Best I can tell from the pictures, I notice the outer pipe is gold colored, indicating the inner pipe must have gotten pretty pretty hot. Gold color OK, extensive areas of 'blued' metal, however, indicates tempering (softening), i.e., the pipe has lost its stiffness. If that's the case re the inner pipe, it becomes subject to collapse at full thrust (Bernoulli effect). If the blued portions can be permanently deformed easily (dented), then that pipe should be replaced.

Just curious Jetflash: you mention you live in the Boston area....'Cape Code'. You mean Cape Cod? That's where I'm from and the only turbine guy around, to my knowledge. Where do you fly? And absolutely nothing wrong (and much to be gained!) in using properly installed (tubing ends square, pushed fully in) Festo products on the suction side. I prefer a ball valve there, to on the pressure side, where mine are straight runs from pump to turbine. Festo products are actually manufactured for pneumatic uses, pressure and suction, but it's certainly been proven worldwide over the past fifteen years that they are fully reliable in our installations!

Ray<br type="_moz" />