Specific and cation conductivity (now often designated as conductivity after cation exchange ) are common, as they can provide a general indication of impurity ingress, with CACE helping account for the influence of ammonia or neutralizing amines used to adjust pH. Several on-line measurements are potentially suitable for monitoring condensate return, depending on the nature of the contaminants. Given the multiple processes and products at chemical plants, refineries, petrochemical plants, and others, a variety of impurities from leaking heat exchangers or reaction vessels may be present in condensate return. It is common for streams from various sub-systems within a plant to be combined and then introduced to the deaerator with fresh makeup. The focus here is on the condensate return sample points, designated as #4 in the diagram. Many industrial facilities have extensive feedwater, steam, and condensate return systems whose primary material of construction is carbon steel (see Fig. Common Causes of Corrosion in Industrial Steam/Condensate Return Networks For high-pressure steam generators that produce power and have high-purity makeup and feedwater, iron monitoring is valuable for evaluating a specific phenomenon: flow-accelerated corrosion.
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