[특허]Sleeve repair of degraded nuclear steam generator tubes

[미국특허] Sleeve repair of degraded nuclear steam generator tubes 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B23K-020/08
출원번호	US-0838069 (1986-03-10)
발명자 / 주소	Ayres Paul S. (Alliance OH) Stark Louis E. (Youngstown OH) Feldstein Joel G. (North Canton OH) Fu Tzerong (Stow OH)
출원인 / 주소	The Babcock & Wilcox Company (New Orleans LA 02)
인용정보	피인용 횟수 : 110 인용 특허 : 0

초록 ▼

A sealable multimetallic sleeve for a rapid repair of a degraded tube caused by a detrimental chemical attack on the outside surface of the tube within and in a vicinity of a tube sheet in a steam generator, and the method for sealably inserting the sleeve in the degraded tube spanning the region of the degradation. The sleeve includes an inner member with equivalent mechanical properties of the degraded tube and an outer member metallurgically bonded to the inner member and resistive to caustic intergranular chemical attack causing tube degradation. The sleeve has an expanded portion at one end for positioning in the tube within the tube sheet and a multiplicity of grooves in and adjacent to the other end of the sleeve and braze material contained in the grooves.

대표청구항 ▼

A method of repairing degraded nuclear steam generator tubes vertically disposed within and having a degraded area in the vicinity of a tube sheet, comprising the steps of: forming a sleeve having an inner hollow core of substantially the same material as that of the degraded tube and an outer surface made of a nickel alloy with a minimum content of 99% by weight of nickel, metallurgically bonded to the inner hollow core, said sleeve having a length extending from a lower end to an upper end over a distance sufficient to span the degraded area when the lower end is located within the tube sheet; forming a plurality of annular rings of a brazing material on the outside surface at axially spaced intervals along the sleeve proximate the upper end; cleaning the interior surface of the tube above and below the degraded area; inserting an explosive device in the sleeve at the elevation of the rings containing brazing material; inserting the sleeve and the explosive device in the degraded tube and positioning the lower end of the sleeve flush with the lower end of the degraded tube; explosively expanding the sleeve to the tube above the degraded area to form a mechanical joint between the outer nickel member of the sleeve and the tube; removing the spent explosive device and introducing a flow of an inert gas from the other end of the tube undergoing repair to purge oxygen from the vicinity of the expanded sleeve before and during a subsequent brazing operation; inserting an induction heater into the expanded sleeve and brazing the material contained in the grooves to the tube and the sleeve; removing the induction heater and inserting an explosive device into the lower end of the expanded sleeve slightly above the lower face of the tube sheet; and detonating the explosive device thereby welding the outer nickel member of the sleeve to the tube.

이 특허를 인용한 특허 (110) 인용/피인용 타임라인 분석

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
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[미국특허] Sleeve repair of degraded nuclear steam generator tubes 원문보기

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[미국특허] Sleeve repair of degraded nuclear steam generator tubes 원문보기

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