DNV Columbus: We provide corrosion, materials, mechanical engineering and failure analysis services to industry. Our experience includes gas and oil pipelines, refinery equipment, chemical plants, food processing equipment, and various types of pressure vessels, piping systems, and tanks. In addtion, we have a full-service corrosion and materials testing laboratory. The photograph on the left below shows internal corrosion of a copper pipe, while the photograph right below shows our metallographic microscope. Click here to see more examples of corrosion.