Nitrite is an oxdidising ...

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Nitrite is an oxdidising anodic inhibitor. Nitrite forms Y – Fe2O3 passive film by following reaction, 4Fe + 3NO2 + 3H+ ----- >2 YFe2O3 + NH3 + N2, Ddose 700 – 1800 MG / LIT as NaNO2. Depending on presence of aggressive ions like SO4—and Cl-.Under dosing of nitrite can cause severe pitting. Nitrite promote microbiological growth in chilled loop so you need protection by biocide.