抄録
Cathodic protection is being applied to buried heat supply pipelines in district heating and cooling systems. However, there is possibility of corrosion due to the inner jumping current occurring at insulating joints.
In this study, a corrosion protection method which makes the bare pipe behave as if it were coated on its inner surface with resin or a resin tube was developed and evaluated. This method utilizes the behavior that the passivity of corrosion-resistant material restrains the outflow of current from its surface. As a result of various experiments, it has been found to be most effective to use a pipe made of titanium with insulating joints at both ends for reducing the inner-jumping current.
This corrosion protection method has already been adopted at worksites and confirmed in its effect.
