Global Patent Index - EP 0998678 A1

EP 0998678 A1 2000-05-10 - METHOD OF DETECTING CORROSION IN PIPELINES AND THE LIKE BY COMPARATIVE PULSE PROPAGATION ANALYSIS

Title (en)

METHOD OF DETECTING CORROSION IN PIPELINES AND THE LIKE BY COMPARATIVE PULSE PROPAGATION ANALYSIS

Title (de)

VERFAHREN ZUM NACHWEIS VON KORROSION IN ROHRLEITUNGEN O.A. MIT HILFE VERGLEICHENDER PULSAUSBREITUNGSANALYSE

Title (fr)

PROCEDE DE DETECTION DE CORROSION DANS DES PIPELINES ET ANALOGUE PAR ANALYSE COMPARATIVE D'IMPULSIONS DE PROPAGATION

Publication

EP 0998678 A1 (EN)

Application

EP 98930074 A

Priority

  • US 9811683 W
  • US 4866097 P

Abstract (en)

[origin: WO9855877A1] A method of dectecting corrosion on an elongate member (10), such as a pipe (10). Far side and near side electric pulses are transmitted into a magnetically permeable pipe (10) at spaced locations to travel toward one another. These are synchronized to intersect at various locations on the pipe (10). The resulting waveforms are analyzed by combining adjacent waveforms resulting from pulses intersection at spaced locations. Two combined waveforms are analyzed by subtracting one from the other to produce a difference waveform and the difference waveforms are compared to detect corrosion.

IPC 1-7 (main, further and additional classification)

G01R 29/02

IPC 8 full level (invention and additional information)

G01N 17/00 (2006.01)

CPC (invention and additional information)

G01N 17/00 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9855877 A1 19981210; AU 7954598 A 19981221; CA 2293500 A1 19981210; CA 2293500 C 20101214; EP 0998678 A1 20000510; EP 0998678 A4 20020213

INPADOC legal status


2006-05-03 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20051026

2005-06-01 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20050415

2002-11-20 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000217

2002-02-13 [A4] SUPPLEMENTARY SEARCH REPORT

- Ref Legal Event Code: A4

- Effective date: 20020102

2002-02-13 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-02-13 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- Free Format Text: 7G 01R 29/02 A, 7G 01N 17/00 B

2000-05-10 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE