Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Rapid Communication Note
Corrosion Inhibition Performance for Copper Tubes of Heat Source Machines by Oxygen Reducing Treatment Using Sealing Materials for a Water Surface in an Open Heat Storage Water System, based on Analyzing Eddy-current Inspection Results
Akihide HiranoHiroyuki Nakamichi
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2016 Volume 65 Issue 12 Pages 515-519


To clarify the corrosion inhibition performance of oxygen reducing treatment for copper tubes of air-conditioning heat source machines at an open heat storage water system, reports on eddy-current inspection for copper tubes of the heat source machines and dissolved oxygen (DO) concentrations of chilled water and hot water during the operation were re-analyzed. When a copper tube was damaged more than 5% of its original thickness, it was defined as the damaged copper tube and the ratio of the number of damaged copper tubes against the number of eddy current inspected copper tubes was calculated as the damage rate. It was found that the damage rate of copper tubes of the heat source machine was decreased by reducing DO concentrations, and it could be obtained less than 1% when DO concentration is controlled less than 1mg/L.

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© 2016 Japan Society of Corrosion Engineering
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