DAFTAR ISI

HALAMAN JUDUL..........................................................................................................i

SURAT PERMOHONAN KERJA PRAKTIK...............................................................ii

BALASAN SURAT PERMOHONAN KERJA PRAKTIK...........................................iii

SURAT PERINTAH KERJA PRAKTIK.......................................................................iv

SURAT KETERANGAN KERJA PRAKTIK................................................................v

HALAMAN PENGESAHAN...........................................................................................vi

NILAI KERJA PRAKTIK...............................................................................................vii

NILAI KERJA PRAKTIK...............................................................................................viii

LEMBAR PENGESAHAN...............................................................................................ix

KATA PENGANTAR.......................................................................................................x

DAFTAR ISI......................................................................................................................xii

DAFTAR GAMBAR.........................................................................................................xv

DAFTAR TABEL..............................................................................................................xvi

BAB I PENDAHULUAN

1.1 Latar Belakang...............................................................................................................1

1.2 Alasan Pemilihan Lokasi Kerja Praktik.........................................................................2

1.3 Tujuan Kerja Praktik.....................................................................................................2

1.4 Batasan Masalah............................................................................................................2

1.5 Metode Penyusunan Laporan........................................................................................3

1.6 Sistematika Penulisan....................................................................................................3

1.7 Waktu dan Tempat Pelaksanaan KP..............................................................................3

BAB II PT. PERTAMINA (PERSERO)RU IV CILACAP

2.1 Sejarah Singkat PT. PERTAMINA (Persero) RU IV Cilacap......................................4

2.2 Pembangunan KilangMinyak PT PERTAMINA (PERSERO) RU IV.........................6

2.2.1 Kilang Minyak I..................................................................................................6

2.2.2 Kilang Minyak II.................................................................................................7

2.2.3 Kilang Paraxylene...............................................................................................9

2.2.4 Proyek Debottlenecking Cilacap (DPC)..............................................................10

2.2.5 Modernisasi Instrumen Kilang dengan DCS.......................................................13

2.3 Produksi Kilang PT. PERTAMINA (PERSERO) RU IV Cilacap dan Kapasitasnya..13

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2.4 Lokasi Dan Tata Letak..................................................................................................15

2.4.1 Lokasi Pabrik.......................................................................................................15

2.4.2 Tata Letak Kilang................................................................................................16

2.5 Visi , Misi dan Logo PT. Pertamina.............................................................................20

2.6 Visi dan Misi PERTAMINA RU IV CILACAP..........................................................22

2.7 Sistem Organisasi dan Kepegawaian Pertamina RU IV................................................24

BAB III DASAR TEORI

3.1 Rotating Equipment.......................................................................................................26

3.2 Pompa............................................................................................................................26

3.2.1 Klasifikasi Pompa................................................................................................27

3.2.2 Terminologi Pompa.............................................................................................29

3.3 Pompa Sentrifugal.........................................................................................................29

3.3.1 Prinsip Kerja Pompa Sentrifugal..........................................................................30

3.3.2 Macam-macam Pompa Sentrifugal......................................................................31

3.3.3 Jenis Impeller Pompa Sentrifugal.........................................................................32

3.3.4 Efisiensi Pompa Sentrifugal.................................................................................33

3.3.5 Kurva Performansi Pompa Sentrifugal.................................................................35

3.3.6 Sistem Proteksi Pompa Sentrifugal......................................................................35

3.3.7 Jenis Pompa Sentrifugal Menurut API.................................................................37

3.3.8 Dasar Perhitungan.................................................................................................38

BAB IV PEMBAHASAN

4.1 VIBRATION....................................................................................................................44

4.1.1 Sejarah Singkat Vibration.....................................................................................44

4.1.2 Dasar Teori...........................................................................................................44

4.1.2.1 Derajat Kebebasan.....................................................................................44

4.1.2.2 Sistem Discrete dan Kontinyu...................................................................44

4.1.2.3 Klasifikasi Getaran.....................................................................................45

4.1.2.4 Prosedur Analisis Getaran.........................................................................45

4.1.2.5 Parameter Getaran.....................................................................................45

4.2 POMPA 57P2.................................................................................................................47

4.2.1 Spesifikasi Pompa 57P2.......................................................................................47

4.2.2 Gambar Teknik Pompa 57P2................................................................................48

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4.2.3 Part List dari Gambar Teknik Pompa 57P2.........................................................49

