How to bring the temperature down for charpy impect test sample 1

[zebmahar]

Hello every one,

Please let me know is there any quick method for brining the temperature down below 0 C of carbon steel pipe specimen for Charpy Impact Test.
Hoping for the quick response

Kind Regards

 

[redpicker]

Most labs I've seen use a chilled bath (usually ethanol, but lately silicon-based fluids are popular). Chilling is typically performed with a compressor-driven refrigeration uint, but I have seen either dry ice or liquid nitrogen used to lower the temperature.

rp

 

[DiplingAndre]

Yes we do it like redpicker said.
For temperatures about -20°C we use a ethanol bath in a normal refrigiator (but takes quit long to cool it down.).
for temperatures up to -50°C we use dry ice (carbon dioxide) in combination with the ethanol bath (works quiet quick) and for temperatur up to -196°C we use liquid nitrogen bath for the speciemens.

 

[zebmahar]

Thank you very much guys for your very informative replies

Zebmahar

 

[Guest102023]

Back in the days before safety was invented we used to have a cylinder of CO2 in the lab. The rest of the procedure involved a rag, some heavy gloves, and a valve ... that's all I can tell you without putting myself at legal risk.

BTW, -196C temperature was specified for SS Charpy testing because it conveniently coincides with the boiling point of nitrogen.

 

[rustbuster]

LOL Brimstoner. Not many of us left, the ones that are were lucky in some cases.

 

[redpicker]

Even luckier if you still have all your fingers (attached to your hand, not stored in a jar on the shelf).

rp