Abstract: A conduit for conveying a flow of a gas therethrough includes an inner wall having a first end and an opposite second end. The inner wall is disposed around, and defines a central passage extending between the first end and the second end. The central passage is structured to convey the flow of the gas therethrough between the first end and the second end. The conduit also includes an outer wall disposed about the inner wall and a sealed compartment defined between the inner wall and the outer wall, the sealed compartment being structured to house a fixed quantity of a gas therein.