CORROSION PREVENTING METHOD FOR STAINLESS STEEL PIPELINE FOR WATER SUPPLY AND HOT WATER SUPPLY

摘要

PROBLEM TO BE SOLVED: To prevent macrocell-corrosion of a stainless steel pipe used as a pipeline by adjusting water quality of used raw water. ;SOLUTION: In an indoor pipeline system for water supply and hot water supply in which an SUS 304 stainless steel pipe is used, Cl^- concentration of used water is periodically measured, and controlled to below 25ppm. When Cl^- concentration Y (ppm) of used water exceeds 25ppm, HCO₃^- concentration X (ppm) is adjusted, and the expressions Y≤95-24.2×log X(X800ppm), and Y≤4.6×10^0.0009X+0.9(X≥800ppm), are satisfied.;COPYRIGHT: (C)1997,JPO