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by on November 26, 2021

Flanges can suffer from two types of corrosion: crevice corrosion and pitting corrosion, both of which can occur over the course of their service life.

Known as Pitting Corrosion, this type of corrosion occurs on the face of a flange and is frequently found in clusters or groups. This type of corrosion results in the formation of small pits or cavities on the surface of the material under consideration. Pitting corrosion can be avoided to the greatest extent possible through the selection of the appropriate alloy for the job. The occurrence of crevices is increasing at an alarming rate. It is the buildup of concentrated substance between two adjacent flanges that is responsible for the corrosion that occurs in this instance. A consequence of this is that it is extremely difficult to inspect the areas where the corrosion is occurring, making it a particularly hazardous form of corrosion.

Detecting flange damage is most effectively accomplished by disassembling the joint and visually inspecting all of the surfaces on which the joint has been assembled. Although it is not ideal due to the downtime and costs involved, it is sometimes necessary in certain circumstances. The use of non-destructive techniques to inspect the amount of corrosion present in a ANSI Flange and fitting assembly has recently seen some advancements as a result of recent developments in this field.



Maintenance of paints is the most widely used method of preventing corrosion from taking place. The epoxy or urethane used as a base for the paints is environmentally friendly. In all likelihood, the majority of paints will bond directly to the substrate and harden to form a durable coating. In order to get the best results from maintenance paints, it's important to use the correct amount. It is possible that if the paint is applied too thinly, the area will be ineffective, and that if the paint is applied too thickly, the fasteners will become stuck together. Given the wide range of Blind Flange sizes, shapes, and angles, it is possible that you will not be able to coat the entire surface. After the pipe flange has been thoroughly inspected, it is necessary to apply another layer of coating to further protect it. Because maintenance paints do not necessitate the use of specialized equipment or hot work, they have the advantage of being more cost effective.

Rigid clamps or coverings that are encased within the flanges are typical components of mechanical solutions. Clamps and covers made of stainless steel are available in both plastic and stainless steel versions. The use of semi-solid tapes, which are a type of adhesive, is an alternative option. They can be made of viscoelastic polymers, wax, or petroleum that has been embedded into the fabric for a variety of applications, including wrapping. This application calls for semi-solid polymers because of their water-repellent properties, which make them a great choice for this application.

Topics: ansi flange
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