AWWA C213-01 pdf download.FUSION-BONDED EPOXY COATING FORTHE INTERIOR AND EXTERIOROF STEEL WATER PIPEL INES
4.4.1 General. When both an internal and an external coating are to be applied, it is preferable to preheat the pipe to the specified temperature and apply the internal coating first, immediately followed by the external coating. Because elevated temperatures are required during processing, a fusion-bonded epoxy coating must be applied prior to the application of other coatings or linings unless those coatings and linings are resistant to the processing heat. 4.4.2 Surface preparation.
4.4.2.1 Surface condition. Surfaces to be coated shall be free from mud, mill lacquer, wax, coal tar, asphalt, oil, grease, chlorides, or any other deleterious material. Prior to blast cleaning, surfaces shall be inspected and, if required, precleaned according to SSPC SP1 to remove oil, grease, and loosely adhering deposits. Visible oil and grease spots shall be removed by solvent wiping. Only solvents that meet prevailing codes and that do not leave a residue shall be used. Heating to remove water and ice may be used provided the pipe section, fitting, or special is preheated in a uniform manner to avoid distortion. If chlorides or other inorganic contaminants are present after blast cleaning, removal by chemical pretreatment, water flushing, or other acceptable methods may be required.
4.4.2.2 Blast cleaning. The pipe surfaces to be coated shall be blast-cleaned to achieve a near-white surface conforming to SSPC-SP10/NACE No. 2. SSPC VIS 1-89-05 contains a series of photographs of surface cleanliness.
4.4.2.3 Visual comparative standards. Before blast cleaning is started, the applicator shall prepare a representative area of the blast-cleaned surfaces on the actual work surface as well as visual standards on panels that are a minimum of 6in.x 6in.x 0.25 in. (152 mm x 152 mm x 6.4 mm). On agreement between the purchaser and applicator that the visual standard meets the requirements of Sec.4.4.2.2, the panels shall be wrapped in 4-mil to 6-mil (102-μm to 152-μm) plastic, sealed with tape, or otherwise protected from surface contamination and corrosion, and maintained as a visual reference standard throughout the coating operation. Alternatively, other industry-accepted visual comparative standards, such as those provided by NACE or SSPC and agreed on by the purchaser and constructor, may be used.AWWA C213-01 pdf download.