Among various methods used to reduce stray currents and electrolytic corrosion in underground pipe and cable systems, the interruption of metallic continuity of components by so-called insulating couplings frequently is applied.1-7
Many engineers now prefer to protect underground pipe lines by cathodic polarization. It would be a mistake, however, to assume that utilization of this method makes the use of insulating joints unnecessary. It often is necessary1 to isolate electrically sections of pipe or cable from connecting metallic structures in order to use cathodic protection effectively and economically. The simplest method to achieve this isolation is by installation of insulating joints.
Results of a great number of cathodic polarization studies are not only of theoretical importance but also useful to the practical engineer and designer. On the other hand there is nearly a complete lack of electrochemical investigation of insulating couplings.
The following studies were made to obtain...
