what is the low temperature rating of copper pipe? 1

[tlsa98]

what is the low temperature rating of copper pipe?

 

[SnTMan]

Meaning what?

 

[btrueblood]

you might find this enlightening:

http://www.copper.org/resources/properties/cryogenic/homepage.html

Have used copper tubing for liquid nitrogen and liquid oxygen service, it worked fine...but we knew what we were using and what its predicted strength vs. applied loads was.

 

[tlsa98]

At what low temperature will it crack? I am trying to certify an oxygen pipeline. I have a low temp protection set to cut of the oxygen flow at -20f. The pipe is copper so I am wondering if -20f is suitable?

 

[tlsa98]

RE:Btrueblood, from your link, Copper and copper alloys retain a high degree of ductility and toughness at subzero temperatures. In fact, copper alloys become stronger and more ductile as the temperature goes down, retaining excellent impact resistance to 20 K (-253 C or -424 F).

So does that mean copper is good to -424f?

 

[SnTMan]

tlsa98, ASME Sec VIII, Div 1, Part UNF concerning non-ferrous materials exempts Cu alloys from impact testing to -325 F.

You should be OK at -20 F.

Regards,

Mike

 

[tlsa98]

Thank you all!!!

 

[SnTMan]

tlsa98, I might have added, if you are working to some Code or standard, you may find guidance there.

Regards,

Mike