Ok will check on the braided lines might just do em as matter of course which stainless reckons is the way to go but think I might leave the tubes from the distribution blocks to nozzles they are solid stainless tubes they aint going to burn through are they.
Thanks Fellas Oz
Oz, the distribution blocks are after the pumps and solenoids, no firesleeve requirement.
We used solid stainless lines from the blocks to nozzles on one of our motors. We had issues with the things not vibrating at the same frequency, so check regularly for cracks and leaks. Most of the event gases will leave a stain. The next one we built we used #3 stainless braid line, yes it was more expensive, but we didn't spend a lot of time on complicated bends and no issues with cracks.
There are torque specs for B nuts, be careful not to over-tighten them if you use solid line as that starts a crack. Don't build straight lines, put an expansion bend or a 90 degree bend in all of them.
Just our experience, other experiences may vary....