ok, i'm not a chemical engineer, but my brother is, and we were talking about this, and i'm a bit confused as to how heat wrap could hurt pipes.... first of all, heat wrap is an insulator. That being the case, the pipe itself loses some of it's ability to dissipate heat through radiant heat transfer to atmosphere. Therefore, when the hot gas travels through the pipe, it retains more of its own heat because the thermal resistance has increased in the pipe as a whole model. This makes the inside of the pipe hotter and the exiting gas hotter, but not the air surrounding the pipe (since it's rate of heat transfer has been reduced). Now, that being said....the only thing we couldn't figure out was how this would interact with the material properties of Ti. We both thought Ti was made specifically for high temps, but we are not materials engineers, so unless there's something we don't know about commercial Ti alloys, I can't see how heat wrap would mess up Ti pipes. I think we all know about heating and cooling cycles making metals brittle, but I thought that was all rapid cooling. It will certainly make them hotter, and maybe the 'blueing' will be worse, but that's all under the wrap anyway, but other than aesthetics, I cannot see a problem. Does any of that follow?