Chemical inhibitor programs, basics

In all space heating boiler systems there is a tendency to keep water treatment programs as simple as possible. Ideally, chemical inhibitors should be added in proportion to MU demands, metered water consumption, oxygen content, or other preemptive measurement. More typically, the standard process is to periodically (weekly to monthly) analyze the BW for a few basic control parameters, including measuring the multimetal corrosion inhibitor reserve, and then to merely top-up the inhibitor when the reserve is below the minimum specification. Chemical treatment often is added directly to the BW by hand-pump via a hose cock (bib cock) connection. 

During the last 60 or more years, since phosphates and other chemical inhibitors came into widespread use, the basic functional requirements of a typical water treatment program has changed little only some of the formulation additives and the chemistries involved (and some of the terminology) have changed. Today there is still a requirement for the following basic program functions ... 

Some examples of the different types of formulations and chemical programs are discussed in this section. These are basic formulations and only reveal the primary active inhibitors, rounded up to the nearest whole percentage. 

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