Charpy Specimen Chiller

[Rogue909]

Not exactly a pure metallurgy question. But I'm hoping for someones experience to lean in.

We need to test low alloy steels to -150F. Currently we pour liquid N over the specimens while submerged in a container. We'd like to switch to something more reliable. Ideally a chiller that can reach -150F without any sort of outside assistance (IE; pouring liquid N.) In the event that there isn't an off-the-shelf solution for reaching -150F on its own; I'd like to move to something that can monitor itself. IE; a self dosing liquid N system.

Does anyone have any experience putting together a system like this? Preferably a product that will do this?

 

[Compositepro]

If you are testing at minus 150 F you should have a temperature controlled chamber (oven) surrounding your test specimen in the testing apparatus. The chamber will have blower to circulate the air and a controller that sprays liquid nitrogen into the chamber to keep the specimen at the required temperature. All specimens to be tested would be pre-cooled and stored in this same chamber, until tested.

The test room requires good ventilation and probably oxygen sensors per OSHA.

https://www.google.com/search?q=mec...dAhWD7oMKHZqnA5kQsAR6BAgGEAE&biw=1426&bih=768

 

[metengr]

deja vu

thread330-436202

 

[Rogue909]

@ Metengr,

I forgot I had posted here!...

Clearly this project got back burnered. And now it came up again.

I apologize for the double for the double post. Hopefully I can come up with something this time around.

 

[Maui]

Styrofoam container with lid...dry ice...alcohol...mix and let sit...you will be able to reach a steady -120F. Do NOT insert any digits into said mixture to check temperature or you will be sorely displeased with yourself.