Rotating Connection to 700 Deg F Pipe
Rotating Connection to 700 Deg F Pipe
(OP)
I have a fixed 1 1/8" O.D. pipe which ranges in temp from ambient to a peak of 700 Deg F.
I need to attach a component to the pipe which must be thermally isolated from the pipe and can freely rotate about the pipe, like a wheel about an axle.
Is there a high temp, thermally non conduction bushing or bearing which can be used. Price is an issue and cheap and simple is the primary concern.
The rotation is not precise, just needs to be free to rotate.
Any ideas are welcome. I found a ceramic bushing, but was blown away by the price. Also not sure that ceramic would handle the expansion and contraction of the pipe from ambient to 700.
I need to attach a component to the pipe which must be thermally isolated from the pipe and can freely rotate about the pipe, like a wheel about an axle.
Is there a high temp, thermally non conduction bushing or bearing which can be used. Price is an issue and cheap and simple is the primary concern.
The rotation is not precise, just needs to be free to rotate.
Any ideas are welcome. I found a ceramic bushing, but was blown away by the price. Also not sure that ceramic would handle the expansion and contraction of the pipe from ambient to 700.





RE: Rotating Connection to 700 Deg F Pipe
RE: Rotating Connection to 700 Deg F Pipe
A very short list:
Can you stand any heat transfer?
Load and RPM of the thingy?
RE: Rotating Connection to 700 Deg F Pipe
Check out Chiksan connections as used in the oil drilling industry. Pressures up to 10k psi, Not sure about temperature limit as it would depend on the type of seal fitted.
Offshore Engineering&Design
RE: Rotating Connection to 700 Deg F Pipe
There are no other constraints and it should not be difficult.
Chief,
Pressure has nothing to do with this problem. The pressure within the pipe is irrelevant.
Component is attached about the pipe and is balanced like a wheel about an axle. Pipe is copper.
The pipe is very hot and I want to make a fixed connection to it which will allow for rotation about the pipe, without transferring heat from the pipe past the connection point. If there is a simple solution, I am all eyes.
Radial Load is < 50 lbs and max rpm is 10 rev / min. The pipe is horizontal to the ground, so there is no lateral or thrust force on the connection.
RE: Rotating Connection to 700 Deg F Pipe
http://www.dryerbearings.com/index.html
http://micasales.com/#mica_products
Another way might be to use ceramic or carbon foam as a bushing.
http://www.ultramet.com/refractoryopencells.html
http://www.ergaerospace.com/index.htm
http://ww
Even another way might be is to use a packing gland and use Graphite, glass, or ceramic packing. Your project would be a no brainer if one could still use Asbestos.
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http://www.minseal.com/
Yet another way would be to use a packing gland arrangement and use something like LPS to mold a bushing over thing metal sleeve.
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RE: Rotating Connection to 700 Deg F Pipe
The dryer bearings look like just the thing, but will also consider lathe turning our own bushings from a high temp bonding cement as avail at unifrax.com
In our initial plan, we just assumed there would be very inexpensive high temp bushings made from ceramic, widely available. I have not found this to be the case.
Regards,
Triage
RE: Rotating Connection to 700 Deg F Pipe
http://www.crystexcomposites.com/new/index.ph
http://www.aremco.com/a1.html
RE: Rotating Connection to 700 Deg F Pipe
Copper is not a suitable material for this 700F application, as per the rules of ASME B31.1.
I suggest one of the stainless steels...
-MJC
RE: Rotating Connection to 700 Deg F Pipe
Thanks for the advice, this is not a power application and hence is not subject to ASME B31.1, but I agree that copper pipe is not applicable for this application if it were operating under pressure. It's just hot, and well below its melting point.
BTW, found an afordable graphite bushing for the job, thanks for all of the contributions.