Method of measuring joint gaps and restoring same

Details Method of measuring joint gaps and restoring same Method of measuring joint gaps and restoring same

1989-07-28

1991-07-16

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Impeller making

29888021, 298883, 29890121, 29890128, 29407, 29557, B23P 1500, B23P 1304

Patent

active

050313142

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.

REFERENCES:
patent: 4118139 (1978-10-01), Lemelson
patent: 4860650 (1989-08-01), Houser
patent: 4895448 (1990-01-01), Laird

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