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post #111 of 128 (permalink) Old 04-08-2013, 04:46 AM - Thread Starter
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Hey stubass,it may pay to ask vince KP or some of the other guys in here about sealing the two piece pot,whats the best thing to use because I can only advice you on LN2 because ive never used anything els other then LN2 in the pot.With Ln2 it freezes pretty quick and would seal up everything anyway and the tape is just a precaution.Im a bit unsure about other liquids
Looking forward to some pics and results from you,biggrin.gif

hey Bullant, yep what you said, blue painters tape is what i have heard thumb.gif hey also i am trying so hard to find a dewar constantly searching but there seems to be different types from what i can see that i am not sure what type to look for... say used on eBay.. any advice?


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post #112 of 128 (permalink) Old 04-08-2013, 04:47 AM - Thread Starter
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yeah but is it still sticky at -150 ?
i was thinking it wouldn't because of dilatation and viscosity.

good question thinking.gif


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post #113 of 128 (permalink) Old 04-08-2013, 04:47 AM
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if the insulation is broken it will be worthless , i would be carefull where to buy a second hand dewar , that is why i was suggesting the supplier which have no reason to provide you with a faulty dewar.

maybe the tape just freeze and help to held it together .

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post #114 of 128 (permalink) Old 04-08-2013, 04:49 AM - Thread Starter
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if the insulation is broken it will be worthless , i would be carefull where to buy a second hand dewar , that is why i was suggesting the supplier which have no reason to provide you with a faulty dewar.

maybe the tape just freeze and help to held it together .

gotya smile.gif


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post #115 of 128 (permalink) Old 04-08-2013, 06:24 AM
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yeah but is it still sticky at -150 ?
i was thinking it wouldn't because of dilatation and viscosity.
Ive had no problems at all with it but this is something you will have to test it your self or look around find something that you may think is sticker,get more feed back.I use and try what works for me,in anything tho if person doesn't apply correctly then best tape in the world is no good
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post #116 of 128 (permalink) Old 04-08-2013, 06:28 AM
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i wasn't suggesting what you said was wrong i m just surprised

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post #117 of 128 (permalink) Old 04-08-2013, 07:01 AM
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hey Bullant, yep what you said, blue painters tape is what i have heard thumb.gif hey also i am trying so hard to find a dewar constantly searching but there seems to be different types from what i can see that i am not sure what type to look for... say used on eBay.. any advice?
Im not sure about type but when buying a secondhand Dewar it would pay to buy something not too old,smaller dewars make sure the seal plug is in good condition. The other thing is what i did was ask the seller to do a evaporation test on the Dewar to see if the still hold good,will cost you little bit for the cost of LN2 if they are willing to do it.Here is a example find a Dewar you like if its not too old do a search on it Google see what its evaporation holding time is like.From memory you want to pick Dewar with say 0.50 or less,thats 500mls(less the better) a day you will loose on evaporation.The better Dewar I think loose about 0.20 ish a day and normally cost more money,The Dewars that are past their time may loose litres a day,a Dewar that sweats when it has LN2 is past it and has bad vacuum.
Here is a some examples good Dewar, 3 different second had prices and on the bottom link the holding time that is good 0.27 that is good when new,Normally the bigger the dewar the bigger the evaporation time

URL=http://www.ebay.com.au/itm/Taylor-Wharton-35VHC-Liquid-Nitrogen-Dewar-Tank-/300843667351?pt=LH_DefaultDomain_0&hash=item460bae0f97]http://www.ebay.com.au/itm/Taylor-Wharton-35VHC-Liquid-Nitrogen-Dewar-Tank-/300843667351?pt=LH_DefaultDomain_0&hash=item460bae0f97[/URL]

http://www.ebay.com/itm/Taylor-Wharton-35VHC-liquid-nitrogen-dewar-/140938832449?pt=LH_DefaultDomain_0&hash=item20d09bea41


http://www.ebay.com/itm/Taylor-Wharton-35VHC-liquid-nitrogen-dewar-/140938841395?pt=LH_DefaultDomain_0&hash=item20d09c0d33


http://www.taylorwharton.com/assets/base/doc/products/refrigerators/TW-27_HC_Series_%28Original_Version%29.pdf
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post #118 of 128 (permalink) Old 04-08-2013, 07:08 AM
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edited the other link just now^^^^
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post #119 of 128 (permalink) Old 04-08-2013, 07:31 AM
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i wasn't suggesting what you said was wrong i m just surprised
It's understandable
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post #120 of 128 (permalink) Old 04-08-2013, 02:21 PM - Thread Starter
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hey Bullant, yep what you said, blue painters tape is what i have heard thumb.gif hey also i am trying so hard to find a dewar constantly searching but there seems to be different types from what i can see that i am not sure what type to look for... say used on eBay.. any advice?
Im not sure about type but when buying a secondhand Dewar it would pay to buy something not too old,smaller dewars make sure the seal plug is in good condition. The other thing is what i did was ask the seller to do a evaporation test on the Dewar to see if the still hold good,will cost you little bit for the cost of LN2 if they are willing to do it.Here is a example find a Dewar you like if its not too old do a search on it Google see what its evaporation holding time is like.From memory you want to pick Dewar with say 0.50 or less,thats 500mls(less the better) a day you will loose on evaporation.The better Dewar I think loose about 0.20 ish a day and normally cost more money,The Dewars that are past their time may loose litres a day,a Dewar that sweats when it has LN2 is past it and has bad vacuum.
Here is a some examples good Dewar, 3 different second had prices and on the bottom link the holding time that is good 0.27 that is good when new,Normally the bigger the dewar the bigger the evaporation time

URL=http://www.ebay.com.au/itm/Taylor-Wharton-35VHC-Liquid-Nitrogen-Dewar-Tank-/300843667351?pt=LH_DefaultDomain_0&hash=item460bae0f97]http://www.ebay.com.au/itm/Taylor-Wharton-35VHC-Liquid-Nitrogen-Dewar-Tank-/300843667351?pt=LH_DefaultDomain_0&hash=item460bae0f97[/URL]

http://www.ebay.com/itm/Taylor-Wharton-35VHC-liquid-nitrogen-dewar-/140938832449?pt=LH_DefaultDomain_0&hash=item20d09bea41


http://www.ebay.com/itm/Taylor-Wharton-35VHC-liquid-nitrogen-dewar-/140938841395?pt=LH_DefaultDomain_0&hash=item20d09c0d33


http://www.taylorwharton.com/assets/base/doc/products/refrigerators/TW-27_HC_Series_%28Original_Version%29.pdf

thanks again for all the info, gives me an idea what to look for but first i will do what Ashuiegi said and check with suppliers here.
PS as always somethings confused me as to type or if they are the same.. like one may say Ln2 dewar while one might say Ln2 cryogenics dewar (kinda like what my dad's friend uses on his cattle farm for bull sperm)


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