Hydroblasting Standards www.international-marine.com

Hydroblasting Standards Contents 1. 2. 3. 4. Introduction Format Explanatory Text Procedure For Using The Standards 5. Notes 6. References 7. Visual Standards 1 Introduction Hydroblasting is a technique for cleaning surfaces, which relies entirely on the energy of water striking a surface to achieve its cleaning effect. Abrasives are NOT used in hydroblasting systems. Consequently the problems caused by dust pollution and by the disposal of spent abrasives are eliminated. Two different hydroblasting operating pressures are commonly encountered. • High pressure hydroblasting, operating at pressures...

The definitions are: Rust Grade C: Steel surface completely covered with rust but with little or slight pitting under normal vision. Rust Grade D: Steel surface completely covered with rust on which general pitting is visible under normal vision. 3.2 Blast Standards The standard illustrates grade C and D surfaces prepared by hydroblasting to two different degrees of cleanliness. These are designated HB2 and HB21/2 and are comparable to Sa2 and Sa21/2 described in the ISO 8501-1:1988 surface preparation standard and to SSPC-SP6 and SSPC-SP10 of the Steel Structures Painting Council surface preparation...

4.3 Compare the prepared surface with the photograph selected immediately after hydroblasting but before the surface has flash rusted to evaluate the degree of cleaning, see note 5.3. 4.4 Prior to painting compare the flash rusted surface with the flash rusting photographs. For example, D HB2 L, D HB2 M, D HB2 H to evaluate the degree of flash rusting that has occurred. 4.5 Check that the paint product specified is suitable for overcoating the degree of flash rusting that has occurred. See note 5.7. 5 Notes 5.1 Definition of Terms The terms hydroblasting, hydrojetting and water jetting essentially...

5.6 Chemical Corrosion Inhibition Flash rusting can be prevented by the use of water soluble chemical corrosion inhibitors. These inhibitors may leave a crystalline layer on the steel surface as the water evaporates which can then lead to a loss of adhesion and osmotic blistering if coatings are applied over this type of surface. International Paint do not recommend the use of corrosion inhibitors to hold wet blasted surfaces. If inhibitors are used, they must be thoroughly washed off with fresh water before International Paint products are applied. 5.7 Removal of Flash Rusting When flash rusting...

7 Visual Standards Rust Grade Standards Rust grade C Rust grade D

Preparation Standard C HB2 Rust grade C C HB2 Rust grade C Hydroblasted to an Sa2 equivalent

Degree of Flash Rusting C HB2 L. Light flash rusting C HB2 M. Moderate flash rusting C HB2 H. Heavy flash rusting

Preparation Standard C HB2 1/2 Rust grade C C HB21/2 Rust grade C Hydroblasted to an Sa21/2 equivalent

Degree of Flash Rusting C HB21/2 L. Light flash rusting C HB21/2 M. Moderate flash rusting C HB21/2 H. Heavy flash rusting

Preparation Standard D HB2 Rust grade D D HB2 Rust grade D Hydroblasted to an Sa2 equivalent

Degree of Flash Rusting D HB2 L. Light flash rusting D HB2 M. Moderate flash rusting D HB2 H. Heavy flash rusting

Preparation Standard D HB2 1/2 Rust grade D D HB21/2 Rust grade D Hydroblasted to an Sa21/2 equivalent

Degree of Flash Rusting D HB21/2 L. Light flash rusting D HB21/2 M. Moderate flash rusting D HB21/2 H. Heavy flash rusting

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