akibat Kerja ........................................... IV-40 4.3   Alat-Alat Proteksi Diri ..................................................................... IV-40 4.4   K3 di PT Pupuk Sriwidjaja .............................................................. IV-44       BAB V  Tugas Khusus 5.1    Pendahuluan .................................................................................. V-1          5.1.1   Latar Belakang Masalah ....................................................... V-1          5.1.2   Rumusan Masalah  ............................................................... V-3          5.1.3   Tujuan Penelitian  ................................................................ V-3          5.1.4   Ruang Lingkup Masalah  ..................................................... V-3          5.1.5   Sistematika Laporan  ............................................................ V-4 5.2   Landasan Teori .............................................................................. V-7         5.2.1   Definisi Persediaan .............................................................. V-7         5.2.2   Tujuan Persediaan ................................................................ V-7         5.2.3   Fungsi Persediaan  ............................................................... V-8         5.2.4   Jenis-Jenis Persediaan .......................................................... V-8         5.2.5   Biaya-Biaya Persediaan ....................................................... V-9         5.2.6   Pengendalian Persediaan ...................................................... V-10         5.2.7   Tujuan Pengendalian Persediaan ......................................... V-11 vii          5.2.8   Fungsi Pengendalian Persediaan .......................................... V-11         5.2.9   Metode dan Model Pengendalian Persediaan ...................... V-12                     A.   Model Pengendalian Deterministik ............................... V-12                     B.    Model Pengendalian Probabilistik ................................ V-12          5.2.10 Peramalan ............................................................................. V-13          5.2.11 Economic Order Quantity (EOQ) ........................................ V-15 5.3    Metode Penelitian .......................................................................... V-19          5.3.1   Studi Lapangan..................................................................... V-19          5.3.2   Identifikasi Masalah ............................................................. V-20          5.3.3   Tujuan Penelitian ................................................................. V-20          5.3.4   Studi Pustaka ........................................................................ V-20          5.3.5   Pengumpulan Data  .............................................................. V-20          5.3.6   Pengolahan Data  ................................................................. V-20          5.3.7   Pembahasan .......................................................................... V-21          5.3.8   Simpulan dan Saran ............................................................. V-21          5.3.9   Flowchart Metodologi Penelitian ........................................ V-22 5.4    Pengumpulan dan Pengolahan Data ........................................... V-23          5.4.1   Pengumpulan Data ............................................................... V-23          5.4.2   Pengolahan Data .................................................................. V-29                    5.4.2.1  Peramalan ................................................................ V-29                    5.4.2.2  Perhitungan EOQ .................................................... V-31                     5.4.2.3  Penentuan Persediaan Pengaman (Safety Stock) ..... V-35                     5.4.2.4  Penentuan Reorder Point (ROP) ............................. V-43                     2.3.2.5  Perhitungan Total Biaya Persediaan Bahan Baku Kimia                                                                          Water Treatment..................................................... V-45 5.5   Analisis dan Intepretasi Hasil  ...................................................... V-47              5.5.1  Analisa Perbandingan Volume Pemesanan Bahan Baku Kimia                           Water Treatment Berdasarkan Metode Economic Order Quantity                       (EOQ)  dengan Volume Pemesanan Perusahaan ...................... V-47             5.5.2  Analisa Perbandingan Frekuensi Pemesanan Bahan Baku Kimia                       Water Treatment Berdasarkan Metode Economic Order Quantity     viii                       (EOQ) dengan Frekuensi Pemesanan Perusahaan  ................... V-48             5.5.3  Analisa Perbandingan Total Biaya Persediaan Bahan Baku Kimia                         Water Treatment Berdasarkan Metode Economic Order Quantity                         (EOQ) dengan Total Biaya Persediaan Perusahaan  ............... V-49 5.5.4  Analisa Pengendalian Persediaan Bahan Baku Kimia  Water                       Treatment Dengan Memperhatikan Asumsi-Asumsi Berdasarkan                            Metode Economic Order Quantity  (EOQ) ............................. V-50 5.6    Kesimpulan dan Saran ................................................................. V-51          5.6.1   Kesimpulan .......................................................................... V-52          5.6.2   Saran ..................................................................................... V-54 DAFTAR PUSTAKA LAMPIRAN     ix  DAFTAR TABEL  Tabel I.1      Makna Logo PT Pupuk Sriwidjaja ............................................ I-10 Tabel II.2     Jenis Peralatan Pada Proses Pembuatan Amonia ...................... II-3 Tabel II.3     Jenis Peralatan Pada Proses Pembuatan Urea ............................. II-4 Tabel V.4     Data pemakaian            Solid 2016 ..................................... V-22 Tabel V.5     Data pemakaian            Solid 2017 ..................................... V-22 Tabel V.6     Data pemakaian            Solid 2018 ..................................... V-23 Tabel V.7     Data pemakaian      Liquid  2016 ......................................... V-24 Tabel V.8     Data pemakaian      Liquid  2017 ......................................... V-24 Tabel V.9     Data pemakaian      Liquid  2018 ......................................... V-24 Tabel V.10   Data pemakaian       Liquid  2016 ......................................... V-25 Tabel V.11   Data pemakaian       Liquid  2017 ......................................... V-26 Tabel V.12   Data pemakaian       Liquid  2018 ......................................... V-26 Tabel V.13   Biaya Simpan Produk ............................................................... V-27 Tabel V.14   Biaya Pesan Produk .................................................................. V-27 Tabel V.15   Harga Produk ............................................................................ V-27 Tabel V.16   Lead Time ................................................................................. V-28 Tabel V.17  Rekapitulasi Nilai MAD Untuk Hasil Peramalan dengan Dua Metode                       ..................................................................................................... V-29 Tabel V.18   Data Hasil Ramalan            Solid  2019 .............................. V-29 Tabel V.19   Data Hasil Ramalan      Liquid  2019 .................................. V-30 Tabel V.20   Data Hasil Ramalan       Liquid  2019 .................................. V-30 Tabel V.21   Rekapitulasi Data Bahan Baku Kimia Water Treatment pada                       Pusri IB ..................................................................................... V-31 Tabel V.22   Rekapitulasi Data Bahan Baku Kimia Water Treatment pada                       Pusri II ...................................................................................... V-31 Tabel V.23   Rekapitulasi Data Bahan Baku Kimia Water Treatment pada                       Pusri III ..................................................................................... V-31 Tabel V.24   Rekapitulasi Data Bahan Baku Kimia Water Treatment pada  x                       Pusri IV ..................................................................................... V-32 Tabel V.25  Rekapitulasi Hasil Perhitungan EOQ ........................................ V-34 Tabel V.26  Rekapitulasi Frekuensi Pembelian ............................................. V-34 Tabel V.27  Deviasi            Solid pada Pusri IB .................................... V-35 Tabel V.28  Rekapitulasi Hasil Perhitungan Safety Stock NaOH Liquid di Pabrik                          Pusri IB ...................................................................................... V-36 Tabel V.29  Rekapitulasi Hasil Perhitungan Safety Stock              di Pabrik                      Pusri IB ...................................................................................... V-36 Tabel V.30  Deviasi            Solid pada Pusri II ...................................... V-37 Tabel V.31  Rekapitulasi Hasil Perhitungan Safety Stock NaOH Liquid di Pabrik                       Pusri II ....................................................................................... V-38 Tabel V.32  Rekapitulasi Hasil Perhitungan Safety Stock              di Pabrik                          Pusri II ....................................................................................... V-38 Tabel V.33  Deviasi            Solid pada Pusri III .................................... V-39 Tabel V.34  Rekapitulasi Hasil Perhitungan Safety Stock NaOH Liquid di Pabrik                                     Pusri III ...................................................................................... V-40 Tabel II.35  Rekapitulasi Hasil Perhitungan Safety Stock              di Pabrik                          Pusri