2006 Volume 71 Issue 599 Pages 111-118
The water leakages due to corrosion occurred from the dry sprinkler piping and the wet sprinkler piping which both are galvanized steel pipes after 1.5 year and one years of use respectively. The cause of corrosion was investigated by the electrochemical analysis of the cut sample pipes and the reproduction experiments. It was clarified that the cause of corrosion depended on the reversal phenomenon of electrical potential between the zinc and the steel, and the high density of dissolved oxygen caused by high pressure in piping. For preventing corrosion, the water in dry sprinkler piping should be pulling out and the airs in dry and wet sprinkler piping should be substituted for nitrogen.
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