An electrically isolating duct-connecting block for connecting two ducts, the duct-connecting block including a rigid, generally rectangular duct-like structure having upper and lower walls and side walls that match a cross-sectional size of a tie duct, the structure being made of an electrically nonconductive material. The block also includes a plurality of threaded fasteners embedded within the structure. Also disclosed is an electrically isolating nozzle-mounting block for mounting a nozzle to a tie duct, the nozzle-mounting block comprising a rigid flange-like structure having peripheral mounting holes and a central circular passage for conveying air to the nozzle, the structure being made of an electrically nonconductive material. The block also includes a plurality of threaded fasteners partially embedded within the structure. The blocks may be made of ultrahigh molecular weight polyethylene or any electrically and mechanically equivalent material.

An electrically isolating gasket is disclosed wherein a coating layer is disposed on at least one conductive surface, and in some embodiments, on all surfaces or at least all of the conductive surfaces. The electrically isolating gasket includes a core gasket component, a ring seal component, and a non-conductive inner seal component. The coating layer can be, for example, polyimide, polyamide, ceramic, and aluminum oxide.

A gasket having concentric or spiral serrations around the aperture on each side of the gasket, and wherein a facing is secured to such serrations, wherein each facing comprises a first layer which is in contact with a respective set of such serrations and a second layer which is in contact with the first layer. The first layer could be of a polyaryletherketone or polyimide, and the second layer could be of graphite or vermiculite. The serrations are designed to avoid damage to the first layer. An intact first layer can supply a property to the facing which may be absent in the second layer; for example, good dielectric properties.

A plug-in coupling has a coupling plug and a coupling socket. The coupling plug has an inner and an outer pipe piece and a first attachment flange and is connected to the first cryogenic line. The coupling socket has an inner and an outer pipe piece and a second attachment flange and is connected to the second cryogenic line. A circular annular seal on the distal end of the coupling plug is of electrically insulating form. An insulating sleeve is arranged on the outer pipe piece of the coupling plug. An insulating disc is situated between the first and the second attachment flange when the coupling plug has been inserted into the coupling socket. The plug-in coupling realizes a galvanic is separation between the coupling plug and the coupling socket.

Gasket seals for high pressure applications include retaining elements with inner diameter seal elements that interlock with the retaining element to provide resistance to movement in both axial and radial directions between the retaining element and seal element. High pressure sealing may be accomplished using a metallic core retaining element to which an electrically isolating material is bonded on either or both sides. Sealing is achieved through an inner diameter dielectric sealing element, such as a polytetrafluoroethylene (PTFE) inner diameter sealing ring. Flanges of a joint in a fluid flow ling may be bolted together with the gasket seal interposed therebetween. In the event of pressure changes, the inner diameter seal resists being drawn into the flow line, and resists axial movement relative to the retaining element, through dual locking members that secure the seal to the retaining element.

The present disclosure provides a pipe coupling that includes a coupling body, a first pack joint nut, and first and second sleeves. The coupling body is made of a first metal material and the first pack joint nut is made of a second metal material. The first pack joint nut is configured to receive a portion of a first pipe. The pipe is made of a dissimilar metal material to the first and second metal materials of the coupling body and the first pack joint nut, respectively. The first sleeve is configured to line at least a portion of an inner periphery of the coupling body. The second sleeve is configured to line at least a portion of an inner periphery of the first pack joint nut. The first and second sleeves are made of non-metallic materials, and serve as physical non-metallic barriers between the first/second metal materials of the coupling/first pack joint nut, and the dissimilar metal material of the first pipe.

A non-metallic flange isolation gasket kit sealing flanged pipeline connections and flanged vessel connections while providing electrical isolation protection between flanges suited for high-pressure and high-temperature cathodic protection applications is presented. The invention protects flange faces from media induced corrosion and mitigates flange rotation induced fatigue and failures. The invention comprises of a retainer, a seal, and a seal pre-load structural ring. The seal pre-load structural ring is inserted into the seal, and seal outer diameter surface is joined to the retainer inner diameter surface. A second embodiment comprises of a composite gasket blank, comprising of a retainer and a seal, and a seal pre-load structural ring. The seal outer diameter surface and the retainer inner diameter surface are joined by thermal fusion bonding. The invention may further comprise one or more gasket seating stress stabilizers and/or a centering ring. Tapered retainer upper and lower surfaces decrease flange rotation.

According to an embodiment, an aircraft comprises a fuselage including composite skin; an enclosure located inside the fuselage; a rechargeable battery disposed inside the enclosure; and a ventilation conduit extending from the enclosure to an opening in the composite skin, the ventilation conduit including: a first portion having a first end coupled to the enclosure and a second end spaced from the composite skin, and a second portion extending between the composite skin and the second end of the first portion, the second portion comprising an electrically non-conductive material.

A coupling body having an opening and configured to receive a pipe in the opening. The coupling body is made of a metal material and the pipe is made of a different metal material to the metal material of the coupling body. An insulating sleeve lines at least a portion of an inner periphery of the coupling body adjacent the opening. The insulating sleeve is made of non-metallic material and is configured to serve as a physical non-metallic barrier between the metal material of the coupling and the different metal material of the pipe so the different metal material of the pipe does not contact the metallic material of the coupling body.

An electrically isolating gasket is disclosed wherein a coating layer is disposed on at least one conductive surface, and in some embodiments, on all surfaces or at least all of the conductive surfaces. The electrically isolating gasket includes a core gasket component, a ring seal component, and a non-conductive inner seal component. The coating layer can be, for example, polyimide, polyamide, ceramic, and aluminum oxide.