Importance

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Abstract

A method and apparatus for joining the ends of concentric inner and outer tube to a double containment fitting are disclosed, as are related methods of fabrication and systems. The apparatus uses a threaded coupling to compressively engage and seal the ends of both the inner and outer tubes to the double containment fitting. The double containment fitting includes inner and outer noses and a threaded annular body and annular nut. The inner nose may be at least partially inserted within a flared end of the inner tube, and the outer nose may encircle the inner tube and be inserted within the flared end of the outer tube. The inner and outer noses and the inner and outer tubes may be engaged in a relationship within bores through the annular body and the annular nut. Threadably engaging the annular nut with the annular body may establish seals between the components.

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First Claim