Patent ID: 8591663

Claim:
A method for removing corrosion products from a system, the method comprising: adjusting the system temperature to between 115° F. to 212° F.; injecting a cleaning dissolution solvent including oxalic acid into the system; injecting a gas into the system after the system is filled with the cleaning dissolution solvent, the gas mixing with the solvent in the system; draining the solvent from the system after a predetermined period of time of dissolution; injecting a passivation composition including oxalic acid into the system; injecting a gas into the system, the gas mixing the passivation composition, the oxalic acid in the passivation composition converting ferrous oxalate resulting from the cleaning dissolution solvent into ferric oxalate; draining the system of the composition after a predetermined period of time of passivation; rinsing the system with a low volume solution after draining the system of the composition; and rinsing the system with a full volume solution.