Patent ID: 7666312

Claim:
A method of preventing corrosion in an industrial water system by maintaining a real-time oxidation-reduction potential, (“ORP”) at an ORP set point, wherein the system is at operating temperature and pressure, the method comprising: (a) determining the ORP set point; (b) determining the real-time ORP, wherein the real-time ORP is determined at operating temperature and pressure of the industrial water system and is based on at least one additional factor other than hydrazine concentration in said system; (e) determining concentrations of one or more active chemical species that influence the real-time ORP; (d) determining a flow rate; (e) creating a nonlinear control equation having as an input variable(s) one or more of the determined values from steps (a) to (d); and (f) calculating an output of the nonlinear control equation thereby determining an inflow of the active chemical species to the industrial water system to maintain the ORP set point.