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:
Nov. 15, 2005
Filed:
Oct. 09, 2003
Kazuhiro Saito, Kanagawa-Ken, JP;
Kazunari Fujiyama, Kanagawa-Ken, JP;
Taiji Hirasawa, Kanagawa-Ken, JP;
Satoshi Nagai, Kanagawa-Ken, JP;
Toshihiro Fujiwara, Kanagawa-Ken, JP;
Hitoshi Kichise, Kanagawa-Ken, JP;
Hirotsugu Kodama, Tokyo, JP;
Mitsuyoshi Okazaki, Saitama-Ken, JP;
Kazuhiro Saito, Kanagawa-Ken, JP;
Kazunari Fujiyama, Kanagawa-Ken, JP;
Taiji Hirasawa, Kanagawa-Ken, JP;
Satoshi Nagai, Kanagawa-Ken, JP;
Toshihiro Fujiwara, Kanagawa-Ken, JP;
Hitoshi Kichise, Kanagawa-Ken, JP;
Hirotsugu Kodama, Tokyo, JP;
Mitsuyoshi Okazaki, Saitama-Ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
The present invention provides a method of inspecting a target component part (e.g., valve casing) of an apparatus (e.g., steam control valve) included in a steam turbine system. When a time period in a range of 24 to 100 hours passes from the shutting-down of the turbine system, or before a temperature of an atmosphere surrounding the component part is lowered to 100° C., the width of the opening of the crack formed in the component part or a clearance relating to the component part is measured without disassembling the target component part and an enclosing member (e.g., valve casing) from the apparatus. As the measurement is performed when a thermal stress is induced in the component parts or when the temperature distribution is wide, the risk level of the crack or the clearance is determined accurately.