The present invention pertains to apparatus and methods for measuring potentials between buried pipelines and the soil wherein {HEAD ~ the pipelines} are connected to a cathodic protection system and are disposed in {TAIL ~ urban areas}, in particular 
are disposed in
The present invention pertains to apparatus and methods for measuring potentials between buried pipelines and the soil wherein { HEAD ~ the pipelines } are connected to a cathodic protection system and are disposed in { TAIL ~ urban areas } , in particular
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH