Three dimensional mapping of corrosion pits in cast iron pipe using the remote field effect
: The remote field effect is an electromagnetic method for inspecting pipes and tubing. It has recently been commercialised as a technique for inspecting gray cast iron and ductile iron water mains. How-ever, commercial tools provide information on pits depths in the pipe and overall wall loss. Models of the mechanical behaviour of cast iron pipe also require information on pit width and length. This paper discusses remote field effect apparatus and experimental techniques used in the laboratory to produce three dimensional electromagnetic field maps. The maps shown in the paper indicate that sizing corrosion pits in three dimensions is possible using the remote field effect. Further research needs are also discussed.
The phantom exciter: high resolution measurements of RFEC slit defect interactions
In order to obtain a better understanding of defect interactions associated with the Remote Field Eddy Current technique, a new exciter/detector geometry has been used. The Phantom Exciter geometry uses a single through-wall transmission and allows high resolution measurements to be made in the region of a defect. Strong response to axial slits in nonferrous pipes due to eddy current interaction has been demonstrated. Magnetic interactions in ferrous pipe has lead to good responses to circumferential slits
Control of Pipeline Corrosion
This book presents practices, techniques, materials, and equipment used for basic corrosion and cathodic protection of pipelines. Written by an electrical engineer and a leading authority on control of pipeline corrosion in the United States and overseas. Presents formulas, practices, and recommendations based on study of large and small pipeline systems. Includes survey methods and techniques, groundbed design, instrumentation, construction practices, maintenance procedures, and economics. Evaluates cathodic protection with rectifiers, galvanic anodes, and other current sources.