Iraq Infrastructure Reconstruction Project

Iraq Infrastructure Reconstruction Project Protective Coatings Blast Cleaning (Shot Blasting) The entire surface area to be coated as advised by CPA is to be blast cleaned. Only dry abrasive blast cleaning techniques following the coating manufacturer’s instructions shall be used. Sand shall not be used for blast cleaning. The CONTRACTOR shall inspect all surfaces prior to application of coatings. Surface defects which are exposed by the blast cleaning operation and are detrimental to the protective coating shall be repaired; laminations shall be removed by grinding. The repaired area shall be re-blasted prior to application of coating system. Where required galvanized steel surfaces shall be sweep blasted prior to coating. Coating System Application The coating system manufacturer’s specification and data sheets shall be provided to the CPA prior to commencing works. Before application of the protective coatings all contaminants shall be removed by vacuum, airline or soft brush. In the event of any contaminants being found embedded under, or in the paint film the affected area shall be cleaned and the complete coating system re-applied. The time between blast-cleaning and application of the first coating shall not exceed four hours. Unless otherwise specified by the coating manufacturer, coatings shall not be applied under the following conditions: When the ambient temperature is below 5 Celsius. When the relative humidity is greater than 85%. When the metal surface temperature is less than 3 Celsius above the dew point. When the surface temperature is greater than 50 Celsius. During adverse weather conditions or in dust laden atmosphere; Where contamination is likely to occur. The application of the coating system shall be carried out in accordance with the coating system manufacturer’s recommendations. Any coated surface that is damaged by welding, handling or otherwise, or is roughened by rain, sand or dust, shall be spot prepared and re-touched so as to comply with this specification in both depth and quality. Areas of more extensive damage shall be cleaned back to bare metal prior to re-applying the coating. Coating Quality The surface preparation and application of the coating system shall be subject to inspection and approval by CPA The coating systems shall be stored in their original containers as per the manufacturer’s recommendations. END