Patent ID: 6740168
Filing Date: 2004-05-25
Classification: C02F,C23F,C23G,F28G,G21F

Abstract:
A method of conditioning and removing scale and deposits within a heat exchange system that utilizes at least one heat transfer liquid comprising, in sequence, the steps of:taking the heat exchange system out of service; removing at least a portion of the heat transfer liquid from the heat exchange system; introducing an aqueous cleaning solution of a scale conditioning agent into the heat exchange system, the scale conditioning agent being present in the aqueous cleaning solution at a treatment concentration and comprising a chelant, a reducing agent, a pH control agent, and a non-ionic surfactant; circulating the aqueous cleaning solution throughout the heat exchange system and, while circulating the aqueous cleaning solution; maintaining the aqueous cleaning solution at a treatment temperature; maintaining the aqueous cleaning solution at a treatment pH; and agitating the aqueous cleaning solution as it circulates through the heat exchange system; removing substantially all of the aqueous cleaning solution from the heat exchange system; introducing replacement heat transfer liquid; and returning the heat exchange system to service.