Pipe isolation joints for electrical isolation of heating tubes segments in electric impedance furnaces

A connection assembly comprising:

• an electrically conductive first flange defining a first opening;
• an electrically conductive second flange defining a second opening;
• an insulating disc defining a disc opening, the insulating disc comprising an electrically non-conductive material that will remain solid and electrically nonconductive at temperatures up to at least 300° C. and voltages up to at least 200 Volts;
• a plurality of fastener insulators comprising an electrically non-conductive material, each fastener insulator defining one or more fastener holes;
• one or more insulating sleeves comprising an electrically non-conductive material, each defining an inner fastener channel and having an outer profile configured to extend through the first opening and the second opening, and into the disc opening;
• one or more fastener assemblies each having a longitudinal medial portion, and first and second retention portions each having a transverse dimension larger than a corresponding transverse dimension of the medial portion;
• where the first flange is configured to be coupled to the second flange with the insulating disc between the first and second flanges such that:
• the insulating sleeve extends through the first opening and the second opening, and into the disc opening;
• the fastener assembly extends through the insulating sleeve with one of the fastener insulators between the first retention portion and the first flange, and another one of the fastener insulators between the second retention portion and the second flange;
• the electrically nonconductive material(s) of each of the insulating disc, insulating sleeve(s), and fastener insulator(s) will remain solid and electrically nonconductive at temperatures up to at least 300° C. and voltages up to at least 200 Volts;
• and
• the insulating disc, insulating sleeve(s), and fastener insulators prevent the electrically conductive material of the fastener assembly from contacting either flange and prevent the flanges from contacting each other.