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Corrosion damage in the buried wellhead equipment and surface casing immediately below the landing base is a major concern in the onshore fields. Initial schedule inspections in the past of the buried wellhead equipment reveals corrosion damage to the landing base, casing spools and surface casings. The damage were occurring in spite of an apparently successful in place cathodic protection program that has reduced the number of casing damage due to external corrosion.
A new family of low viscosity MDI-based isocyanates has been developed for use in two component compositions for primer and protective coating applications. This new family of products shows excellent adhesion to a variety of substrates including concrete surfaces and wood. The products can be effectively applied on wet surfaces and compared to earlier products, have extended pot lifetimes.
Two component spray polyurea systems are fast reacting and provide quick return-to-service coatings. Aromatic polyurea coatings have good physical properties but discolor upon exposure to UV light due to the aromatic content. Some of these aromatic systems have been coated with an aliphatic topcoat to provide the desired color stability.
Fluorourethane coatings based on FEVE, fluoroethylene vinyl ether chemistry, have been used globally for over 30 years. This technology has a proven record of outstanding performance against exposure to the elements and has been used in applications ranging from aerospace to architectural structures. Recently, the bridge market has taken notice of this high performance, especially in harsh marine environments. Resistance to degradation by UV light is important to the longevity of a bridge structure, but it could be argued that corrosion resistance is the key performance indicator for a protective topcoat.
Esab is always committed to technological innovations to support its customers in improving productivity and quality in their production units. This high focus has recently brought to the market an innovative cladding solution.It is about the Integrated Cold Electrode for SAW process, launched in 2012 for joining application only. However, taking the benefits of its high flexibility and of the continuous development around it, it is now also possible to use it for cladding applications. It delivers the required weld deposit chemistry in a single layer solution by combining different wire grades with very low dilution.Esab also has a long experience in LNG application, where a dedicated flux is well known all over the world. It has been designed some years ago to reduce crack susceptibility when NiCrMo wires are used to weld 9%Ni plates.
When protective coatings are to be applied to structures, it is important that the surface is clean and dry if premature failure of the coating is to be prevented and the full coating service life achieved. In many situations for both new build and repair of structures, blast cleaning of the surface is required to remove contamination and to create an anchor pattern to enhance the adhesion of the coating system to the substrate.
There are a wide variety of materials and techniques available for protecting metal roof decks. Each of these technologies presents specific problems and challenges. This paper will provide an overview on the use of polyurethane hybrid thick-film-coatings in direct to metal roofing applications and how the unique chemistry and physical properties of these coatings allow them to address some of the key failure issues associated with alternative roofing materials.