Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1989-03-01
1991-07-02
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
2940201, 2940219, 29407, 29523, 29890044, B23P 1526
Patent
active
050275070
ABSTRACT:
A method of controlling leakage through degraded heat exchanger tubes in the tubesheet region of a nuclear steam generator is disclosed herein. The method comprises radially expanding a section of the heat exchanger tube disposed within the bore of the tubesheet into leak resistant engagement so that the resultant leakage flow is equal to or less than an acceptable leakage flow rate. The expanded, leak resistant section is located above the degraded section of the heat exchanger tube and below the upper side of the tubesheet. The length L of the leak resistant section and the pressure P necessary to create it are determined by ascertaining a plurality of combinations of length Lx and pressure Px that would result in a sufficiently tight engagement between the heat exchanger tube and the tubesheet bore to achieve the desired leakage flow rate, and by choosing a combination of Lx, Px that results in the smallest length L without exceeding a pressure of 50 ksi (344.7 MPa).
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Keating Robert F.
Nelson Lawrence A.
Cuda Irene
Westinghouse Electric Corp.
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