sesi 4 - p&id
DESCRIPTION
gambar instrumenTRANSCRIPT
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M. Saladin Prawirasasra
Piping & Instrument Diagram
GAMBAR INSTRUMEN
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Pendahuluan❖ P&ID adalah dokumen yang menyajikan informasi
mengenai plant secara detail mengenai piping, instrument dan process equipment beserta informasi design dan spesifikasi lainnya.
❖ P&ID adalah dokumen utama yang digunakan untuk publishing, reviewing dan issuing: proses, piping, mechanical & instrumentation secara detail.
❖ P&ID selalu dimutakhirkan dalam sebuah project/plant.
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Fungsi P&ID❖ Mengetahui & memahami kondisi termutakhir dari
seluruh process equipment, instrument maupun piping yang terpasang di seluruh lokasi plant.
❖ Mengetahui dan memahami keberlangsungan jalannya proses pada setiap satuan yang terdapat di plant.
❖ Membantu petugas pengoperasian dan pemeliharaan dalam memahami pelaksanaan penganalisaan operasi satuan peralatan.
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Syarat untuk mengkaji P&ID
❖ Adanya PFD
❖ Mengerti dasar-dasar/prinsip kerja unit operasi serta kelakuan masukan dan keluarannya serta keterkaitan antar unit operasi
❖ Mengerti dasar-dasar process control
❖ Mengerti tentang process safety
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P&ID❖ Informasi dalam P&ID:
❖ Process Safety & Alarm
❖ Seluruh equipment yang digunakan
❖ Metodologi instrument lengkap
❖ Ukuran & jenis pipa
❖ Kondisi desain dari equipment
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Safety❖ Tujuan: untuk menghilangkan atau mereduksi potensi
bahaya yang potensial terjadi di dalam suatu plant.
❖ Contoh:
❖ MAWP (Maximum Allowable Working Pressure) dari vessel, pipa
❖ Pipe rating (ANSI/API rating)
❖ Sistem pembuangan fluida (flare system, burn pit)
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Alarm❖ Alarm digunakan untuk membantu
❖ Control safety dan environmental hazards
❖ mengatur hasil dan kualitas produksi maupun membatasi range operasi dari process equipment.
❖ Lifecycle dari alarm
❖ Menentukan kategori alarm yang cocok
❖ Menentukan limit kerja
❖ Konfigurasi sistem komputer
❖ Membuat prosedur respon yang tepat jika alarm dalam keadaan ON
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Alarm level
Control LoopSet Point
A A’B B’C C’D D’
Process Measurement
WARNING ALARM
CRITICAL ALARM
INSTRUMENT FAILURE
A-A’ : Normal operating rangeB-B’ : Alarm settingC-C’ : Proven Acceptable RangeD-D’ : Total Sensor Range
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Anatomi P&ID
❖ Title block
❖ Engineering drawing
❖ Notes & legends
❖ Grid system
❖ Revision block
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Title Block❖ Area pertama
❖ Judul gambar & nomor gambar -> identifikasi dan tujuan pendokumentasian
❖ Daftar lokasi/lapangan/vendor
❖ Area kedua
❖ Tanda tangan dan tanggal-tanggal persetujuan (approval) dari pihak terkait
❖ Informasi historis mengenai dokumen (pembuat, reviewer ataupun pengapproval)
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Title Block
❖ Area ketiga/ Blok referensi
❖ Berisikan daftar gambar-gambar lain yang berhubungan dengas sistem/komponen, gambar lain yang saling mereferensikan, bergantung pada konvensi di lapangan atau vendor
❖ Bermanfaat dalam mencari informasi tambahan pada sistem atau komponen di P&ID
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Title Block
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Grid System
❖ Kesulitan untuk mengidentifikasi posisi suatu equipment pada gambar
❖ Grid terdiri dari huruf, angka ataupun keduanya yang melintang secara horizontal dan vertikal
❖ Berfungsi sebagai address untuk suatu peralatan
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Grid System
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Revision Block
❖ Ketika suatu plant mengalami perubahan, maka gambar-gambar yang merefleksikan perubahan tersebut harus digambar ulang atau diterbitkan kembali (reissued).
❖ Untuk gambar yang pertama kali diterbitkan, disebut sebagai revisi ‘0’
❖ Revisi akan ditandai dengan berubahnya nomor revisi sebesar satu angka dari angka sebelumnya
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Revision block
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Revision Block❖ Terdapat dua metode revisi dalam P&ID
❖ Cloud.
❖ Triangle.
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–Johnny Appleseed
“Type a quote here.”
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Notes & Legend❖ Legenda gambar terdiri dari simbol dan garis yang
merepresentasikan suatu sistem atau komponen
❖ Catatan dan legenda gambar memberikan penjelasan simbol dan konvensi pada gambar tersebut
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Engineering Drawing
❖ Merupakan gambar mengenai aliran proses, perpipaan dan instrumentasi di deskripsikan pada bagian ini
❖ Semua simbol-simbol dan kode-kode yang dipakai dalam P&ID dapat dilihat pada legenda
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Engineering Drawing
❖ Acuan konvensi simbol:
❖ ISA-S5.1, Instrumentation symbol and identification
❖ ISA-S5.2, Binary logic diagram for Process Operation
❖ ISA-S5.3, Graphic Symbol for Distributed Control/Shared Display Instrumentation, Logic and Computer Systems
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ProcessEquipment
ControlLoop
PipingNumber
Instrumen
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Engineering Drawing
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Simbol
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Simbol
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Simbol
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Simbol
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Simbol
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Simbol
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Tag information
X Y ZInstrument Prefix:X : First letterYZ : Succeeding-lettersXYZ : Functional identification1 0 0
Loop identification
Instrument location No line : Field
Solid : Control room panelDash : Control room (behind panel)Double solid : On remote panelDouble dash : Behind remote panel
Instrument/control device
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Tag informationIdentification letter
First letter Succeeding-lettersMeasured variable Modifier Readout function Output function Modifier
A Analysis
C Control
D Differential
F Flow rate Ratio
H Hand High
I Current Indicate
L Level Low
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Tag informationIdentification letter
First letter Succeeding-letters
Measured variable Modifier Readout function Output function Modifier
P Pressure, vacuum
Q Quantity Totalizer Control
R Radiation Record
S Safety Switch
T Temperatur Transmit
V Vibration Valve, damper
Z Position Indicate Actuator
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Contoh
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Tag information
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Tag information
Locally mount instrument
Informasi lokasi
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Tag information
Panel mount instrument(visible)
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Tag information
Functioned in DCS
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Tag information
Panel mount instrument(invisible)
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Simbol line
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Elektronik transmitter
sinyal : 4-20 mA
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Pneumatic Transmitter
sinyal 3-15 psi
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Pembuatan P&ID
1 2
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Pembuatan P&ID
3 4