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1. (WO1997015835) PORTABLE PIPE DEFECT DETECTING APPARATUS AND METHOD
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015835 International Application No.: PCT/US1996/017135
Publication Date: 01.05.1997 International Filing Date: 25.10.1996
Chapter 2 Demand Filed: 07.05.1997
IPC:
G01N 27/90 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
72
by investigating magnetic variables
82
for investigating the presence of flaws
90
using eddy currents
Applicants:
BURNETT, Gale, D. [US/US]; US
Inventors:
BURNETT, Gale, D.; US
Agent:
HUGHES, Robert, B.; Hughes, Multer & Schacht, P.S. 1720 Iowa Street Bellingham, WA 98226, US
Priority Data:
60/005,99327.10.1995US
null25.10.1996US
Title (EN) PORTABLE PIPE DEFECT DETECTING APPARATUS AND METHOD
(FR) APPAREIL PORTABLE ET PROCEDE DE DETECTION DE DEFAUTS DANS LES TUYAUX
Abstract:
(EN) A method of testing an elongate member, such as a pipe (12) carrying petroleum products or other liquids, and particularly where the pipe has a layer of insulation (34). There is a portable testing apparatus (16) where a pair of antennas (20, 22) are mounted to a portable support structure at spaced locations. The antennas are placed adjacent to the pipe, and a pulse (46) having a relatively sharp rise time is transmitted along the pipe so as to pass by test locations at the first and second antennas. Where there is a corroded section of pipe between the antennas, there are modifications in the pulse (48a, 48b) which can be analyzed to identify the area of corrosion.
(FR) L'invention concerne un procédé d'essai d'un élément allongé tel qu'un tuyau (12) dans lequel circulent des produits pétroliers ou d'autres liquides, et en particulier un tuyau doté d'une couche d'isolation (34). Elle porte aussi sur un appareil d'essai portable (16) comprenant une paire d'antennes (20, 22) montées sur une structure de support portable, en des points espacés. Les antennes sont adjacentes au tuyau et une impulsion (46) présentant un temps de front relativement court est envoyée le long du tuyau de sorte qu'elle passe par les point d'essai au niveau des première et seconde antennes. Lorsqu'une partie du tuyau située entre les antennes est corrodée, on constate une modification de l'impulsion (48a, 48b), que l'on peut analyser pour identifier la zone de corrosion.
Designated States: AM, AT, AU, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, ES, FI, GB, GE, HU, JP, KE, KG, KP, KR, KZ, LK, LT, LU, LV, MD, MG, MN, MW, NO, NZ, PL, PT, RO, RU, SD, SE, SI, SK, TJ, TT, UA, UZ, VN
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
CA2236215AU1996074754