In closed-loop systems, it is very important to use the correct chemical in the correct amount. To achieve this, the system must be thoroughly analyzed. If a chemical is used outside its effective operating range, it can damage the system. The material of the pipes used in closed-loop systems and the composition of the water play a significant role in determining the appropriate chemical. Two types of chemical formulations are widely used in closed-loop systems: nitrite-based and molybdate-based chemicals. If the water’s pH is between 7 and 8.5, nitrite-based chemicals are recommended. If the pH is greater than 8.6 and the system contains aluminum, molybdate-based chemicals must be used, as nitrites can cause corrosion in the system. If scale or sediment has formed in the system, a bag filter must be used to remove these deposits, and appropriate chemicals must be used to prevent their reformation. If the system is fed with hard water, chemicals containing hardness-reducing inhibitors should be used.
As a company that believes in measurable and reportable work, we continuously report system health to our customers using corrosion coupons and other performance measurement techniques in all closed-loop systems. It is very difficult for the operator to detect issues in closed-loop systems until a problem arises. Once a problem occurs, there is no going back.
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