Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1992-12-17
1994-11-29
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
29890036, 29727, B23P 1500
Patent
active
053677684
ABSTRACT:
A method of repairing a tubular nozzle made of Inconel 600 material and extending through a bore in an external wall of a pressure vessel to provide communication with the interior of the vessel from externally thereof includes mechanically rolling the inside diameter of a portion of the nozzle disposed within the external wall with a roll pressure in the range of 50,000 to 150,000 psi to form a circumferential rolled section in the nozzle having a wall thickness 3% to 12% less than the wall thickness of non-rolled sections of the nozzle, an outside diameter less than 1% greater than the outside diameter of the non-rolled sections and transition segments with a radius of curvature in the range of 1/2 inch to 2 inches joining the rolled section to the non-rolled sections. A stress of approximately 60,000 psi is created in the nozzle along the rolled section to produce surface yielding of the outside diameter of the nozzle, and an interference fit pressure in excess of the equipment operating pressure for the vessel is created between the outside diameter of the nozzle and the external wall of the vessel. A tubular sleeve made in its entirety of Inconel 690 material can be positioned in the previously rolled nozzle to extend along the entire length of the nozzle susceptible to cracking, and the inside diameter of the sleeve rolled along the entire length of the sleeve to create an interference fit between the outside diameter of the sleeve and the inside diameter of the nozzle.
REFERENCES:
patent: Re30802 (1981-11-01), Rogers, Jr.
patent: 4448343 (1984-05-01), Kochka et al.
patent: 4580426 (1986-04-01), Zafred
patent: 4586249 (1986-05-01), Costlow et al.
patent: 4592577 (1986-06-01), Ayres et al.
patent: 4639994 (1987-02-01), Cooper, Jr. et al.
patent: 4649492 (1987-03-01), Sinha et al.
patent: 4649493 (1987-03-01), Castner et al.
patent: 4653164 (1987-03-01), Cooper, Jr. et al.
patent: 4724693 (1988-02-01), Tedder
patent: 4779445 (1988-10-01), Rabe
patent: 4783890 (1988-11-01), Gaudin
patent: 4793044 (1988-12-01), Cartry et al.
patent: 4827594 (1989-05-01), Cartry et al.
patent: 4847967 (1989-07-01), Gaudin
patent: 5027507 (1991-07-01), Nelson et al.
patent: 5062199 (1991-11-01), Kelly
patent: 5101559 (1992-04-01), Gelpi et al.
patent: 5149490 (1992-09-01), Brown et al.
Installation at Big Rock Point, 1979.
Installation at Oyster Creek, Nine Mile Point, 1974.
Cuda Irene
MPR Associates, Inc.
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