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. 27, 1998
Filed:
Mar. 13, 1997
MAN Gutehoffnungshutte Aktiengesellschaft, Oberhausen, DE;
Abstract
A process for repairing heat exchanger tubes by partial tube replacement in the inside of closed tube apparatus with at least one cylindrical tube bottom from the tube side, wherein dents observed are first straightened, and a damaged partial tube section is separated and removed. A new partial tube section is then pushed in through a hole in the tube bottom. The joining of the new partial tube to the heat exchanger tube remaining inside the heat exchanger is performed by inner tube welding by means of an inner tube welding device, which is fastened to a bracket and a drive and is introduced through the new partial tube. Tests are performed after the welding together of the partial tube and the heat exchanger tube to demonstrate the quality.