Help with Selecting Seal Type.

[GOF_fan]

I'm working on what is essentially a very large rotary union for water emulsions and oil. Pressure will be up to 800 psi and surface speed at the seal will be up to 570 ft/min (275 RPM at 7.875" diameter). Pressure and speed will frequently vary. The liquid will be filtered before passing through. There are so many sealing options and I'm having trouble determining where to focus my efforts. I'm ok with some leakage as long as I can keep my bearings clean. In similar applications I've seen throttle bushings with ~0.0015" radial clearance and drainage provisions used without any other seals. I like this idea but haven't been able to find any design resources for this technique.

Does anyone have any experience with similar sealing situations that could offer some insight?

Thank you.

 

[gyaneshwarp]

I do not have direct experience for similar application.

Only point I would like to mention is -- Please go for Stationary Seal.

 

[sreid]

A Google Image Search "Submarine Propeller Shaft Seal."

https://www.google.com/search?q=sub...cAhWR-lQKHYw2AtwQsAR6BAgGEAE&biw=1544&bih=694

 

[Hidromar]

Hi!

These pressure and speed is not very dramatic for a seal. Specially a plastic seal

Depending on finishing and misalignement, you can use a plastic seal

Later on you’ve got the possibility to use packings, but this needs to have some maintenance as far as a compression should be guaranteed during the most live of this one

Finally, and considering some leakage, you can use labirynth seals

Any of the above will be where I would focus on this situation

http://www.hidromar.es