Interspec: [#Aus/NZ std report at 25°C]
Page 16 of 17
Mobil Asia Pacific Regional
Specs
15/07/2010
Page 16
Internal Surfaces of Mild Steel Tanks - New Build
A high performance coating specification for exposure in immersed environments. The specification provided is based on
a maximum operating temperature of 50 C. Coatings for immersed conditions require special consideration and you must
contact International for detailed advice on preparation , application and cure prior to their use.
Surface Preparation & Comments
Prepare surface by high pressure water washing with non ionic detergent to remove oil, grease, salts, poorly
adherent paint and other contaminants. Use a minimum of pressure of 4000 psi. All surfaces to be painted must
be free of contamination.
All surfaces should be free of oil, grease and salt contamination before blasting. Abrasive blast clean to Sa2½
(ISO 8501-1:1988) or SSPC-SP10. If oxidation has occurred between blasting and application, the surface should
be reblasted to the specified visual standard. Surface defects revealed by the blast cleaning process, should be
ground, filled, or treated in the appropriate manner
A sharp, angular surface profile of 50-75 microns (2-3 mils) is recommended.
Stripe coats should be applied to all welds, lap joints, plate edges, corners, sharp edges, and any other areas
where spray application of the overall coating system may prove difficult resulting in low dry film thickness'
After the last coat has cured hard, the coating system dry film thickness should be measured using a suitable
non-destructive magnetic gauge to verify the average total applied system thickness and the coating system
should be free of all pinholes or other holidays. Dry film thickness under 20 mils (500 microns) can be checked
using a suitable low voltage wet sponge holiday detector.Excessive voltage may produce a holiday in the coating
film. The cured film should be essentially free of runs, sags, drips, inclusions or other defects. All deficiencies and
defects should be corrected. The repaired areas shall be retested and allowed to cure as specified before placing
the finished lining into service.
All surfaces to be coated should be clean, dry and free from contamination. Prior to paint application all surfaces
should be assessed and treated in accordance with ISO 8504:2000. Oil or grease should be removed in
accordance with SSPC-SP1 solvent cleaning.
Area Size: 1 m2
Product
#
Binder
Name
Site
Coat
OR
Type
Shop
1
Interline
850
Epoxy
Full
Phenolic Coat
Shop
2
Interline
850
Epoxy
Full
Phenolic Coat
Shop
Application
Method
Overcoating
VS WFT
DFT TSR
interval at 25C
% micron micron m2/l
Min - Max
Airless Spray,
Brush, Roller, Air 76
Spray
Airless Spray,
Brush, Roller, Air 76
Spray
Pot
Life
Thinner
at
25C
197
150
5.07
8 Hr - 30 D
1 Hr
International
GTA220
197
150
5.07
8 Hr - 30 D
1 Hr
International
GTA220
300
This specification complies with our environmental Ecotech Initiative to limit organic solvent emissions and certain
potentially harmful substances such as isocyanates. For further information on Ecotech please contact International.
file://C:\temp\PCSS\temp.htm
15/07/2010