Ball valve seal material for sour gas

[SWMechanical]

Hi,

I am looking to purchase a trunnion ball valve for sour gas service at 38C, 285 psig. What would be the best seal material?

The manufacturer has a list of choices:

Viton
HNBR
EPDM
Aflas


Thanks,

 

[JLSeagull]

For sour gas, consider Aflas before ethelene propylene rubber (EPDM) or Nitrile (Buna N, HSN, HNBR). I used to keep lots of elastomer data on my hard drive but don't have it now. You can download lots of material compatibility charts from the web. Consider Kalrez when money is no object.

 

[NGiLuzzu]

SWMechanical,
maybe you'll find useful to read thread408-201095 within this Forum.

If you input your service conditions in the "Application Guides" mentioned therein, you'll probably find the more suitable polymers for your application...

Hope this helps, 'NGL