And do not build a container that cannot release the pressure created as the CO2 (dry ice)evaporates. As it turns to gas it is just like liquid propane, creating a certain vapour pressure the same as a CO2 cartridge at room temperature.
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And do not build a container that cannot release the pressure created as the CO2 (dry ice)evaporates. As it turns to gas it is just like liquid propane, creating a certain vapour pressure the same as a CO2 cartridge at room temperature.
Good point, a latched lid could be hard for the pressure to lift.Quote:
Originally Posted by patvetzal
Not that much of a problem with a home built box or chest freezer lid..Pressure will lift the lid, and "burp" the box..pressure stays way below the danger level. The pressure will lift a heavy lid long before it blows out the sides.
I've gotten bags of pellets from here http://www.praxair.ca/en on Startop Road.Quote:
Originally Posted by greatwhite
Have used dry ice to transport frozen meat etc into remote camps for years, would purchase the ice on Saturday morning, lay across the bottom of a large cooler then pack already frozen steaks and whatever else we wanted on top, the larger the pieces of dry ice the longer they will last, we've pulled still frozen chops out of cooler on Thursday morning, seems this is the absolute limit on time for dry ice to survive, we've had shorter time periods too so I'd say you can count on 4 days total. This is with slabs approx 6x6x3 inches thick. Dry ice evaporates so anything you can do to slow down air exchange extends the shelf life, it needs to be able to vent the gas it generates but the seal around a normal cooler will allow for that, don't air tight the container, do not buy pellets, have them cut it for you with band saw. I usually lay a thin layer of styrofoam or something similar in the bottom of the cooler before putting in the dry ice, dry ice runs at about -80, if it lays in direct contact with the bottom of your cooler and you bang that cooler hard enough it will shatter. I buy mine from Praxair but would imagine any welding supply center would have this. Make sure cooler is in a well ventilated area, Snowwalker is right about the CO2, you do not want to breath the gas coming off this product. Hope this helps.
And don't transport it within the confines of your vehicle. Not in the passenger cab or even the trunk.
Freeze 5 gallon water jugs solid, in a large insulated space they keep cold for some time.
I use a two liter pop bottle in a collapsible cooler to keep my lunch fresh and safe in my day pack. It keeps for a day or two depending on the weather. Nice thing is that I also have a cool drink of water(SAFE) to refill my water bottle for sipping as I hike/hunt/fish. You can always get cool/cold water to refill water bottles from a creek/river/lake( Filtered of course), but where can you find water to drink on a hill top.Quote:
Originally Posted by Monster29/66
Praxair and Air Liquide both carry dry ice , some locations may not stock it but can bring it in , pelletes don't last as long as blocks.
The dry ice is -112 F. so anything it touches will be frozzen
Quote:
Originally Posted by alfoldivandor
I have my cooler ready 90% and used it on bear hunt 60 kg of ice in jugs 4.5 in isolation +1 c lasted for 8 days . did not get a bear, but used to store blueberries and food for a week.
In the future I will add some dry ice to , hoping will last longer
Get my dry ice at Praxair, they will cut you whatever dimension you want off larger slabs. Since dry ice is so cold (-78C) don't lay it right on the bottom of a cooler or other plastic surface, one bang and it can shatter your cooler. Its not so much heat that makes dry ice decline, its evaporation, more air flow, shorter life. So, as mentioned above, wrap dry ice in newspaper, lay on layer of high density foam in bottom of whatever you decide to use as a cooler, layer of cardboard on top (do not let your meat come in contact with something thats -78C, it will burn it), pack your cooler with whatever you intend to freeze, if possible, another layer of high density foam on top, close and seal cooler. Open as seldom as possible. I've done this going into the bush so we could have steaks etc all week long, have pulled rock hard pork chops out of the cooler on day 6. That was using cheap big blue Walmart cooler with above packing method. Snowwalker is bang on, dry ice is dangerous of you don't respect it, keep it in a well ventilated area, don't put it inside your vehicle etc, as it evaporates it bleeds CO2, this can kill you, do not handle with bare hands. Do throw a chunk in the edge of the lake in about 6 inches of water and wave your lighter over your head, very cool.