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Industrial Blasting & Painting



sand-blasting sand-blasting sand-blasting sand-blasting

Surface Preparation consists of primary surface preparation and secondary surface preparation. The primary surface preparation aims to remove mill scale, rust, corrosion products, and foreign matter from a steel surface prior to application of a shop primer or primer.

Blast Cleaning is based on the principle of an abrasive jet of particles in a compressed air stream impinging on the surface, removing impurities, millscale, rust and old paint. Abrasive blast cleaning is the most thorough and widely used method of surface preparation in the shipbuilding and repair industry. Different degrees of surface cleanliness are possible and depend in part on the surface condition prior to treatment and also to the length of time for which the surface is exposed to the abrasive jet. In addition to cleaning the surface, the abrasive particles will impart a surface roughness to the steel.

Spot Blasting is localised abrasive cleaning often carried out in ship repair, especially on the outside hull, where patchy corrosion or damage has occurred. It can be used to yield surfaces that are cleaned to Sa 2 or better but often surrounding intact areas are peppered with stray grit.

Water Jetting or Hydro Blasting as a surface preparation technique is being used more and more in shipyards. A major advantage of using water pressure as an abrasive is the lower impact on environment and health because less dust is generated than is the case with grit blasting. It also constitutes less of a safety risk caused by sparks and reduces the amount of salt remaining on the surface. As with blast cleaning, prior to hydro blasting, water insoluble foreign matter such as oil and grease must be removed.

Sweep Blasting is the treatment of a surface by quickly passing a jet of abrasive across the surface. It is typically used as a tool to get some surface roughness on an existing, firm adhering coating in order to facilitate inter coat adhesion. The level of effectiveness depends on the skill of the operator, the type of surface and particle size of abrasive. In general, a fine grade of abrasive (0,2-0,5 mm) is recommended as larger particle sizes would destroy the existing coating too much.

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V. Desai Colors Pvt. Ltd., Vadodara,Gujarat,India