Patent ID: 9341419
Filing Date: 2016-05-17
CPC Classification: B23P,F16L,F28F,Y02P,Y10T

Claim Text:
1. A metallic tube assembly, comprising: a tube plate and a metallic tube configured to resist the corrosive action of a process fluid, said metallic tube comprising: a first tubular element which homogeneously extends for the whole length of the metallic tube, defines the internal surface of the metallic tube, consists of a first metal material selected from the group consisting of zirconium, niobium, and alloys of zirconium and niobium; and is provided with a recessed seat at least in proximity of one of its opposite ends along the external surface of the first tubular element; a second tubular element which consists of a second metal material selected from the group consisting of titanium, titanium alloys, and urea grade stainless steel; the second tubular element being seal attached to the first tubular element by a metallurgical bond extending over a first contact area of the first tubular element and the recessed seat, a third tubular element which consists of a third metal material different from the first metal material and the second metal material; the third tubular element being seal attached to the first tubular element by a metallurgical bond extending over a second contact area of the first tubular element and the recessed seat, the third tubular element having a first end and a second end, the first end being seal attached to the recessed seat, wherein the second tubular element has first and second ends, the first end distal to the tube plate and the second end proximal to the tube plate, wherein the first end is seal attached to the second end of the third tubular element, wherein the metallic tube is connected to the tube plate with a metallurgical bond such that the end of the metallic tube is substantially perpendicular to the tube plate and penetrates the tube plate, and wherein the second tubular element of the metallic tube penetrates the tube plate and extends beyond the tube plate to which the metallic tube is fixed, and the second tubular element has a length such that the tube plate is not in direct contact with the first tubular element.