Metal working – Method of mechanical manufacture – Repairing
Patent
1988-07-14
1990-08-07
Rosenbaum, Mark
Metal working
Method of mechanical manufacture
Repairing
2940218, 2940221, B23P 700
Patent
active
049456237
ABSTRACT:
A method of repairing leaky compression fitting seal joints between a pressure stub tube (22) projecting from a nuclear reactor head (12) and a cylindrical thermocouple body (24) concentrically mounted in the stub tube (22) for penetration of the reactor pressure boundary. The method includes the steps of loosening and disassembling compression fitting nuts (30,32) and fitting body (34) to expose, and remove by grinding, a cammed ferrule radial compression means (26,28), cleaning the surfaces to be sealed, axially telescoping a split collar (40) between the tube (22) and the thermocouple body (24) and providing split rings (44,46) of brazing material surrounding the thermocouple body adjacent the exposed ends of the tube (22) and the collar (40). Resistance heating the tube and, therefore, the brazing material and repositioning and reassembling the fitting body (22) and fitting nuts (30,32) to complete the repaired seal joint.
REFERENCES:
patent: 1926517 (1933-09-01), Filippi et al.
patent: 1975495 (1934-10-01), Armacost
patent: 3219397 (1965-11-01), Heldenbrand et al.
patent: 3928029 (1975-12-01), Fisk et al.
patent: 4597436 (1986-07-01), Hagemeister et al.
patent: 4603463 (1986-08-01), Wolbert et al.
"Swagelok" Tube Fitting, pp. 2-3.
Chin Frances
Combustion Engineering Inc.
Mulholland John H.
Rosenbaum Mark
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