Abstract: A slip collar for joining the ends of two duct section ends in an airtight, fire retardant joint which does not require an external clamping collar to provide structural strength and rigidity. A first embodiment of the collar includes concentric outer and inner walls joined by a toroidal seat attached to the inner surface of the outer wall which mates with a “U”-shaped cylindrical seat base attached to the outer surface of the inner wall. Separation between the walls determines two cylindrical slots which each closely receive an end portion of a duct section. A second embodiment, identical to the first embodiment, further includes a fluoropolymer film attached to the inner surface of the inner wall.

Abstract: An electrically self-grounding connector for joining end portions of fluid flow conduit sections, and processes for fabricating two embodiments of the connector. A connector formed according to one process includes an inner layer having electrically conductive, contiguous carbon ribbons, an outer layer with chopped carbon fibers, and a layer of surfacing veil between the inner and outer layers. A connector formed according to the other process has an inner layer of carbon cloth, an outer layer with chopped carbon fibers, and a layer of surfacing veil and putty between the inner and outer layers. In both connectors, highly electrically conductive carbon at the connector inner and outer surfaces acts to dissipate and neutralize electrostatic charges generated by triboelectric processes.

Abstract: A self-grounding laminated dual wall fume duct for transporting corrosive vapors and gases, and a process for fabricating the inner and outer walls. The innermost layer of the inner wall is made of a cured epoxy vinyl ester resin incorporating continuous carbon fibers forming a continuous surface integrated with the inner surface of the innermost layer. The electrically conductive fibers act to dissipate and neutralize electrostatic charges generated by triboelectric processes.

Abstract: An electrically self-grounding connector for joining end portions of fluid flow conduit sections, and two processes for fabricating the connector. A connector formed according to one process includes an inner layer formed by electrically conductive, contiguous carbon ribbons, an outer layer of chopped carbon fibers, and a layer of surfacing veil between the inner and outer layers. A connector formed according to the other process substitutes a layer of carbon cloth for the carbon ribbons. In both connectors, electrically conductive carbon forming the inner and outer surfaces acts to dissipate and neutralize electrostatic charges generated by triboelectric processes.

Abstract: A self-grounding laminated dual wall fume duct for transporting corrosive vapors and gases, and a process for fabricating the inner and outer walls. The innermost layer of the inner wall is made of a cured epoxy vinyl ester resin incorporating continuous carbon fibers forming a continuous surface integrated with the inner surface of the innermost layer. The electrically conductive fibers act to dissipate and neutralize electrostatic charges generated by triboelectric processes.

Abstract: A laminated inner wall of a dual wall fume duct for transporting corrosive vapors and gases, and a process for fabricating the wall. The innermost layer of the wall is made of a cured epoxy vinyl ester resin incorporating chopped carbonized carbon fibers. The electrically conductive fibers act to dissipate and neutralize electrostatic charges generated by triboelectric processes.