4.3 PERMASALAHAN HIGH VIBRATION POMPA 57P2...............................................51

4.3.1 Faktor Penyebab High Vibration..........................................................................51

4.3.1.1 Unbalance.................................................................................................52

4.3.1.1.1 Kerusakan yang sering dianggap unbalance.............................52

4.3.1.2 Misalignment............................................................................................53

4.3.1.3 Mechanical Looseness (kekendoran)........................................................53

4.3.1.4 Bending (Bent Shaft).................................................................................53

4.3.1.5 Eccentric Journal / Rotor.........................................................................53

4.3.1.6 Defective Antifriction Bearing..................................................................54

4.3.2 Faktor Penyebab High Vibration pada Pompa 57P2.............................................55

4.3.2.1 Unbalance pada Impeller..........................................................................55

4.3.3 Permasalahan Akibat High Vibration Pompa 57P2...............................................57

4.3.3.1 Mechanical Seal Bocor.............................................................................57

4.3.3.2 Defect pada Ball Bearing..........................................................................59

4.3.3.3 Mechanical Looseness pada Inducer........................................................60

4.3.3.4 Kontaminasi pada Heavy Fuel Oil............................................................63

4.3.3.5 Scratch/Rubbing pada Part.......................................................................64

4.3.3 Evaluasi dan Tindak Lanjut dari High Vibration Pompa 57P2.............................65

4.3.4 Kondisi Pompa 57P2 Setelah Perbaikan................................................................68

BAB V PENUTUP

5.1. Kesimpulan...................................................................................................................69

5.2. Saran ...........................................................................................................................70

DAFTAR PUSTAKA........................................................................................................72

LAMPIRAN

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DAFTAR GAMBAR

Gambar 2.1 Lokasi Refinery Unit PERTAMINA di Seluruh Indonesia............................6

Gambar 2.2 Lokasi Pabrik PT. PERTAMINA (PERSERO RU IV Cilacap.......................16

Gambar 2.3 Logo PT. PERTAMINA..................................................................................21

Gambar 2.4 Struktur Organisasi PERTAMINA RU IV Cilacap.........................................25

Gambar 3.1 Contoh Pompa Sentrifugal...............................................................................30

Gambar 3.2 Kurva Performansi Pompa Sentrifugal............................................................35

Gambar 4.1 Gambar Teknik Pompa 57P2...........................................................................48

Gambar 4.2 High Vibration Causes....................................................................................51

Gambar 4.3 Analisa Spectrum - High Vibration Pompa 57P2............................................55

Gambar 4.4 High Vibration Pompa 57P2............................................................................57

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DAFTAR TABEL

Tabel 2.1 Kapasitas Terpasang Kilang I..............................................................................7

Tabel 2.2 Kapasitas Terpasang Kilang II............................................................................9

Tabel 2.3 Kapasitas Terpasang Kilang Paraxylene.............................................................10

Tabel 2.4 Jenis Pekerjaan dalam Proyek Debottlenecking Cilacap.....................................11

Tabel 2.5 Kapasitas di FOC I (dalam TPA)........................................................................14

Tabel 2.6 Kapasitas di FOC II (dalam TPA).......................................................................14

Tabel 2.7 Kapasitas di LOC I/II/III (dalam TPA)...............................................................14

Tabel 3.1 Jenis Pompa Sentrifugal Menurut API................................................................37

Tabel 4.1 Spesifikasi Pompa 57P2......................................................................................47

Tabel 4.2 Part Pompa 57P2 Halaman 1...............................................................................49

Tabel 4.2 Part Pompa 57P2 Halaman 2...............................................................................50

Tabel 4.3 Unbalance pada Impeller.....................................................................................56

Tabel 4.4 Mechanical Seal...................................................................................................58

Tabel 4.5 Mechanical Seal Pompa 57P2 yang mengalami crack........................................59

Tabel 4.6 Ball Bearing.........................................................................................................59

Tabel 4.7 Pemasangan Inducer............................................................................................61

Tabel 4.8 Inducer Run Out (TIR) dan Inducer Pompa 57P2...............................................62

Tabel 4.9 Kontaminasi Fluida.............................................................................................63

Tabel 4.10 Scratch/Rubbing Part.........................................................................................64

Tabel 4.11 Tindak Lanjut Perusahaan.................................................................................65

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