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Preservation to keep Water Control Condition

The water control is extremely important for maintaining performance and an economical operation , also preventing accidents due to corrosion.

Cooling Water

  • Heat exchange is performed between the cooling water and the air in the cooling tower caucusing a mixture of components from the atmosphere such as nitrogen oxide and carbon dioxide into the cooling water, deteriorating the water quality.
    If the cooling water is continuously circulated with the blowing and/or the cooling water supply becomes insufficient due to splashing or the evaporation loss, the water quality may also deteriorate.
  • As a result, the heat exchange rate of the condenser decreases due to adverse conditions inside the tube including slime fouling, formation of sediment, corrosion tendency resulting from acidified condition and scale adhesion, which may increase power consumption and condenser pressure, resulting in problems as system failure and tube corrosion.
  • For prevention of such problems, follow the instruction manual for water quality control including when to start the operation.
  • Periodical cleaning of the tube is mandatory
  • Multiyear maintenance extended course and annual maintenance course include tube cleaning. Other courses are available as an option.
  • Removing the scales requires chemical cleaning. This service is also available as an option.
  • To know the conditions inside the tube appropriately, Eddy Current Test (ECT) is highly recommend. This test will also be available as an option.

Chilled Water

  • The chilled water is circulated in the sealed system, and does not get contact with the atmosphere as the cooling water, making the quality of the chilled water less deteriorated.
    From the preventive maintenance perspective ECT in every 5 to 7 years is strongly recommended. This test will also be available as an option.
  • When the chilled water systems are equipped with thermal storage tanks, carbon dioxide or oxygen could enter into the water due to contact with the atmosphere, making the system corrosion-prone.
    In this case, please analyze the water quality as with the cooling water, and conduct water control in accordance with the instruction manual based on the result of the analysis.

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