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[How To] Renewal Dewar Vacum


Guest barbonenet
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Guest barbonenet

U r welcome;) just for confirm that the guide works properly, after a year my dewars have still perfect vacuum;)

 

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  • 8 months later...
  • 1 month later...

I saw that Drweez had / has similar dewar with a ball bearing in it. Guess i could pm him for some advice on how to get it out.

 

http://forum.hwbot.org/showthread.php?t=144929

 

Thanks for the guide.

 

Side question :)

im pretty sure if i were to drill another hole on the dewar that it would ruin it because the is some kind of material inside the vacuum chamber? Is that why i have to go in where the valve is?

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Just a tip for others. don't buy the same dewar i have ( union carbide LR-31 linde)

 

(Thank you for your inquiry but we no longer repair this type of vessel.

Success rate was 50% at best as the glue joint is the most common failure

point. Even if we were not able to perform the repair successfully you

would be liable for $125.00 as it would be necessary to weld a pump out port

on the dewar in order to leak check it.)

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I saw that Drweez had / has similar dewar with a ball bearing in it. Guess i could pm him for some advice on how to get it out.

 

http://forum.hwbot.org/showthread.php?t=144929

 

Thanks for the guide.

 

Side question :)

im pretty sure if i were to drill another hole on the dewar that it would ruin it because the is some kind of material inside the vacuum chamber? Is that why i have to go in where the valve is?

Because if u make another hole, u will have the double problem of air infiltration...u need to work with that hole....is a bit harder but u can do it

 

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  • 3 years later...

I have repaired two dewars this way and the performance is great. My valve that I use is not the most suitable one for vacuums but it still works. I recommend you use boiling water to heat the inside part of the dewar to like +80c or so for better performance.

 

 

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  • 2 months later...

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