Understanding Water Chemistry Differences Between Closed and Stator Cooling Water Systems
By Colleen M. Layman
Despite the primary role that closed cooling water systems and stator cooling water systems have in keeping important plant systems operational, these two plant water systems are often times overlooked and misunderstood by even the most conscientious power plant operators. That is, at least, until issues arise and plant operations are restricted or the plant is forced off-line due to limitations with these systems.
This article will provide a review of the primary chemistry programs typically used in caring for power plant CCW and stator cooling water systems. Two case studies will be discussed where power plants developed challenges with the chemistry and operation of their systems. The troubleshooting process and root cause investigations that followed will be discussed and detailed.
Power plant operators spend a fair amount of time worrying about circulating water chemistries and steam-water cycle chemistries. Even the treatment of plant wastewaters has gained increased focus in recent years as plant National Pollution Discharge Elimination System (NPDES) permits have increased the rigor with which monitoring of plant discharges must be performed.
The closed cooling water and the stator cooling water systems, however, are two power plant water systems that, despite their importance in keeping major plant equipment operational, do not receive as much attention.
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