Steam generator tube repair method and assembly

Details Steam generator tube repair method and assembly Steam generator tube repair method and assembly

1985-06-24

1988-02-09

Marcus, Stephen

Pipes and tubular conduits

Repairing

138 89, 29447, F16L 5510

Patent

active

047235780

ABSTRACT:
A steam generator tube repair assembly employs a stud having a shaft and a head which forms a transverse sealing surface. A driver wedge has a central axial bore for receiving the shaft and a generally frustoconical exterior surface for receiving a sealing sleeve. The sealing sleeve has a circumferentially extending sealing surface and an end surface which is adapted for sealing engagement with the sealing surface of the stud head. A coupling nut is tightened to force the driver wedge to swage the sealing sleeve for radial sealing engagement and also transverse sealing engagement. The driver wedge and or the sealing sleeve are formed of shape memory materials so that at a temperature below a transition temperature the diametral dimensions of the sealing sleeve are reduced and at a temperature above the transition temperature the diametral dimensions of the sealing sleeve are expanded into sealing engagement with the tube.

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"Polytechnic Cable", article (Polytechnic Institute of New York), Nov. 1979, p. 1.

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