Apparatus for the introduction of a sleeve into a tube of a steam generator
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United States of America Patent
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-
Jul 3, 1990
Grant Date -
N/A
app pub date -
Apr 12, 1989
filing date -
Apr 14, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an apparatus for the introduction of a repair sleeve into a tube of a steam generator, difficulties are encountered if the axes of the repair sleeve and the steam generator tube are not aligned. Furthermore, problems are encountered in positioning the repair sleeve exactly in its end position. In order to achieve a precise centering and positioning of the repair sleeve, an aperture is formed by a connecting sleeve which is resiliently supported in the axial direction. The repair sleeve is clamped between a first shoulder of a holding grip and a centering piece which has a variable outside diameter. In such a structure, the greatest diameter of the shoulder surface is less than the inside diameter of the connecting sleeve. The holding grip is associated with a second shoulder having an axial distance from the first shoulder which is further away from the tube sheet than the first shoulder by the height of the connecting sleeve. The shoulder surface of the second shoulder comes into contact with an end surface of the connecting sleeve facing away from the tube sheet, while an end surface of the connecting sleeve facing the tube sheet contacts the tube sheet.
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