Closure fitting and flexibility support assembly for double-containment piping systems

A closure fitting assembly for closing a gap between containment components in a double-containment system, comprising:

• a first fitting defining an axis and including a first axially-extending fusion surface located on one side of the first fitting, a second axially-extending fusion surface located on an opposite side of the first fitting relative to the first axially-extending fusion surface, a first circumferentially-extending fusion surface located on one end of the first fitting, and a second circumferentially-extending surface located on an opposite end of the first fitting relative to the first circumferentially-extending fusion surface;
• a second fitting for connection to the first fitting to close the gap between containment components, the second fitting defining an axis and including a first axially-extending fusion surface located on one side of the second fitting and facing the corresponding first axially-extending fusion surface of the first fitting, a second axially-extending fusion surface located on an opposite side of the second fitting relative to the respective first axially-extending fusion surface and facing the corresponding second axially-extending fusion surface of the first fitting, a first circumferentially-extending fusion surface located on one end of the second fitting, and a second circumferentially-extending fusion surface located on an opposite end of the second fitting relative to the respective first circumferentially-extending fusion surface;
• at least one first axially-extending fusion wire interposed between the two first axially-extending fusion surfaces for the passage of electric current through the first axially-extending wire to fuse the two first axially-extending fusion surfaces together;
• at least one second axially-extending fusion wire interposed between the two second axially-extending fusion surfaces for the passage of electric current through the second axially-extending wire to fuse the two second axially-extending fusion surfaces together;
• at least one first circumferentially-extending fusion wire seated against the first circumferentially-extending fusion surfaces for the passage of electric current through the first circumferentially-extending wire to fuse the first circumferentially-extending fusion surfaces to an adjacent containment component;
• and
• at least one second circumferentially-extending fusion wire seated against the second circumferentially-extending fusion surfaces for the passage of electric current through the second circumferentially-extending wire to fuse the second circumferentially-extending fusion surfaces to an adjacent containment component.