BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Badan Operasi Bersama PT. Bumi Siak Pusako – Pertamina Hulu CPP Block, Central Sumatera Basin
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007. Hendri, ST, MT
Disclaimer:
Pressure Gauge:
Selection, Installation, Operation, Maintenance & Calibration Course No. : MTC-PDD-INST-TR-001
Maintenance and PG & T Department – Instrument Pedada Area © Copyright 2007. Hendri, ST, MT
Neither I, Hendri, my company, BOB, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product on this training material. Responsibility for the selection, use, and maintenance of any product on this training material remains with the purchaser and enduser.
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Silabus
Dasar-dasar pengukuran tekanan. Sensor, karakteristik statis & kalibrasi. Pressure Gauge.
Pedada, 20 May 2007
Komponen utama + aksesoris. Pemilihan. Instalasi, pengoperasian, perawatan & kalibrasi.
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Dasar-dasar Pengukuran Tekanan
Pedada, 20 May 2007
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Definisi tekanan
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Pengukuran tekanan
Gaya F yang bekerja atau terdistribusi pada suatu permukaan A
Tekanan yang bekerja pada titik P di dalam cairan: P = F / A = hw
F
dengan, h = jarak dari permukaan ke titik P w = berat cairan
P
A
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Pedada, 20 May 2007
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Penentuan level cairan melalui pengukuran tekanan
Penentuan level cairan melalui harga density (ρ)
h = P/ρg
h = P/ρg
dengan, h = jarak dari permukaan ke titik P P = tekanan ρ = density g = percepatan gravitasi
dengan, h = jarak dari permukaan ke titik P P = tekanan ρ = density g = percepatan gravitasi
Hendri, ST, MT
Hendri, ST, MT
h P
ρair > ρpelampung 1
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Bonu
s!
ρ pelampung 2 ρminyak
h2
ρpelampung 1 h1
ρair
> ρminyak > ρpelampung 2 8 of 45
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
= 51,714 mmHg
Jenis-jenis Pengukuran Tekanan
1 inci
2
= 2,0359 inHg
= 27,680 inH2O
= 6,8946 kPa 1 bar
= 14,504 psi
1 atm.
= 14,696 psi
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Satuan Tekanan 1 psi
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Air (ρ=1)
1 ft. 0,433 psi
+
1 ft. 0,433 psi
+
0,31 ft. 0,134 psi
=
Gauge. Absolut. Diferensial. Compound. Vacuum.
Tekanan gauge Tekanan absolut
2,31 ft.
Compound
1 atm 14,7 psia
1 psi
Tekanan diferensial
Vacuum Total vacuum/absolut
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Sensor Tekanan (A) C-shaped Bourdon tube.
Sensor Tekanan, Karakteristik Statis & Kalibrasi
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(A)
(B)
(C)
(D)
(B) Helical Bourdon tube. (C) Diaphragm. (D) Bellows.
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
© Copyright 2007.
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Hendri, ST, MT
Span
Jangkauan (range/span) Akurasi Repeatability Linierity Hysteresis
Jangkauan pengukuran sensor Span = batas maksimum – batas minimum 0 psig
0 inH20
0 bar
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Jangkauan sensor
Jangkauan sensor
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area © Copyright 2007. Hendri, ST, MT
Repeatability
Error 3
Error 1 100 psig
Kedekatan beberapa hasil pengukuran terhadap harga rata-ratanya. Tekanan
Tekanan acuan
Error 2
Tekanan acuan
100 psig = Hasil pembacaan
Harga rata-rata hasil pembacaan
pengukuran
= Hasil pembacaan
Umumnya dinyatakan oleh:
Pedada, 20 May 2007
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Hendri, ST, MT
Kedekatan hasil pembacaan dengan harga acuan standar.
