Corrosion ring gauge and method

Details Corrosion ring gauge and method Corrosion ring gauge and method

1999-02-23

2000-04-11

Raevis, Robert

Measuring and testing

Embrittlement or erosion

G01N 1700

Patent

active

060475919

ABSTRACT:
The invention is a corrosion ring gauge for evaluating the limit of allowable corrosion on the mated surfaces defining the gasket seating area of a bolted pipe flange, and a method for performing the evaluation. The invention includes a ring having an interior edge corresponding to the allowable radial corrosion advancement on a mated surface when the ring is centered on the mated surface. Attached to the ring are at least two centering pins, each of which is aligned with the position of a bolt bore on the flange when the ring is centered on a mated surface. The method of the invention involves centering the corrosion ring gauge on a mated surface and marking the location of the interior edge of the ring on the mated surface. After removing the corrosion ring gauge from the mated surface, a straight edge is positioned on the mated surface so that it intersects the marked location. Light transmitting between the straight edge and mated surface is detected to determine if light is transmitted radially beyond said marked location.

REFERENCES:
patent: 5447057 (1995-09-01), Shaw et al.
patent: 5739424 (1998-04-01), Beavers

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