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A corrosion-resistant component is provided for a corrosion-resistant tube assembly. The component includes a corrosion-susceptible metal tube and a sleeve of corrosion-resistant metal mechanically joined to the tube for protecting the end portions of the tube. The sleeve includes a first portion te

A corrosion-resistant component is provided for a corrosion-resistant tube assembly. The component includes a corrosion-susceptible metal tube and a sleeve of corrosion-resistant metal mechanically joined to the tube for protecting the end portions of the tube. The sleeve includes a first portion terminating in a ring-shaped second portion. The first portion annularly extends about a surface of a tube and is mechanically joined thereto. A second portion of the sleeve overlies the annular end surfaces of the corrosion-susceptible tube. The component includes a corrosion-resistant liner for the tube which is sealed with an inside surface of a portion of the sleeve about the circumference by an expansion joint between the liner and tube. A corrosion-resistant tube assembly having a corrosion-resistant component is also provided such that tubes are mechanically and threadably joined by the sleeves. The assembly has all inside surfaces of the tube assembly of corrosion-resistant material. An annular notch may be provided in the sleeve or tubing or both to receive the sealing and expansion ring.

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In a corrosion-resistant tube assembly, a corrosion-resistant component comprising: a corrosion-susceptible metal tube having an outside surface, an inside surface and end surfaces, and to be located adjacent another of said tube near their end surfaces; an overlay sleeve of corrosion-resistant meta

In a corrosion-resistant tube assembly, a corrosion-resistant component comprising: a corrosion-susceptible metal tube having an outside surface, an inside surface and end surfaces, and to be located adjacent another of said tube near their end surfaces; an overlay sleeve of corrosion-resistant metal having a first and second portion, said first portion annularly extending about a surface of said tube and one surface of said sleeve adjacent the tube being mechanically joined to at least a portion of the tube surface, said first portion terminating in a second portion of the sleeve overlying the annular end surface of said tube, said sleeve other surface of said first portion disposed away from the surface of said tube and being threaded; and a corrosion-resistant, tubular metallic liner having an outside surface, an inside surface and end surfaces, the outside surface of the liner being adjacent the entire circumference of the inside surface of the corrosion-susceptible metal tube along its longitudinal extent; the improvement comprising: a corrosion-resistant annular expansion-sealing ring annularly fixed to the end surface of the liner and positioned at a location at the end surface of the corrosion-susceptible tube and between the liner and inside surface of the second portion of the sleeve and bearing thereagainst to seal the corrosion-susceptible metal tube about the circumference thereof from any corrosives in the tube assembly and to provide an expansion joint between the liner and tube.