Inert-metal lined steel-bodied vessel end-closure device

A steel-body gas storage vessel having

• an interior surface defining an interior volume, and at least one vessel end piece, wherein said at least one vessel end piece has an interior surface having threads wherein a coating of relatively inert, corrosion resistant, metal covers entirely said interior surface and said at least one vessel end piece proximate said threaded portion;
• and,
• at least one end closure device having a gas transfer means, a securing portion carrying exterior threads for engaging said vessel end piece interior treads, and a sealing portion having a surface of a relatively inert, corrosion resistant, metal carrying an annular sealing gland such that said securing portion restrains said sealing portion in sealing engagement with said coating in said at least one vessel end piece to provide a non-contaminated sealing surface to retain gas in said vessel at service pressures.

A seamless steel-body gas storage cylinder having an exterior surface, an interior surface, an interior region, first and second vessel end pieces, wherein at least one vessel end piece has interior threads wherein a coating of relatively inert corrosion resistant metal, entirely covers the interior surface of said cylinder and at least one vessel end piece proximate the interior threaded portion, and;

• at least one end closure device having a sealing portion, substantially covered with, a relatively inert, corrosion resistant, metal and a steel, securing portion, bearing exterior threads for engaging the interior threads of the vessel end piece wherein the sealing portion further carries an annular sealing gland in communication with the relatively inert, corrosion resistant, metal surface of the sealing portion for seating the securing portion of said at least one end closure device in a vessel end piece to facilitate sealing engagement of the sealing gland with the metal coating on interior surface of the vessel end piece.

A vessel end closure device, for a steel-body gas storage vessel, for the pressurized storage and transfer of ultra-pure gases, having an electroplated lining of a metal, which is relatively inert to the stored gas, and having at least one vessel end piece, carrying internal threads comprising:

• a securing portion having exterior-engaging threads for engaging the interior threads of the vessel end piece;
• and,
• a sealing portion, having a surface of a relatively inert, corrosion resistant, metal which carries an annularly disposed sealing gland such that when the vessel end closure device is seated in the vessel end piece a removable corrosion free liquid/gas wetted seal for the inert-metal lined, steel-body vessel is formed.

A method for sealing a steel-body gas storage vessel, for the pressurized storage and transfer of ultra-pure gases, having an electroplated lining of a metal, which is relatively inert to the stored gas, and having at least one vessel end piece, carrying internal threads with a vessel end closure device having a securing portion having exterior-engaging threads for engaging the interior threads of the vessel end piece;

• and, a sealing portion, having a surface of a relatively inert, corrosion resistant, metal which carries an annularly disposed sealing gland comprising the step of:
• tightening said exterior engaging threads into the interior threads of the vessel end piece, such that the annularly disposed sealing gland forms a removable corrosion free liquid/gas wetted seal with the inert-metal lined vessel end piece of the steel-body vessel.