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:
Jul. 16, 1991
Filed:
Jul. 28, 1989
David B Berrong, Oviedo, FL (US);
Stephen J Tencza, Norristown, PA (US);
Gerald I Marron, Broomall, PA (US);
John F Daniels, Glenolden, PA (US);
Cletus L Schartner, St. Petersburg, FL (US);
Ronald P Cupo, Ridley Park, PA (US);
John J McGettigan, Middletown Township, Delaware County, PA (US);
Philip W Ketterer, Hightstown, NJ (US);
Lawrence J Coyle, Wilmington, DE (US);
Freddie G King, Spotsylvania, VA (US);
Clifford T Parker, Chester, PA (US);
Craig J Zurat, Cressona, PA (US);
John L Morris, New Castle, DE (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
The method of the present invention uses a combination of gap measurement methods to map the gap in a joint in a high pressure vessel such as a steam turbine or steam valve. An exposed and supported surface is hydraulically balanced allowing any twisting of the surface to be removed. The map is then created using a blue contact method, feeler gages, deformable gap measuring medium and laser profiling for both surfaces of the joint. A restoration plan is produced using the map which minimizes the restoration work and produces matching joint surfaces. The joint surfaces are welded and/or machined and finally finished in accordance with the plan. A laser can be used to guide or reference the machine tool. Matching joint surfaces, especially if relatively flat, provide a better high pressure seal than relatively flat surfaces that do not match while relatively flat surfaces that do match produce an even better seal.