Download - Offshore structures surface treatment
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HEMPEL ACADEMY
Off-shore structures
Surface treatment
SPJ/HO – Revision 0 / Jan-2010
Søren Pii JohannessenHempel Academy - Paint Technology & Inspection
Manager
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Off-shore structuresTypical structures
FPSO, FLNG
Rigs
Wind-mills
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Off-shore structuresSurface treatment
Surface preparation of steel
Application of protective system
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Off-shore structuresRequirements
Long lifetime
• Structural
• Protective system
25 to 50 years
15 to 25 years
- In extreme aggressive environment
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Off-shore structuresRequirements - Specification
Protective system
Surface preparation
Application
Inspection
Dry film thickness
Steelwork, cleanliness, roughness
Dry film thickness, intervals
Control, reporting
- Each to be documented / certified
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Off-shore structuresRequirements - Standards
NORSOK
ISO 12944
ISO 20340
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Off-shore structuresUnder-water areas
Cleanliness
Roughness
Paint system
Sa 2½, max. 20 mg/sqm soluble salts
Medium (G), BN 10b
Epoxy: 2 x 400 micron
(+ cathodic protection)Fouling protection ?
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Off-shore structuresAtmospheric exposed areas - 1
Cleanliness
Roughness
Paint system
Sa 2½, max. 20 mg/sqm soluble salts
Medium (G), BN 10b
Zinc-(epoxy/silicate): 1 x 60 micron
Epoxy : 2 x 125 micronPolyurethane : 1 x 50 micron
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Off-shore structuresAtmospheric exposed areas - 2
Cleanliness
Roughness
System
Sa 3, max. 20 mg/sqm soluble salts
Coarse(G), BN 11b
Zinc-(metallizing) : 1 x 60 micron
Epoxy : 2 x 100 micronPolyurethane : 1 x 50 micron
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Off-shore structuresVarious tanks
Cleanliness
Roughness
System
Sa 2½, max. 20 mg/sqm soluble salts
Medium(G), BN 10b
Epoxy phenolic : 3 x 100 micron
Epoxy phenolic : 2 x 150 micron
or
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End