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Corrosion caused by oxygen in boilers usually shows up as pits. Often the pits are covered by raised mounds of iron oxide. Sometimes the corrosion appears to be superficial; however, this type of corrosion can penetrate the tube wall and lead to failure. The potential for oxygen pitting can be minimized by the addition of chemical oxygen scavengers and the use of mechanical deaeration. Because most cases of oxygen pitting take place when boilers are shut down, it is important to pay careful attention to idle and stored boilers to ensure that damage does not occur. Your Pureline representative can provide you with a storage procedure suitable for your boiler system.