Corrosion Allowance and Elastomers
Corrosion Allowance and Elastomers
(OP)
Can someone please advise the following:
- Is a CS body valve with 10mm corrosion allowance readily available for all pressure classes or if they need to be specially manufacturered? Or is the 10m corrosion allowance OTT (over the top)??
- The following valve elastomers specifications, are they correct w.r.t. to the application temperature limitations:
a.PTFE shall be limited to 230 deg C, Viton A to 200 deg C, Buna N to 120 deg C and Neoprene to 90 deg C
Thanks.
- Is a CS body valve with 10mm corrosion allowance readily available for all pressure classes or if they need to be specially manufacturered? Or is the 10m corrosion allowance OTT (over the top)??
- The following valve elastomers specifications, are they correct w.r.t. to the application temperature limitations:
a.PTFE shall be limited to 230 deg C, Viton A to 200 deg C, Buna N to 120 deg C and Neoprene to 90 deg C
Thanks.





RE: Corrosion Allowance and Elastomers
As for seals, take a look at:
http://
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Corrosion Allowance and Elastomers
O-ring information: http://www.marcorubber.com/compatibility.htm
Material Web: http://www.matweb.com
The temperatures you listed look to be about right for those elastomers. Viton can get really hot for a short period of time.
RE: Corrosion Allowance and Elastomers
Then be sure the valve rating covers your press/temp application.