How often is it appropriate to clean and pre-coat a circulating water system?
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How often is it reasonable to carry out cleaning and pre-coating for a circulating water system?
Cleaning the pre-coating should be a two-step process: the cleaning step and the pre-coating step. The duration of the cleaning process is determined by the point at which the calcium ions in the cleaning water stop increasing while the iron ions increase significantly; therefore, it is not estimated or determined based on time periods. While maintaining the pH value of the cleaning solution constant, measuring the ion concentration in the cleaning solution is the standard for determining whether the cleaning is complete, rather than relying on a specific time period. The pre-coating process can generally be determined by a time period, although it can also be determined by ion concentration. The general pre-coating process takes 10-24 hours.
Cleaning and pre-coating operation for circulating cooling water systems
Agree with the view on the first floor; it is determined by the iron ion content. Generally, the membrane filtration effect is poor when the system is not shut down, likely due to restricted system replacement. The poster can choose an opportunity when the system is shut down for maintenance to apply the film, as that will yield much better results.
It should be determined based on the actual conditions of the system; if it operates over a long period of time, the decision should be made according to the heat exchange efficiency of the production unit. After maintenance is completed, cleaning and film formation should be carried out
What LZ is asking is how often it is reasonable to carry out cleaning and pre-coating for the circulating water system; this refers to the system’s operation cycle. Generally, every six months or once a year is appropriate, but this should be determined based on the actual operating conditions of the system. If severe scaling or significant corrosion is detected during operation, it is necessary to carry out these tasks earlier.