250 bar
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Tekanan
100 psig
750 inH20
Jangkauan sensor
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Akurasi
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Karakteristik Statis Sensor
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
pengukuran
% dari span, misal: 0,5 % dari span. % dari pembacaan (reading), misal: 1% dari pembacaan. 15 of 45
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Linierity
Hysteresis
Umumnya sensor didisain untuk dapat menghasilkan hubungan yang linier antara hasil pengukuran dengan besaran yang diukur.
Hasil pembacaan (% dari span)
100
Akurasi (% dari span)
= Besaran yang diukur = Hasil pengukuran Besaran uji (% dari span)
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100 Zero shift Hendri - 22197
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Pedada, 20 May 2007
0
Besaran uji (% dari span)
100 Hendri - 22197
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Standar Kalibrasi
Suatu tindakan yang dilakukan, pada kondisi tertentu, yang menghasilkan hubungan antara harga hasil pengukuran dengan harga acuan standar.
Standar Primer (Primary Standard).
traceable
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Standar kalibrasi yang didisain dan dibuat berdasarkan standar primer. Dibuat oleh institusi kalibrasi.
Standar Kerja (Working Standard).
Hasil pengukuran dari suatu alat ukur sesuai dengan akurasi dan jangkauan disain awalnya pada kondisi lingkungan tertentu.
Suatu unit yang sangat akurat. Disertifikasi oleh institusi standar seperti NIST (National Institute of Standard and Technology).
Standar Sekunder (Secondary Standard).
Tujuan:
= Besaran yang diukur = Hasil pengukuran
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Akurasi (% dari span)
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Definisi:
Span shift
Pedada, 20 May 2007
Kalibrasi
Hasil pengukuran ketika harga besaran yang diukur dinaikkan dan kemudian diturunkan. Umumnya hasil pembacaannya berbeda.
Harga rata-rata pembacaan
100
0
Hasil pembacaan (% dari span)
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Akurasi satu tingkat dibawah standar sekunder. Umumnya dimiliki oleh industri dan laboratorium.
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Unit of mass (kilogram) Prototipe internasional. Dibuat dari platinumiridium, disimpan di BIPM pada kondisi tertentu. (foto milik BIPM).
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Kalibrasi Ulang
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Contoh Alat Kalibrasi Tekanan
Alat telah ditala ulang. Alat telah diperbaiki. Alat telah dimodifikasi. Faktor usia Å dilakukan secara periodik.
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Manometer-U
Dead Weight Tester
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Hand Pump
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Chandler Dead Weight Tester 58-150H-T-1
Jangkauan Akurasi Temperature operasi Kelambaban relatif Komponen utama 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
: : : : :
100 - 20,000 psi, beban terkecil: 1 psi. 0,05% dari pembacaan. o 4 – 48 C. 0 – 90%.
Pressure Gauge
Koneksi gauge. Pompa. Piston & silinder. Meja beban. Beban. Pipa (plumbing). Reservoir oli. Aksesoris motor listrik. Suction valve. Discharge valve. Meja tester.
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Pressure Gauge
Komponen utama
Alat ukur tekanan dengan indikasi lokal. Tipe:
Direct Reading.
Receiver.
Contoh: Aschroft Duragauge 1279.
Tekanan absolut, gauge, vacuum, compound, differensial. Misal, 3 – 15 psig, 0 – 40 psig.
Pedada, 20 May 2007
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Solid front. Case
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Hendri, ST, MT
Pressure relieve disc.
Full blow-out back.
Range
Tekanan operasi normal proses berada pada 25% s/d 75% dari skala. Jika skala terlalu kecil:
Case
Solid front
Relief disc
Tutup belakang
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Umur elemen elastis lebih pendek Rentan terhadap adanya tekanan lebih (overpressure)
Jika skala terlalu besar:
Case
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Proteksi Tekanan Berlebih (Over Pressure)
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Pedada, 20 May 2007
Pembacaan dengan resolusi tinggi sukar dilakukan.
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Akurasi
Material
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Elemen ukur harus tahan korosi dengan media proses.
Perbedaan antara harga acuan dengan hasil pengukuran.
Tingkatan akurasi (% dari span) (sumber: ASME B40.1):
Tabel kompatibilitas media vs. material
Termasuk hysteresis dan repeatability errors pada kondisi lingkungan tertentu (ASME B40.1). Grade 4A : 0,1%. Grade 3A : 0,25%. Grade 2A : 0,5%. Grade 1A : 1%. Grade A : 2-1-2%. Grade B : 3-2-3%. Grade C : 4-3-4%. Grade D : 5%.
Tingkat akurasi ditentukan oleh kebutuhan.
(Sumber: Ashcroft®)
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Hendri, ST, MT
Koneksi
Rating:-50 – 350 F. Dapat tergores. Silau. Tahan bahan kimia.
Lokasi: belakang, bawah dari gauge Ukuran: umumnya 1/4” dan 1/2” NPT male. Ukuran Dial
Rating: -50 – 350 F. Tidak mudah tergores. Anti silau. Tahan bahan kimia.
Laminated Safety Glass.
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Non-glare glass.
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Hendri, ST, MT
Kaca (glass).
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Window
Pedada, 20 May 2007
Rating: -50 – 200 F. Menahan serpihan pecahan kaca.
Ukuran Koneksi
≥ 4 ½”
1/2”
1 ½” < Dial < 4 ½”
1/4”
≤ 1 ½”
1/8”
Acrylic (Plexiglass).
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Rating: -50 – 180 F. Cukup tahan bahan kimia. 31 of 45
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Stem
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Mounting
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Snubber & Pulsation Dampener
Flush/panel
Surface/wall
Meredam tekanan pulsa dan impuls.
Snubber
Orifice berdiameter kecil mengurangi kecepatan aliran fluida ke instrumen.
Pulsation Dampener
Piston-Stop
Plunger berosilasi bebas di dalam lubang silinder. Body & Cylinder Assembly
Jika temperatur media sangat tinggi/rendah, gunakan pipa kapiler (> 5 ft) Æ remote mounting.
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Liquid-filled Gauge
Berisi cairan
Temperatur tinggi proses. Temperature dingin lingkungan Å media membeku & menyumbat koneksi gauge ke proses (clogging). Media korosif.
Ruang antara gauge dan diaphragm seal diisi cairan (misal: glycerin, silicone, halocarbon) Æ akurasi berkurang.
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Melindungi gauge dari:
Pedada, 20 May 2007
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Diaphragm Seal
Dengan peredam
Piston
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Tanpa peredam
orifice
Meredam pulsa tekanan dan vibrasi.
Gauge diisi cairan:
Upper ring
Top housing
Glycerin (20 – 250°F). Bereaksi dengan oxidizing agent seperti Chlorine, Asam nitrat, hidrogen peroksida Silicone (-40 – 250°F) Halocarbon (-50 – 250°F)
Karena di-seal Æ kontaminan tidak dapat masuk ke dalam gauge.
Diaphragm Lower housing
Upper ring
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Ashcroft Pressure Gauge with Plus! Performance
Instalasi Pressure Gauge
Tipe dry gauge namun mempunyai kemampuan yang sama dengan liquid-filled gauge dalam meredam pulsa tekanan dan vibrasi. Kalibrasi mudah dilakukan, tidak ada resiko kebocoran isi gauge, relatif lebih murah daripada liquid-filled gauge.
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
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Pedada, 20 May 2007
Pedada, 20 May 2007
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area Hendri, ST, MT
Jika akurasi gauge tidak dapat diperiksa dilapangan, lihat pembacaan gauge, misal tidak sama dengan 0 psig sedangkan proses berhenti. Pointer yang bengkok atau lepas karena pulsa tekanan. Window/glass yang rusak/pecah. Kebocoran isi liquid-filled gauge. Kerusakan/keretakan pada casing. Kebocoran media pada gauge & koneksinya. Perubahan warna pada isi liquid-filled gauge yang menyulitkan pembacaan. 39 of 45
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Drain/Vent Valve 1.
