Dielectric gasket

A dielectric gasket comprising;

• an annular disk with at least one portion formed from an electrically non-conducting material and the annular disk having a first face and a second face;
• at least one seal groove formed within the first face;
• at least one seal groove formed within the second face;
• a seal disposed within each first face seal groove;
• a seal disposed within each second face seal groove;
• the annular disk having a first annular ring manufactured from a first electrically non-conducting material;
• the annular disk having a second annular ring manufactured from a second electrically non-conducting material to prevent transport of gas and liquids, the second annular ring being concentrically disposed within the first annular ring;
• the electrically non-conducting materials of the first and second annular rings formed from a material from the group consisting of thermosetting resin, woven fibrous reinforcement material, and non-woven fibrous reinforcement material;
• and
• the seal grooves formed within the first face and the second face of the second annular ring wherein the seal is formed from engineered materials for preventing transport of gas and liquids to the first annular ring.

A dielectric gasket for use in a connection between a first pipe joint and a second pipe joint comprising:

• an outer annular disk formed from an electrically non-conducting material having two substantially parallel faces, an inside diameter surface substantially perpendicular to the faces, and a rabbit groove formed on the edge of each face at the inside diameter;
• an inner annular disk formed from an electrically non-conductive material having two substantially parallel faces, an outside diameter surface substantially perpendicular to the faces, and a rabbit groove formed on the edge of each face at the outside diameter, the inner annular disk being concentrically disposed within the inside diameter of the outer annular disk;
• the inner annular disk and the outer annular disk having substantially equal thickness and formed from a single piece of electrically non-conducting material whereby the inner annular disk and outer annular disk form a matched set;
• a seal disposed between the inside diameter of the outer annular disk and the outside diameter of the inner annular disk formed from an electrically non-conducting thermoplastic material, the outside diameter surface of the seal perpendicular to the faces of the seal and formed to allow the seal to be slidably disposed inside of the outer annular disk prohibiting relative concentric movement between the outer annular disk and the seal;
• the seal further having a nubbin formed on the outside diameter of the seal at the edge of each face to substantially prohibit relative axial movement between the outer annular disk and the seal by registering each nubbin into the mating rabbit groove of the outer annular disk;
• at least one circumferential groove disposed beneath and formed substantially parallel to each seal face within the inside diameter of the seal to allow the seal faces to deflect with cantilever like motion;
• a circumferential pedestal axially centered between the seal faces and circumferential grooves with an inside diameter sized to allow the inner annular disk to be slidably disposed inside of the seal with a fit that substantially prohibits relative concentric movement between the seal and the inner annular disk;
• the inside diameter of both seal faces formed to mate with the rabbit grooves of the inner annular disk to prohibit relative axial movement between the inner annular disk and the seal;
• and
• the face to face thickness of the seal greater than the face to face thickness of the inner annular disk and the outer annular disk.