The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 2000
Filed:
Jun. 16, 1998
Keiichi Iwamoto, Nagasaki, JP;
Kiyotaka Aoki, Nagasaki, JP;
Hironori Ishii, Nagasaki, JP;
Shinichi Tsuji, Kitakyushu, JP;
Kinjiro Kobayashi, Nagasaki, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Shin-Nippon Nondestructive Inspection Co., Kitakyushu, JP;
Kyusyugiken Co., Ltd., Nagasaki, JP;
Abstract
A tube flaw detecting method detects a flaw portion in a heat exchanger tube constituting a boiler furnace wall using two probes, enabling one to carry out appropriate inspection work with a high efficiency. A transmitter probe and a receiver probe are juxtaposed in a circumferential direction, and an ultrasonic wave is transmitted from the transmitter probe to propagate. Repeated reflections occur at a tube inner surface and tube outer surface, and the wave is reflected at a crack extending in the circumferential direction to return, propagating likewise to be received by the receiver probe so that existence of the crack is confirmed. Thus, inspection work for a crack can be done with certainty with a simple arrangement.