corrosion under insulation: a review
TRANSCRIPT
![Page 1: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/1.jpg)
CORROSION UNDER INSULATION: A REVIEW
Monthly Meeting
NACE Student Chapter
Universitas Indonesia
Tuesday, 24th of May 2012
![Page 2: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/2.jpg)
Konten Presentasi
• Pendahuluan
• Definisi
• Mekanisme
• Contoh Foto
• Pengendalian
• Inspeksi
![Page 3: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/3.jpg)
Pendahuluan
![Page 4: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/4.jpg)
![Page 5: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/5.jpg)
![Page 6: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/6.jpg)
Pengertian
• CUI adalah jenis korosi yang terjadi akibat
terjebaknya air di dalam isolasi (Rockwool)
sehingga menyebabkan proses korosi
berlangsung.
• Jenis korosi ini adalah bentuk korosi yang
terlokalisasi.
• Korosi jenis ini bisa menyebabkan
kegagalan pada bagian yang tidak diawasi
secara intensif.
![Page 7: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/7.jpg)
Pengertian
• CUI ini susah untuk ditemukan karena
adanya insulasi yang menutupi, hingga
terjadi kegagalan sebelum sempat dideteksi.
• Adanya air adalah inti dari CUI ini. Perawatan
khusus harus dilakukan selama proses
design agar air tidak bisa masuk secara
langsung ataupun tidak langsung melalui
proses kalipalisasi.
![Page 8: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/8.jpg)
Beberapa gambar CUI
![Page 9: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/9.jpg)
Mekanisme
![Page 10: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/10.jpg)
![Page 11: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/11.jpg)
PREVENTING CUI
![Page 12: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/12.jpg)
Insulation Selection
Maintenance Practices
Weather Barriers
Protective Paints and Coatings
Equipment Design
![Page 13: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/13.jpg)
Insulation Selection
• Such as calcium silicate, glass fiber and, to
some extent, cellular plastic foams absorb
and retain liquids and vapors.
• The only fully nonabsorbent insulation is
cellular glass. Cellular glass should be
used where corrosive or flammable liquids
are present.
![Page 14: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/14.jpg)
Equipment Design • The proper design of insulation for
pressure vessels, tanks and piping
includes consideration of the support and
connection of the material.
![Page 15: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/15.jpg)
Protective Paints and Coatings • Coating system must protect for long periods against water or
corrosives.
• An epoxy or epoxy-phenolic should be applied in two coats
over an abrasive blast cleaned surface.
• Recoating is done every 10-15 years.
• Coating Criteria :
1. Withstand boiling water.
2. Heat and thermal shock resistance.
3. Direct application to hot steel (up to 500°F).
4. Excellent constructability when applying to ambient steel.
5. High film capability while applying to directly to hot steel.
6. Simple to use.
7. Low VOC content and environmentally safe
![Page 16: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/16.jpg)
Weather Barriers • Provides the primary barrier to water.
• Can be inspected quickly and repaired
economically.
• Keep liquids and evaporation of any liquid
that manages to get into the insulation
system out.
• Should be durable, offer flame-spread
resistance, and be economical.
• The material must be maintained
periodically (usually, two to five years) to
remain effective.
![Page 17: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/17.jpg)
Maintenance Practices • Routine maintenance is needed to catch
defects due to deterioration or abuse.
![Page 18: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/18.jpg)
MONITORING CUI
![Page 19: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/19.jpg)
• Profile Radiography
• Metode ini umumnya menggunakan
sumber Ir192 , penyinaran dilakukan pada
bagian kecil dari pipa dan menggunakan
blok komparator untuk menghitung
ketebalan pipa. Profile Radiography
metode evaluasi yang efektif untuk
diamater pipa ≤ 8 inci.
![Page 20: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/20.jpg)
• Kelebihan:
• 1. Memberikan informasi ketebalan tanpa
membuka insulasi
• 2. Memberikan informasi penipisan karena
korosi pada permukaan
• luar dan dalam
• Dapat dilakukan pada kondisi on-stream
•
![Page 21: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/21.jpg)
• Kelemahan:
• 1. Hanya dapat diaplikasikan pada bagian
kecil dari pipa
• 2. Mendapatkan hasil cukup lama, adanya
waktu untuk set-up dan
• proses film
• 3. Isu radiasi
![Page 22: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/22.jpg)
Image Scope (Lixi
GadScope):
![Page 23: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/23.jpg)
• Kelebihan:
• 1. Tidak perlu membuka insulasi
• 2. Tidak perlu barikade daerah kerja karena
menggunakan sumber energi yang relatif lebih rendah
•
• Kelemahan:
• 1. Hanya memberikan profil permukaan luar pipa
• 2. Memerlukan sejumlah teknik untuk mendapatkan hasil
yang
• tepat
•
![Page 24: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/24.jpg)
• Keterbatasan:
• 1. Aplikasi terbatas pada diameter ≤ 18
inci
![Page 25: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/25.jpg)
![Page 26: Corrosion Under Insulation: A Review](https://reader034.vdocuments.us/reader034/viewer/2022050702/544a77fbaf7959a8438b4922/html5/thumbnails/26.jpg)