|
Purging
Jul 1, 2012 20:01:08 GMT -7
Post by mud on Jul 1, 2012 20:01:08 GMT -7
I usually freeze mine prior to storing for about a week.
|
|
|
Purging
Jul 1, 2012 21:34:02 GMT -7
Post by Cwi555 on Jul 1, 2012 21:34:02 GMT -7
Why did I use CO2 instead of N2? First and foremost, it was because I had easy access to a tank of CO2! On top of that, the blend of gasses that comprise "air," at about 70 degrees F has a density of about 1.2 Kg/m3; whereas, pure CO2 (ignoring the advantageous fact that it cools and hence increases in density as it exits its pressure tank) at 70 degrees F has a density of about 1.8 Kg/m3. Being more dense (especially when cooler), the CO2 displaces the "air." It's important tpo feed the CO2 SLOWLY into the bottom of the bucket! The visual effect is like a shimmery mirage when the CO2 spills over the top of the bucket. With a few friends, we sea;ed up about 40, 5-gallon buckets of wheat berries, purged with CO2 in this manner. 15 years latewr, the wheat seemed perfectly fine...NO BUGS! N2 might be better and easier (denser); but, the CO2 seemed to work just fine! Thanks for the info. Nitrogen btw is not usually denser than air, but which measurement of density you use does matter. NTP (normal temperature pressure) is defined as air at 20 C (293.15 K, 68F) and 1 atm STP (standard temperature pressure) is defined as air at 0C (273.15 K, 32F) and 1 atm I always load nitrogen at STP when the atmosphere is at or above NTP temps. This creates a positive pressure atmosphere in the bags/buckets after the temperatures reach equilibrium. The size of the nitrogen atom is larger than that of an oxygen atom as well which helps keep out the oxygen and standard atmospheric mix. I will have to look into Co2 though. It would certainly be easier if it was more beneficial.
|
|
|
Purging
Jul 1, 2012 22:32:35 GMT -7
Post by USCGME2 on Jul 1, 2012 22:32:35 GMT -7
Questions: 1) When you bucket sugar, salt, or pwder milk, do you want to purge that too or is there a different method for those items? 2)Im putting both a dessicant pack and an O2 thingy in them. The two are compatable together correct? Thanks for all the info already ya'll, I think I must've slept thru chem class in HS . I do have some mylar liners and O2 absorbers on order today. ;D
|
|
|
Purging
Jul 1, 2012 22:59:46 GMT -7
Post by Cwi555 on Jul 1, 2012 22:59:46 GMT -7
Questions: 1) When you bucket sugar, salt, or pwder milk, do you want to purge that too or is there a different method for those items? 2)Im putting both a dessicant pack and an O2 thingy in them. The two are compatable together correct? Thanks for all the info already ya'll, I think I must've slept thru chem class in HS . I do have some mylar liners and O2 absorbers on order today. ;D neither sugar nor salt have a problem with oxygen. What they do have a problem with is moister. Powdered milk does have a problem with oxygen and moister both. As a matter of course, I don't purge either sugar or salt. I use dessicant for those only. For the powdered milk, we purge.
|
|
|
Post by geron on Jul 2, 2012 4:07:11 GMT -7
Questions: 1) When you bucket sugar, salt, or pwder milk, do you want to purge that too or is there a different method for those items? 2)Im putting both a dessicant pack and an O2 thingy in them. The two are compatable together correct? Thanks for all the info already ya'll, I think I must've slept thru chem class in HS . I do have some mylar liners and O2 absorbers on order today. ;D Question #2 (Copied from USA Survival Supplies LLC) -- If absorbers are sealed in a package with desiccants some thought should be given to just how low the relative humidity will be dropped. Silica gel will reduce humidity to approximately 40% which should not interfere with the absorbers oxidation reaction. Other desiccants, however, are capable of reducing relative humidity to very low levels. This might adversely affect your absorber's ability to carry out its mission by removing moisture from the absorber package that is necessary to sustain the oxidation reaction. If you do use desiccants and oxygen absorbers in the same package, place the desiccant on the bottom, fill the package and then place the oxygen absorber on top of the food just before sealing.
|
|
|
Post by USCGME2 on Jul 2, 2012 7:46:01 GMT -7
Thank you both G & CWI.
|
|
|
Purging
Aug 14, 2012 22:25:41 GMT -7
Post by missj on Aug 14, 2012 22:25:41 GMT -7
I just use O2 absorbers and mylar bags inside of plastic buckets.
|
|