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Hi Joe,
Great story. Glad you were on top of everything and made the right
decisions.
I have a similar exhaust system I think. Two short tubes into a large
can. On mine, the short tubes are 0.065 321 SS. After 5 hours of ground
running there doesn't appear to be any deterioration, but it's
definitely something to keep an eye on. Which was made more difficult
by the insulation I just added. I think I will install one of my
'J'Thermocouples on the insulation just above the exhaust system. That
temp should spike if there is any crack in the exhaust. I also have
cool air flowing thru the center of the can but so far I haven't seen
much flow because of the low speed operations. A lot of hot air flow
out after shutdown though.
Thanks for a great report. Maybe we should plan a rotary fly-in at
Hyannis, Nebraska. :) How many rooms did that hotel have?
Bob W.
On Tue, 25 Jul 2006 21:55:08 -0700
"Joe Hull" <joeh@pilgrimtech.com> wrote:
> You definitely need expansion joints. Tubes sliding within tubes, or
> some other type of flex joints.
> The thermal expansion/contraction simply kills those short runners.
> > Finn
Yep, I'm re-doing the whole exhaust system. No more inconel and no more
tangential collector. It's probably going to be 2" x .065 wall, 321
Stainless tubes going to a collector and muffler of some sort. I seriously
like the idea of non-welded joints - nothing to break off!
Joe Hull
Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA) Redmond (Seattle), Washington
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