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High temperature o-ring

High temperature o-ring

High temperature o-ring

(OP)

Here's a tall order.

I wish to seal over water pipe (o.d. 15mm) with a seal that allows easy withdrawal of pipe for maintanance.  Something similar to an o-ring.  Must be able to withstand temperatures up to 500C.

Cant think of an elastic materal that can withstand such temperatures.  And I am aware water will not be liquid at such temperatures

Pressures shouldn't rise above 4 bar.

Thanks

 

RE: High temperature o-ring

500C is beyond even Kalrez (FFKM) or PTFE. Can you use a metal O-ring?

RE: High temperature o-ring

asimpson:  what you want does not exist.  You need to reconsider your design, and properly qualify what you mean by "easy removal".

RE: High temperature o-ring

Pipe unions, mean relatively easily removable.

RE: High temperature o-ring

Perhaps a packing gland or stuffing box?

RE: High temperature o-ring

If you don't mind the ferrule then you should be able to find a simple compression fitting that would work.  Take a look at Parker or Swagelok.

Dan

www.eltronresearch.com
Dan's Blog

RE: High temperature o-ring

Yeah, typical valve application, steam injection temperatures.  No such material exists in commercial application, a few under the military specification.

I've used a leaded steel or bronze alloy effectively to get a seal in Ball Valve applications.  Consider a soft metal, maybe a thermal plastic which is what is used in Check Valves.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

RE: High temperature o-ring

(OP)
Thanks for replies.  All very helpful.  

I'll have to start thinking.

RE: High temperature o-ring

Take a look at these sample access systems from Metal
Samples, linked below. You could use a similar system to resolve your problem. There are many different systems available from other suppliers.

There are 2 primary ways to accomplish what you are trying to
do.  One is to use a high temperature seal or move the primary
seal to a cooler area.  I've used both methods to achieve both  
dynamic and static  seals on steam and polymer systems.

If you decide to use the packing gland at temperature approach as mentioned above their are still some packing available that work very  well under your conditions.  These packings incorporate mica, graphite, or asbestos.  We use one that is an asbestos fiber with mica and a pinch of graphite.

If you decide to go the cool gland approach all you have to do is cool down to less than 300F.

http://www.alspi.com/access.htm

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