Explosive Decompression of O-Rings
Explosive Decompression of O-Rings
(OP)
I have a client asking about the AED resistance of an O-Ring in a 4" 150" Ball Valve (client is conservative Supermajor). Everything I have ever seen on ED is that it only affects valves in high pressure gas service, and I have as a general rule only been concerned with it in valves over 600# class. I know that the o-ring cord size is also a factor, as cords less than 5mm in diameter are generally not susceptable to ED damage. I KNOW that the O-ring in the valve is OK, but how do it PROVE it. Is there a paper somewhere that states "ED is only an issue for valves in gas service above XXX psi pressure and for seals that have a cord diameter greater than Y".
Any help appreciated...
Thanks,
Andy
Any help appreciated...
Thanks,
Andy





RE: Explosive Decompression of O-Rings
http:
Mike Halloran
Pembroke Pines, FL, USA
RE: Explosive Decompression of O-Rings
David
RE: Explosive Decompression of O-Rings
To solve the problem, viton was a vast improvement over butyl-n. Next came Kalrez and a combination viton and teflon (teflon is not flexible enougn by itself.
RE: Explosive Decompression of O-Rings
http://www.hse.gov.uk/research/rrhtm/rr320.htm
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Explosive Decompression of O-Rings
The only thing they seem to have left out is the purchasing department's substitutions.
RE: Explosive Decompression of O-Rings
Many thanks. This is what I was looking for!
Pressure greater than than 35 bar, section greater than or equal to 5.35mm.
Andy