Kynar v. SS316 1

[MfgIntern]

Hello!

Kynar is currently listed as an "alternate material" for a SS316 piston pump and ballspring nozzle assembly.

Any thoughts why the alternate setup couldn't be used?

Trying to cover my bases before I put in for the change.

(It's not a high T process, so that shouldn't be an issue)

Thank you for your help!

~E

 

[Goahead]

The following site

http://www.ismatec.com/int_e/pumps/p_mcp_cpf_process/mcp_cpf_q2_pumpheads.htm

reports on the use of Kynar for cylinder case not for cylinder or piston. Maybe they have experience they are willing to share.
Applications certainly depend on fluid moved. Are you sure the dimensional stability of the material is within your requirements?

http://www.welding-advisers.com/

 

[MfgIntern]

Whoops - sorry, neglected to specify.

The pump would probably remain SS, but they want to implement a Kynar nozzle since the size isn't made in SS.

Thanks!

~E

 

[IRstuff]

While Kynar is chemical resistant to some degree, it does absorb moisture, albeit a very small percentage.

What's unclear is whether the material will not erode away since the pressure at the nozzle opening is presumably quite high.

TTFN

 

[MfgIntern]

OK -

So the biggest advantage to using SS is that it won't erode. Depending on the chemical composition of the commodity Kynar may or may not be applicable.

THANKS! I really appreciate the info.

~ E

 

[rorschach]

I would not say SS won't erode, but it will do so much less than Kynar. In fact eroding stainless can lead to corrosion problems if the erosion is very fast and the part is not allowed to re-establish a chrome oxide surface layer (due to low oxygen for instance). Del Oro-Stellite makes some alloys that are VERY erosion resistant. Ceramics might also be an option.