INDUCTIVE DETECTION OF UNDERGROUND METALLIC PIPES

A widely used instrument for locating underground metallic pipes consists of two coils: one of which (the transmitting coil) excites eddy currents in the pipe, and the other (the receiving coil) detects the magnetic field of these eddy currents. Irregularities in the response of this type of instrument appear during certain search operations. These irregularities cause uncertainty about the position of the line of the pipe. They are explained quantitatively in this paper. The analysis shows how the reaction field of the pipe varies with the depth and diameter of the pipe, and with its electrical and magnetic properties. A theoretical estimate of the diameter of the smallest pipe that can be detected is given.

• Corporate Authors:

  Institution of Electrical Engineers

  Savoy Place
  London WC2R 0BL, NY  England  10016-5997
• Authors:
  • Glennie, E B
  • Miller, TJE
• Conference:
  • Institution of Electrical Engineers, Proceedings
• Publication Date: 1975-4

Media Info

• Pagination: p. 345-348
• Serial:
  • Volume: 122
  • Issue Number: 4

Subject/Index Terms

• TRT Terms: Construction; Detectors; Eddy currents; Inspection; Pipelines; Subways; Tunneling
• Old TRIS Terms: Eddy current inspection; Subway construction
• Subject Areas: Bridges and other structures; Construction; Pipelines; Railroads; Terminals and Facilities;

Filing Info

• Accession Number: 00126972
• Record Type: Publication
• Source Agency: British Railways
• Files: TRIS
• Created Date: Nov 5 1975 12:00AM