Abstract: A mid-turbine frame for a gas turbine engine may comprise a bearing system including a bearing housing. A first tube may define a first fluid passage configured to carry a first fluid to the bearing system. An outer sleeve may be disposed around the first tube and may define a chamber between the first tube and the outer sleeve. A first fitting may be coupled to the first tube and to the outer sleeve. The first fitting may comprise an inner portion having an inner surface further defining the first fluid passage. An outer portion may be disposed around the inner portion and may further define the chamber therebetween. The chamber may be configured to contain a fluid. An outer surface may have a first mating surface comprising a frustoconical shape. A flange may extend radially outward from the outer surface.

Abstract: A fitting for a double wall tube may comprise an inner portion defining an inner fluid passage. An outer portion may be disposed concentrically around the inner portion and may define an outer fluid passage between the outer portion and the inner portion. The outer portion may define a first aperture disposed through a sidewall of the outer portion.

Abstract: A tubing assembly for fluid delivery to a bearing system may comprise a fitting having an inner surface defining an inner flow path and having an outer surface defining a first mating surface. A first tube may be coupled to the fitting. The fitting may be disposed within a bearing housing of the bearing system. The bearing housing may include a second mating surface in sealing contact with the first mating surface of the fitting.

Abstract: A multiwall tubing assembly for fluid delivery to a bearing system may comprise a first tube defining an inner fluid passage configured to carry a first fluid. A second tube may be disposed around the first tube and may define an outer fluid passage between the first tube and the second tube. The outer fluid passage may be configured to carry a second fluid. A fitting may be coupled to the first tube and the second tube. The fitting may comprise an inner portion fluidly coupled to the inner fluid passage and configured to carry the first fluid. An outer portion may be disposed around the inner portion and fluidly coupled to the outer fluid passage. The outer portion may be configured to carry the second fluid. The fitting may be configured to fluidly isolate the first fluid from the second fluid.

Abstract: A tubing assembly for fluid delivery to a bearing system may comprise a fitting having an inner surface defining an inner flow path and having an outer surface defining a first mating surface. A first tube may be coupled to the fitting. The fitting may be disposed within a bearing housing of the bearing system. The bearing housing may include a second mating surface in sealing contact with the first mating surface of the fitting.

Abstract: A mid-turbine frame for a gas turbine engine may comprise a bearing system including a bearing housing. A first tube may define a first fluid passage configured to carry a first fluid to the bearing system. An outer sleeve may be disposed around the first tube and may define a chamber between the first tube and the outer sleeve. A first fitting may be coupled to the first tube and to the outer sleeve. The first fitting may comprise an inner portion having an inner surface further defining the first fluid passage. An outer portion may be disposed around the inner portion and may further define the chamber therebetween. The chamber may be configured to contain a fluid. An outer surface may have a first mating surface comprising a frustoconical shape. A flange may extend radially outward from the outer surface.

Abstract: A multiwall tubing assembly for fluid delivery to a bearing system may comprise a first tube defining an inner fluid passage configured to carry a first fluid. A second tube may be disposed around the first tube and may define an outer fluid passage between the first tube and the second tube. The outer fluid passage may be configured to carry a second fluid. A fitting may be coupled to the first tube and the second tube. The fitting may comprise an inner portion fluidly coupled to the inner fluid passage and configured to carry the first fluid. An outer portion may be disposed around the inner portion and fluidly coupled to the outer fluid passage. The outer portion may be configured to carry the second fluid. The fitting may be configured to fluidly isolate the first fluid from the second fluid.

Abstract: A fitting for a double wall tube may comprise an inner portion defining an inner fluid passage. An outer portion may be disposed concentrically around the inner portion and may define an outer fluid passage between the outer portion and the inner portion. The outer portion may define a first aperture disposed through a sidewall of the outer portion.