# US 2010/0163469 A1 · Control system for monitoring localized corrosion in an industrial water system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0163469 A1 - Document ID: US20100163469A1 - Status: Published application - Kind: A1 - Application number: 12/344,324 - Filed: 2008-12-26 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Inventors: Zhaoyang Wan; Gary Edwin Geiger; Glenn Alfred Johnson; Brian Walter Lasiuk - Web page: https://patentgrep.com/patent/US20100163469A1 ## CPC - G01N 17/00: Investigating resistance of materials to the weather, to corrosion, or to light - G05D 21/02: characterised by the use of electric means - C02F 2103/023: {Water in cooling circuits} - C02F 2209/005: Processes using a programmable logic controller [PLC] - C02F 2209/06: pH - C02F 2303/08: Corrosion inhibition - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract A control system is disclosed for monitoring and controlling localized corrosion in an industrial water system, comprising: measuring quantitative localized corrosion rate and at least one controllable water chemistry variable; identifying mathematical correlations between the quantitative localized corrosion rate and the at least one controllable water chemistry variable; establishing mathematical correlations between the controllable water chemistry variable and at least one chemical treatment feed; defining an index derived from current and future values of the localized corrosion rate and an index derived from current and future values of the at least one chemical treatment feed; utilizing a processor to minimize the index of the localized corrosion rate and the index of the at least one chemical treatment feed and determine current and future values of the at least one chemical treatment feed; and implementing only a current value of the at least one chemical treatment feed within the water system. ## Claims ### Claim 1 A control system for monitoring and controlling localized corrosion in an industrial water system comprising: a) measuring quantitative localized corrosion rate and at least one controllable water chemistry variable; b) identifying mathematical correlations between the quantitative localized corrosion rate and the at least one controllable water chemistry variable; c) establishing mathematical correlations between the at least one controllable water chemistry variable and at least one chemical treatment feed; d) defining an index derived from current and future values of the localized corrosion rate and an index derived from current and future values of the at least one chemical treatment feed; e) at each sampling time, utilizing a processor to minimize the index of the localized corrosion rate and the index of the at least one chemical treatment feed and determining current and future values of the at least one chemical treatment feed; and f) at each sampling time, implementing current value of the at least one chemical treatment feed within the water system. ### Claim 2 (depends on 1) The control system of claim 1 wherein the industrial water system is a recirculating system. ### Claim 3 (depends on 2) The control system of claim 2 wherein the industrial water system is a cooling tower system or a boiler system. ### Claim 4 (depends on 1) The control system of claim 1 wherein the localized corrosion rate is measured by a multi-electrode array (MEA) pitting corrosion sensor. ### Claim 5 (depends on 1) The control system of claim 1 wherein the at least one controllable water chemistry variable is comprised of pH, cycle of concentration, concentration of calcium, magnesium, inorganic phosphoric acids, phosphonic acid salt, organic phosphoric acid esters, polyvalent metal salts, copper corrosion inhibitor, phosphinosucciniate oligomers, water soluble polymers, and combinations thereof ### Claim 6 (depends on 5) The control system of claim 5 wherein the copper corrosion inhibitor comprises non-halogenated, substituted benzotriazoles selected from the group consisting of: 5,6-dimethyl-benzotriazole; 5,6-diphenylbenzotriazole; 5-benzoyl-benzotriazole; 5-benzyl-benzotriazole and 5-phenyl-benzotriazole. ### Claim 7 (depends on 5) The control system of claim 5 wherein the water soluble polymer is an acrylic acid copolymer formed by polymerization of acrylic acid with allyloxy monomers. ### Claim 8 (depends on 1) The control system of claim 1 wherein the at least one chemical treatment feed is comprised of acid, caustic, corrosion inhibitor, deposition inhibitor, biocide, and combinations thereof. ### Claim 9 (depends on 1) The control system of claim 1 wherein the mathematical correlation is lookup tables which specify ranges of the at least one controllable water chemistry variable and their percentage of corrosion inhibition neutral and alkaline pH water treatment programs. ### Claim 10 (depends on 9) The control system of claim 9 wherein the mathematical correlation is steady state statistic correlations between quantitative localized corrosion rate and the at least one controllable water chemistry variable. ### Claim 11 (depends on 9) The control system of claim 9 wherein the mathematical correlation is dynamic statistic correlations between quantitative localized corrosion rate and the at least one controllable water chemistry variable over the time. ### Claim 12 (depends on 1) The control system of claim 1 wherein the mathematical correlation is generated from data by using least square method. ### Claim 13 (depends on 1) The control system of claim 1 wherein the mathematical correlation is generated from data by artificial neural network (ANN) and/or fuzzy logic methods. ### Claim 14 (depends on 1) The control system of claim 1 wherein the mathematical correlations are defined and stored in a processor. ### Claim 15 (depends on 1) The control system of claim 1 wherein the indexes are defined and stored in a processor. ### Claim 16 (depends on 1) The control system of claim 1 wherein the minimization is performed in a processor.