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Hydroblasting Standards

Hydroblasting Standards
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Marine Coatings Cargo Tank Coatings Recommended Working Procedures AKZO NOBEL

Introduction Successful in service performance of cargo tank coating systems depends not only on the correct choice of coating but also on the procedures adopted for surface preparation and paint application. This document is designed to assist ship operators, shipyar ds and contractors achieve the optimum preparation and application standards so maximising the performance of cargo tank coatings. Tank Condition - Pre Contract Prior to the commencement of abrasive blasting, it is essential that the tanks are clean, dry and in a condition suitable for the surface preparation and application...

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“Successful in service Heating coils should be masked during blasting and coating. performance of cargo tank coating systems depends not only on the correct choice of coating but also on the procedures adopted for surface preparation and paint application.” Steelwork Preparation In order to provide surfaces which will ensure optimum coating performance, the following minimum steelwork preparation should Surface Preparation be carried out: Two main universal standards of surface preparation are normally specified for cargo tank coatings – ISO Standar d ISO 8501-1 (1988) - Item Sharp Edges...

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Scaffolding (Staging) Type Cargo Lines Staging should be designed to allow thor ough cleaning and acceptable The internal areas of cargo pipe lines should be coated, if r equired, substrate access. International Paint recommend that staging should prior to fitting on the vessel. The exter nal areas of cargo pipe lines be the ‘turn over’ type, when local safety r egulations permit. Tubular should be blasted and coated at the same time as the lowermost scaffolding should not mask surfaces to be coated. Wher e contact with 2 metres (6.5 feet) of the tank. surfaces is necessary, spade ends...

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When preparing surfaces by other means, all traces of debris should also be removed by appropriate methods. Before application of the coating, the amount of r esidual salt on the prepared steel surface should be measured by the Bresle patch method (ISO 8502-6: 1995) or similar. If the salt contamination level is “For optimum performance of cargo tank coatings, close control of dry film thickness above the maximum that is permissible for the particular pr oduct being used,† further fresh water washing, blasting and cleaning will be required. is essential.” Coatings Application All products...

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Stripe Coats Stripe coating is an essential part of good painting practice in cargo Key areas for stripe coat application. tanks. Typical areas where stripe coats should be applied include: • backs of stiffeners • cut outs i.e. scallops, etc • welds • areas of difficult access (corners etc) • ladders and hand rails • areas of properly prepared pitting In general, stripe coats should be applied by brush or r oller depending on the items concer ned. In exceptional circumstances it may be acceptable to apply a stripe coat to the backs of stif feners by narrow-angle airless spray. The use of...

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Repairs These procedures are recommended for the repair of damages either at the initial coating stage or during cargo tank maintenance. The procedure recommended will depend upon the type and extent of r epair involved. Major Repairs Inspection of cargo tank following full coating refurbishment. Where major repairs are required, work should be carried out in accor dance with all the previous sections of these working procedures. Minor Repairs These are repairs to areas damaged, either at the initial coating stage, (e.g. by destaging) or during the in service period (e.g. cargo-induced...

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November 2004 International Paint Ltd is part of Akzo Nobel, the Netherlands based company serving customers thr oughout the world with healthcare products, coatings and chemicals. Consolidated sales for 2003 totalled EUR 13 billion. Akzo Nobel currently employs approximately 64,300 people in more than 80 countries. Argentina Australia Bahrain Belgium Brazil Bulgaria Canada Chile Colombia Croatia Cuba Cyprus Denmark Ecuador Egypt Estonia Fiji Finland France Germany Greece Hong Kong Iceland India Indonesia Iran Italy Japan Kuwait Latvia Lithuania Luxembourg Malaysia Malta Mexico Netherlands...

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