2.
Ketika shut-off valve ditutup, tekanan sisa pada gauge dibuang melalui drain/vent valve. Kalibrasi gauge dilapangan.
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Bersifat subyektif, tergantung pada seberapa kritis akurasi yang diperlukan. Misal, pemeriksaan bulanan untuk aplikasi kritis. Enam bulan/tahunan untuk aplikasi non kritis.
Shut-off Valve
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Pemeriksaan lapangan.
Gunakan shut-off valve antara gauge dan proses agar gauge dapat diisolasi untuk penggantian/ perawatan tanpa menghentikan proses.
© Copyright 2007.
Frekuensi pemeriksaan.
Jangan pasang gauge dengan memutar casing-nya. Gunakan kunci pas atau kunci inggris untuk memutar socket tube. Gunakan teflon tape sebagai seal pada ulir socket. Pasang dengan erat untuk menjamin tidak ada kebocoran media.
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Pengoperasian Pressure Gauge (1)
Socket tube
Isolasi proses.
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AMSE B40.1 tidak merekomendasikan penggunaan gauge dari satu aplikasi ke aplikasi lain.
Pemasangan.
Pedada, 20 May 2007
Pasang di tempat yang jauh dari getaran, temperatur yang ekstrim, embun.
Penggunaan kembali.
Case
Lokasi.
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Pengoperasian Pressure Gauge (2)
Pemeriksaan akurasi.
Kalibrasi Ulang.
Dilakukan secara berkala. Tergantung pada seberapa kritis akurasi yang dibutuhkan. Faktor usaha & waktu yang dibutuhkan juga menjadi pertimbangan.
Suku Cadang.
Pedada, 20 May 2007
Rekomendasi umum: 10 gauge terpasang, 1 spare.
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
© Copyright 2007.
Hendri, ST, MT
Hendri, ST, MT
Perawatan Pressure Gauge
Penggantian Pressure Gauge
Ganti kaca yang rusak. Hindari bearing dan roda gigi dari kotoran. Jangan beri oli pelumas pada movement dan link kecuali dengan high grade oil. Secara berkala, ganti oli pelumas pada rotary movement dan link.
Span shift > 10%.
Zero shift > 25%.
Pedada, 20 May 2007
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
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Dinding bourdon tube menipis karena korosi. Over pressure pada bourdon tube sehingga terjadi perubahan fisik permanen.
Gauge dengan akumulasi > 1 juta siklus dengan beda tekanan yang besar. Terdapat tanda-tanda korosi dan/atau kebocoran pada komponen gauge. Error yang terlalu besar dan/atau movement dan link telah aus. Kerusakan pada soket, terutama kerusakan ulir. Kebocoran isi liquid-filled gauge.
Pedada, 20 May 2007
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
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Hendri, ST, MT
Pemeriksaan fisik. Pemeriksaan zero shift & span shift. Test awal. Kalibrasi menyeluruh.
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Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007.
Titik Uji
Pemeriksaan & Kalibrasi Pressure Gauge 1. 2. 3. 4.
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
Umumnya diuji pada sembilan (9) titik (5 naik dan 4 turun):
0%, 25%, 50%, 75% dan 100% dari span. Calibration Chart
Error (% of Full Scale)
1 0.8 0.6 0.4 0.2 0 -0.2 inc – as found decr – as found incr – as left decr – as left
-0.4 -0.6 -0.8 -1 0
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Pedada, 20 May 2007
20
40
% of Range
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60
80
100
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BOB PT. Bumi Siak Pusako – Pertamina Hulu Maintenance and PG&T Department – Instrument Pedada Area
Pressure Gauge: Selection, Installation, Operation, Maintenance & Calibration Course No.: MTC-PDD-INST-TR-001
© Copyright 2007. Hendri, ST, MT
TERIMA KASIH
Pedada, 20 May 2007
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