Introduction Composite repairs are gaining popularity and acceptance worldwide among asset owners and operators. Composite repair methods and procedure are guided international engineering standards and provide an engineered, proven and durable solution to non-metallic pipe repair works. Components of composite repair materials generally comprise of filler rebuilding material, resin component and reinforcement layered sheet. Filler…
Introduction In corrosion prevention by anti-corrosion coatings, three main principles are employed in various combinations: Create a barrier that keeps out charged ions and retards the penetration of water and oxygen. Ensure contact between the steel and a less noble metal (e.g. zinc in the coating) provides cathodic protection of the steel utilizing the galvanic…
Introduction This chapter covers the major types of coatings that are currently available for use and includes general information on the composition of coatings. It is intended to give basic information on coatings and is not a comprehensive guide to anti-corrosion coatings selection. The coating manufacturer is to be consulted if information on a specific…
Introduction Good surface preparation may be considered to be the most important part of the entire coating process in that the greatest percentage of coating failures can be traced directly to poor surface preparation. All paint or anti-corrosion coating systems will fail prematurely unless the surface has been properly prepared to receive the coating. If…
Introduction Experience has shown that edges and welds are generally the first areas to show corrosion and coating breakdown, particularly in ballast and cargo tanks. This is due to a number of inter-related processes including surface preparation, coating application, deflection, and shear and buckling stresses on the edges and welds and so on. The quality…
Introduction Any individual required to carry out inspections is to be qualified to NACE Coating Inspector Level 2or an equivalent qualification. The appointed coating inspector shall carry out inspections and record the results of the inspection at the various stages and verify that these are in compliance with the standards. All deficiencies/ non-compliances found at…
Introduction The objective in applying anti-corrosion coatings is to provide a film which will give protection and/or decoration to the structure being applied. The variables which govern the success of any application and subsequent performance are: Surface preparation Film thickness of the paint system Methods of application Conditions during application Surface Preparation As detailed in…
Introduction Anti-corrosion coatings do not last forever. They age, weaken and deteriorate and eventually their useful life ends. The most common cause for premature anti-corrosion coating failure is insufficient care during the mixing, application and curing processes. Poor application technique can typically cause problems such as improper thickness, pinholes, sags, mud-cracking, and holidays. Inadequate surface…
Introduction There are a number of factors which must be considered when anti-corrosion coatings are applied. The major ones include: Condition of the substrate Temperature Relative humidity Weather conditions Condensation Ventilation Ultraviolet light (UV) 1. Condition of the Substrate The surface must be clean and free from dirt, dust, abrasive blast medium (if used), oil,…