A method to dissipate heat build-up in a structural component is disclosed. In one embodiment, the structural component is a composite pipe for carrying a hot fluid, e.g., petroleum products. The method comprises providing a protective sheath disposed around the structural component and forming an air space between the structural component and the sheath. The sheath has at least two gaps on its surface, with the gaps being sufficiently spaced apart to allow air flowing through the air space from one gap to another to dissipate heat build-up from the hot fluid contained within the structural component. In one embodiment, an intumescent material is applied near the gaps, which material expands when heated to a temperature in a fire to effectively close the gaps and protect the structural component from the fire.