Accession Number : ADP010218

Title :   Eddy-Current Examination of Large-Diameter Insulated Pipes

Corporate Author : JOINT OIL ANALYSIS PROGRAM PENSACOLA FLTECHNICAL SUPPORT CENTER

Personal Author(s) : Griffith, John C.

PDF Url : ADP010218

Report Date : APR 1996

Pagination or Media Count : 9

Abstract : A new concept eddy current technique has been developed to examine large diameter insulated pipes without removing the insulation, and in many cases, without securing system operation. The new concept allows the in place examination of piping systems using an encircling eddy current coil that is a proven eddy current technology. Eliminating the requirement to secure or drain the system or to remove the insulation from the pipe provides significant cost savings. The new concept also provides a significantly higher percentage of inspection volume coverage than ultrasonic techniques despite limitations of pipe brackets and other physical obstructions. The technique has been demonstrated on copper, copper nickel and limited carbon steel pipe ranging from 4 to 8 inches in diameter with insulation thicknesses from 1 to 2 inches.

Descriptors :   *SYMPOSIA, *PIPES, *EDDY CURRENTS, NONDESTRUCTIVE TESTING, MONITORING, ELECTRIC COILS.

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Test Facilities, Equipment and Methods
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE