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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