Patent ID: 8028565

Claim:
Apparatus for testing or isolating a nozzle having an inner end opening into the interior of a vessel and an outer end extending externally from said vessel, said apparatus comprising: a cylindrical rod for insertion through said nozzle into the interior of the vessel; a cap for enclosing a space surrounding the inner end of said nozzle, said cap comprising: i) a cap upper portion having a top and a bottom, ii) a cap skirt having an inner surface and extending downwards from the bottom of said upper portion of said cap, iii) a cap seal disposed concentrically around the inner surface of said cap skirt, a bottom surface of said cap seal adapted to engage an inner surface of a wall of the vessel, said cap seal actuatable in response to applied fluid pressure to expand outwardly from the bottom of said cap upper portion along the inner surface of said cap skirt and in the direction of said inner surface of a wall of the vessel to maintain sealing contact with said inner surface of a wall of the vessel when said cap upper portion and said cap skirt are forced away from said inner surface by said applied fluid pressure; and a flange assembly for forming a fluid-tight seal with the outer end of said nozzle; wherein said cap, said rod and said flange assembly are adapted to interconnect to form a fluid-tight chamber that isolates said nozzle from the interior of said vessel.