Heat exchanger tube repair

Details Heat exchanger tube repair Heat exchanger tube repair

1984-04-04

1985-12-17

Albritton, C. L.

Electric heating

Metal heating

For bonding with pressure

219 602, 219 85R, 228119, B23K 120

Patent

active

045594368

ABSTRACT:
Prior to effecting a repair of a leaking heat exchanger tube by an internal repair tube brazed to the leaking tube, strain in the leaking tube is measured while heating it to brazing temperature. A braze is only effected if the strain is below a predetermined level. Apparatus for carrying out the strain measurement typically of probe form having a strain gauge head (21) at the nose of the probe and a heater element (23). Preferably, the length of the probe is such that the head (21) reaches to just above a grid support plate (12). Where strain is found to be above said predetermined level and the leaking tube is of U-shape the strain may be relieved by heating both legs of the tube. Alternatively, strain may be relieved by thinning and bulging the leaking tube (FIGS. 5A-C) at a region close enough to the braze for the thinned zone to experience heat from the braze to allow it to yield under the strain.

REFERENCES:
patent: 3806693 (1974-04-01), Miller
patent: 4283615 (1981-08-01), Vrillon
patent: 4386458 (1983-06-01), Evans
patent: 4448343 (1984-05-01), Kochka et al.
Olds, F. C., "Sleeving Saves Nuclear Steam Generator Tubes", Power Engineering (Dec. 1981), pp. 73-75.

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