10/30/2022 0 Comments Shroud defineThis involves removing the ducts as well, because the attachment of the titanium shrouds to the titanium ducts is too difficult to be done in the field, so that the ducts and the shrouds have to be sent to the manufacturers to be refinished. However, when the shrouds become too corroded to protect the ducts, they have to be removed. They do protect the ducts and increase their useful worklife somewhat. These shrouds are themselves subject to attack by Skydral and, in addition, they are costly and increase the weight of the aircraft. The ducts are generally covered by titanium shrouds for protection against corrosion. Consequently, the ducts have to be examined very frequently to make certain they are in a safe condition. Since aircraft have very many hydraulic ducts, leakage in these ducts, which is almost always present, permits drops of the Skydral to fall on and eat away the aircraft ducts, causing leakage in the ducts and danger to the aircraft. However, it does react with and corrode titanium. Skydral is a hydraulic fluid widely used in aircraft because of its many desirable physical properties. However, titanium is very expensive and, in addition, it can be attacked and corroded by exposure to Skydral. This invention relates to a protective shroud for ducts used in aircraft.ĭucts installed in modern aircraft are formed from titanium because it is strong and light. The shroud described in claim 1 wherein the spacer member is slotted, said slot in said spacer member aligned with the slot in said tube so that the edges of the entire slot with the spacer member attached thereto can be separated for easy insertion or removal of the shroud from a duct. The shroud described in claim 1 including a longitudinally extending mounting flange mounted on said shroud along the length of said slot adjacent one edge of the slot, a pocket flange attached to said mounting flange, said pocket flange in radially outwardly spaced relation to the mounting flange and extending along the length of said slot adjacent said one edge of the slot defining thereby an edge receiving pocket, the opposite edge of said slot mounted in said pocket to provide a gas-tight closure for the slot in said shroud and to maintain the diamter of the shroud constant.Ĥ. The shroud described in claim wherein the inner surface of the shroud is coated with a fire resistant aluminum material to reduce the temperature of the shroud, and wherein the surface of the shroud is provided with a rigidizing waffle pattern formed therein for strength.ģ. A shroud for a duct comprising a generally cylindrical resilient tube formed from an organic aramid fiber, said tube having an axially extending slot along its entire length whereby adjacent edges of the tube by the slot can be pulled apart so the tube can be inserted over a duct, at least one radially inwardly extending clamping band receiving groove situated transverse to the axis of said tube, said groove including a base which is radially inwardly spaced from the circumferential periphery of said cylindrical tube, said base adapted to receive a clamping band whereby the cylindrical shroud can be clamped to a duct mounted therein, a generally cylindrical spacer member formed from a selected elastomeric material mounted on the inner surface of said base member so the clamping band can clamp the shroud to said duct, said spacer member including a plurality of angularly spaced inwardly projecting abutments adapted to engage the peripheral surface of a duct defining thereby an insulating air gap between said shroud and the surface of said duct, the space between said angularly spaced inwardly projecting abutments defining channels through said spacer member for the passage of gases along the length of the air gap.Ģ. Having shown and described the invention, whatġ.
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