III ...................................................................................... V-40 Tabel V.36  Deviasi            Solid pada Pusri IV .................................... V-41 Tabel V.37  Rekapitulasi Hasil Perhitungan Safety Stock NaOH Liquid di Pabrik                                     Pusri IV ...................................................................................... V-42 Tabel V.38  Rekapitulasi Hasil Perhitungan Safety Stock              di Pabrik                          Pusri IV ...................................................................................... V-42 Tabel V.39  Rekapitulasi Hasil Perhitungan ROP ......................................... V-44 Tabel V.40  Rekapitulasi Perhitungan TIC ................................................... V-46 Tabel V.41  Perbandingan Volume Pemesanan ............................................ V-50 Tabel V.42  Perbandingan Frekuensi Pemesanan ......................................... V-51 Tabel V.43  Perbandingan Total Biaya Persediaan ....................................... V-51   xi  DAFTAR GAMBAR  Gambar I.1        Tampak Pabrik Pusri ........................................................... I-2 Gambar I.2        Pupuk Indonesia Holding Company .................................... I-6 Gambar I.3        Layout Kompleks PT Pusri Palembang ............................... I-8 Gambar I.4        Logo PT Pupuk Sriwidjaja .................................................. I-10 Gambar I.5        Pupuk Urea PT Pupuk Sriwidjaja ........................................ I-12 Gambar I.6        Benih Padi Pusri Seed PT Pupuk Sriwidjaja ....................... I-12 ....................................................................................................................... Gambar II.7       Blok Diagram Pembuatan Amonia ..................................... II-5 Gambar II.8       Blok Diagaram Feed Treating ............................................ II-6 Gambar II.9       Blok Diagram Reforming .................................................... II-8 Gambar II.10     Proses Pembuatan Urea ....................................................... II-11 Gambar II.11     Blok Diagram Pembuatan Urea .......................................... II-12 Gambar II.12     Blok Diagram Pabrik Utilitas .............................................. II-15 Gambar III.13   Struktur Organisasi Departemen Rendal Produksi .............. III-1 Gambar III.14   Struktur Organisasi Perusahaan PT Pupuk Sriwidjaja ......... III-4 Gambar III.15   Struktur Organisasi PT Pupuk Sriwidjaja ............................ III-5 Gambar IV.16   Kotak P3K ........................................................................... IV-47 Gambar IV.17   Kotak P3K ........................................................................... IV-47 Gambar IV.18   APAR (Alat Pemadam Api Ringan) .................................... IV-48 Gambar IV.19   APAR (Alat Pemadam Api Ringan) .................................... IV-48 Gambar IV.20   Ketentuan Masuk Area Pabrik ............................................. IV-49 Gambar IV.21   Badge Area Pabrik ............................................................... IV-49 Gambar V.22    Grafik EOQ .......................................................................... V-14 Gambar V.23    Grafik EOQ .......................................................................... V-15 Gambar V.24    Flowchart Metodologi Penelitian ........................................ V-21 Gambar V.25    Grafik Pemakaian            Solid (Tawas)  2016-2018 ....... V-23 Gambar V.26    Grafik Pemakaian      Liquid (Caustic Soda) 2016-2018 V-25 Gambar V.27    Grafik Pemakaian       Liquid  (Asam Sulfat) 2016-2018 ... V-27  xii  DAFTAR LAMPIRAN  Lampiran 1      Area Penyimpanan Gudang Kimia ....................................... L-1 Lampiran 2      Surat Keterangan Selesai Kerja Praktik di PT Pusri ............. L-2 Lampiran 3      Daftar Nilai Mahasiswa Kerja Praktik di PT Pusri ................. L-3 Lampiran 4      Catatan Kegiatan Harian Mahasiswa Kerja Praktik di PT Pusri                               .............................................................................................. L-4 Lampiran 5      Daftar Hadir Mahasiswa Kerja Praktik PT Pusri .................. L-6 Lampiran 6      Kartu Konsultasi Kerja Praktik Mahasiswa UKMC ............. L-9 Lampiran 7      Lembar Revisi Mahasiswa .................................................... L-10     

Pengendalian Persediaan Bahan Baku Kimia Water Treatment (  Solid,   Liquid, dan    Liquid) Pada Pabrik Utilitas Dengan Menggunakan Metode Economic Order Quantity (EOQ)

(Studi Kasus : PT Pupuk Sriwidjaja Palembang)

http://eprints.ukmc.ac.id/2881/3/KP-TI-2019-1612018-tableofcontent.pdf

Pengendalian Persediaan Bahan Baku Kimia Water Treatment ( Solid, Liquid, dan Liquid) Pada Pabrik Utilitas Dengan Menggunakan Metode Economic Order Quantity (EOQ) (Studi Kasus : PT Pupuk Sriwidjaja Palembang)

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