Double-wall tube for a heat exchanger
AssigneeNovatome
InventorBernard Libin
Life of this patent
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Abstract
A double-wall tube for a heat exchanger and method for producing same, the tube being formed by two tubular walls (1, 2) mounted one inside the other with a very small clearance (3)and then made to have a tight fit therebetween, the outer surface of the inner wall (2) and the inner surface of the outer wall (1) being interconnected by a thin layer of brazing metal in regions (4) which are discontinuous both in the circumferential direction and in the longitudinal direction of the tube. The brazed regions (4) represent 5 to 15% of the confronting surfaces of the inner wall (2) and outer wall (1) of the tube. The invention is in particular applicable to steam generators of fast neutron nuclear reactors.
Claims8
A double-wall tube for a heat exchanger having two fluids, the tube comprising an inner tubular wall and outer tubular wall, the inner wall being disposed coaxially inside the outer wall with a very small clearance therebetween,with a subsequent tight fit therebetween, the inner wall having a smaller diameter being adapted to come into contact with one of said fluids by an inner surface and the outer wall having a larger diameter being adapted to come into contact with the other fluid by an outer surface, and a layer of brazing metal having a thickness between 10 and 30 microns interconnecting the outer surface of the inner wall and the inner surface of the outer wall in regions which are discontinuous both in a circumferential direction and in a longitudinal direction of the tube and together represent between 5 and 15% of confronting surfaces of the inner and outer walls of the tube.
Dependencies are inferred from the claim text.