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A bulkhead fitting assembly that includes a tube, a mounting flange attachable to a bulkhead, a thermal shell joining the mounting flange and the tube and having a portion spaced away from the tube forming an air pocket between the tube and the thermal shell, a plurality of mounting studs extending

A bulkhead fitting assembly that includes a tube, a mounting flange attachable to a bulkhead, a thermal shell joining the mounting flange and the tube and having a portion spaced away from the tube forming an air pocket between the tube and the thermal shell, a plurality of mounting studs extending from the mounting flange away from the thermal shell, and a plurality of bushings positioned between the mounting studs and the bulkhead. The plurality of bushings are each shaped to complete a current path from the tube to the plurality of mounting studs, from the plurality of mounting studs to the plurality of bushings, and from the plurality of bushings to the bulkhead. Nuts are threaded on the studs to secure the fitting assembly by sandwiching the bulkhead between the mounting flange and the bushings, which are retained by the nuts.

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1. A bulkhead fitting assembly comprising: a tube;a mounting flange attachable to a bulkhead;a thermal shell joining the mounting flange and the tube, the thermal shell having a portion spaced away from the tube to form an air pocket between the tube and the thermal shell;a plurality of mounting stu

1. A bulkhead fitting assembly comprising: a tube;a mounting flange attachable to a bulkhead;a thermal shell joining the mounting flange and the tube, the thermal shell having a portion spaced away from the tube to form an air pocket between the tube and the thermal shell;a plurality of mounting studs extending from the mounting flange away from the thermal shell, such that the plurality of mounting studs extend through corresponding openings in the bulkhead when the mounting flange is placed against the bulkhead;a plurality of bushings positioned on each mounting stud of the plurality of mounting studs, between each of the mounting studs of the plurality of mounting studs and the bulkhead to extend through the bulkhead when the mounting flange is placed against the bulkhead;a plurality of nuts received on the plurality of mounting studs to lock the fitting assembly in place by sandwiching the bulkhead between the mounting flange and the plurality of bushings, wherein the plurality of nuts is in engagement with the plurality of bushings; andwherein each bushing of the plurality of bushings contacts one of the plurality of nuts to complete a current path from the tube to the mounting flange, to the plurality of mounting studs, to the plurality of nuts, and from the plurality of bushings to the bulkhead, thereby resisting sparking from the mounting flange to the bulkhead. 2. The bulkhead fitting assembly of claim 1, wherein the air pocket is adjacent the mounting flange. 3. The bulkhead fitting assembly of claim 1, wherein each of the plurality of mounting studs is positioned to be inserted through a corresponding opening in the bulkhead. 4. The bulkhead fitting of claim 1, wherein each of the plurality of bushings is positioned to be inserted in a corresponding one of the holes in the bulkhead. 5. The bulkhead fitting of claim 1, wherein each of the plurality of bushings is inserted over a corresponding one of the mounting studs. 6. The bulkhead fitting assembly of claim 1, wherein each of the plurality of nuts is threaded onto threads of a threaded portion of each of the plurality of mounting studs that extends beyond the bulkhead. 7. The bulkhead fitting assembly of claim 1, wherein the thermal shell includes a shoulder connecting the tube to a remainder of the thermal shell, the shoulder is substantially perpendicular to the tube, and the plurality of mounting studs is oriented substantially perpendicular to the mounting flange and parallel to the tube. 8. The bulkhead fitting of claim 7, wherein the shoulder is shaped to transfer a mechanical load from the tube to the thermal shell, and to prevent the tube from bottoming out across the air pocket. 9. The bulkhead fitting assembly of claim 1, further comprising an O-ring received by the mounting flange and positioned to engage the bulkhead, thereby preventing fluid from leaking past the bulkhead. 10. The bulkhead fitting assembly of claim 9, wherein the O-ring extends about a perimeter of the mounting flange in a single piece. 11. The bulkhead fitting of claim 1, further comprising a plurality of O-rings positioned about each of the plurality of mounting studs, thereby preventing fluid from leaking past the bulkhead. 12. The bulkhead fitting assembly of claim 1, further comprising a dielectric layer positioned between the mounting flange and the bulkhead, and shaped such that sparking from the flange to the bulkhead is prevented. 13. The bulkhead fitting assembly of claim 1, wherein the bulkhead fitting assembly is included in a hydraulic conduit. 14. The bulkhead fitting assembly of claim 1, wherein the bulkhead fitting assembly is included in an electrical conduit. 15. The bulkhead fitting assembly of claim 1, wherein the bulkhead fitting assembly is made of a material with a relatively low thermal conductivity and a relatively high electrical conductivity. 16. The bulkhead fitting assembly of claim 1, wherein the tube, the thermal shell, and the flange are made of a single-piece welded part. 17. The bulkhead fitting assembly of claim 1, wherein the bulkhead fitting is made of a material selected from a titanium alloy and a corrosion-resistant steel alloy. 18. A bulkhead fitting assembly comprising: a tube;a mounting flange attachable to a bulkhead;a thermal shell joining the mounting flange and the tube, the thermal shell having a portion spaced away from the tube to form an air pocket between the tube and the thermal shell adjacent the mounting flange;a plurality of mounting studs extending from the mounting flange away from the thermal shell, the plurality of mounting studs positioned to be inserted through corresponding openings in the bulkhead when the mounting flange is placed against the bulkhead;a plurality of bushings positioned on the plurality of mounting studs between each mounting stud of the plurality of mounting studs and the bulkhead to extend through the bulkhead when the mounting flange is placed against the bulkhead; anda plurality of nuts, each nut of the plurality of nuts received on one of the mounting studs to lock the fitting assembly in place by sandwiching the bulkhead between the mounting flange and the bushings, wherein the plurality of nuts is in engagement with the plurality of bushings; andan O-ring received by the mounting flange and positioned to engage the bulkhead, thereby preventing fluid from leaking past the bulkhead. 19. The bulkhead fitting assembly of claim 18, wherein each bushing of the plurality of bushings contacts one of the plurality of nuts to complete a current path from the tube to the mounting flange, from the mounting flange to the plurality of mounting studs, from the plurality of mounting studs to the plurality of nuts, from the plurality of nuts to the plurality of bushings, and from the plurality of bushings to the bulkhead, thereby resisting sparking from the mounting flange to the bulkhead. 20. A bulkhead fitting assembly comprising: a tube having a perimeter shoulder;a mounting flange attachable to a bulkhead;a thermal shell attached to the mounting flange and to the perimeter shoulder of the tube, the thermal shell spaced away from the tube to form an air pocket between the tube and the thermal shell adjacent the mounting flange;a plurality of threaded mounting studs extending from the mounting flange away from the thermal shell, the plurality of mounting studs positioned to be inserted through corresponding openings in the bulkhead when the mounting flange is placed against the bulkhead;a plurality of bushings mounted on the plurality of mounting studs and positioned between the plurality of mounting studs and the bulkhead to extend through the bulkhead when the mounting flange is placed against the bulkhead;a plurality of nuts, wherein each of the plurality of nuts is threaded onto threads of a threaded portion of each of the plurality of mounting studs that extends beyond the bulkhead adapter to lock the fitting assembly in place by sandwiching the bulkhead between the mounting flange and the plurality of bushings, wherein the plurality of nuts is in engagement with the plurality of bushings; andwherein each of the plurality of bushings completes a current path from the tube to the mounting flange, from the mounting flange to the plurality of mounting studs, from the plurality of mounting studs to the plurality of nuts, from the plurality of nuts to the plurality of bushings, and from the plurality of bushings to the bulkhead, thereby resisting sparking from the mounting flange to the bulkhead.