System and method for measuring electric current in a pipeline

Abstract

A system for measuring a voltage differential in a current-carrying pipe using a propulsion vehicle for conveying the system inside the pipe, the system including a first contact for maintaining electrical contact with the pipe as the vehicle moves through the pipe; a second contact positioned in a spaced apart relationship from the first contact for maintaining electrical contact with the pipe as the vehicle moves through the pipe; and an AC voltage reading device connected to the first contact and the second contact for measuring the AC voltage between the first contact and the second contact as the vehicle moves through the pipe.

Dependencies are inferred from the claim text.