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Extreme Temperature Rotary Seal

Extreme Temperature Rotary Seal

(OP)
Hi all,

I am looking for a sealing solution for isolating a pressurized air cavity (75 PSI) from the outside. A shaft is to come out of the cavity and it should be sealed to prevent the air from exiting. The rotation speed and duty cycle is low (10 RPM). The temperature of the cavity is high (1200 F) and it is the restriction for using the conventional seals. Please help me on selecting a product which can handle this situation.



RE: Extreme Temperature Rotary Seal

1200 F is pretty hot for just fitting a mechanical seal, especially since your low rpm limits the effectiveness of a plan 21/23. Have you considered a gland packing solution?

RE: Extreme Temperature Rotary Seal

(OP)
Thank you for the reply.
No I have not think about that. It may seem very elementary question but it would help me a lot. can you please give me some hints on packing? Can it handle rotation or it is just for static sealing?

RE: Extreme Temperature Rotary Seal

It is possible to solve your problem by providing a double seal.
Do you have enough space oto mount a double seal.between inboard seal and vessel cavity long throat bush can be given to reduce temperature in seal area.
I suggest that please provide shaft diameter and axial space available.

RE: Extreme Temperature Rotary Seal

You can definitely use gland packing on rotating shafts (especially as slow as 10rpm). I'm not an expert, these are a decent supplier http://www.aesseal.co.uk/en/product/gland-packing. I would start by emailing them. This is more of a budget solution than the previous 2 posts, however I'm told gland packing can be a very good solution if used correctly

RE: Extreme Temperature Rotary Seal

There are seals from thermo-expanded graphite. Operating temperatures of 600 C or higher, are intended for both moving and fixed joints.
Recommend to turn to specialized companies for the production of such seals: "SGL-Polycarbon", "SIGRAFLEX", "Union Carbide"(GRAFOIL).

RE: Extreme Temperature Rotary Seal

(OP)
Thank you very much dear fellows. I will follow your hints to find the best solution.

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