Corrosion issue on the inner wall of storage tanks
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Many corrosion zones are present on the inner wall of the storage tank; the tube walls are heated using steam jacketing, with a wall temperature of 230°C. The tank is a gas sedimentation tank, and the gas phase temperature ranges from 50 to 60°C. There is a significant amount of slag at the bottom of the tank. At this wall temperature, there should be no moisture on the surface; therefore, is it reasonable to conclude that the corrosion mechanism is under-scale corrosion? Additionally, scaling is present almost throughout the entire pipe wall, while corrosion is clearly localized. How can this be explained?
“A gas phase temperature of 50–60°C does not necessarily mean the gas is dry; the moisture brought in along with the material as it enters the system must be taken into consideration. It is also related to the physical and chemical properties of the material. For reference.
What is the material of the tank? Storage medium? Operating temperature? Pressure? Was any sampling and analysis of the formed scale done? All corrosion analyses are based on an analysis of the environment and the material; it is necessary to clearly describe whether, from the images, it is carbon steel or low-alloy material, and whether it involves uniform corrosion. Is the deepest part of the corrosion pits located where the temperature is highest?
“A gas phase temperature of 50–60°C does not necessarily mean the gas is dry; the moisture brought in along with the material as it enters the system must be taken into consideration. It is also related to the physical and chemical properties of the material. For reference.
Anti-corrosion paint won’t work; you can use our 711 or 811 anti-corrosion products instead
Is the wall temperature kept at 230 degrees? Actually, this is a pretty high temperature