Compatibility of cold applied tapes with coal tar applied on gas pipelines

In this research, compatibility of cold and hot applied tape with rusty coal tar gas pipelines was investigated by cathodic disbonding and adhesion tests in room temperature which reveals that using of cold applied tapes at weld joints and repairing region have not inherent problems, but they required to carful and correct surface preparations with using of suitable primer. Cathodic disbonding results presented better performance of cold applied tapes on weld joints by average cathodic disbonding radius of 23 millimeter, and better performance of hot applied tapes on damaged regions by average cathodic disbonding radius of 1.5 millimeter. Adhesion results like cathodic disbonding results were explanatory of better performance of cold applied tapes on weld joints by peeling speed of 2.33 mm/min and better adhesion of cold applied tapes on damaged regions by peeling speed of 1 mm/min.