[Push It]

Consider each one has to be 3x bigger to give the same amount of gas as CO2. And I do not know any one that refills them, for me N2 has always been a leased cast iron cylinder swapped in for a filled one.

I looked into the aluminum tanks a few years ago. I would of had to buy the tank and they would have to send it out to be refilled. So I would of had to buy several tanks. They were pretty costly. I just ended up buying a 100' hose.

 

[jpsmith1cm]

Let's try this idea on for size.

Throw a controversial bone into the mix, here.


Would it be better to use CO2 as a purge gas or simply NOT to use a purge gas?


I really don't see the moisture issue as a big one myself. Given proper evacuation and other proper service practices

 

[itsiceman]

Wish I had the equipment to test.
If the releasing of moisture from POE is from a lack of nucleation like I suspect and CO2 releases like any other refrigerant it would probably help dehydrate with vacuum.

 

[Osofrio]

Let's try this idea on for size.

Throw a controversial bone into the mix, here.


Would it be better to use CO2 as a purge gas or simply NOT to use a purge gas?


I really don't see the moisture issue as a big one myself. Given proper evacuation and other proper service practices

I would almost have to agree here, given life in the field, and if a choice between no purge and some CO2, I might go for the CO2.

When I heat up the pipe, well, I don't think moisture is really an issue until I get below the current dew point, and as has been noted, the purpose of a vacuum pump is...well, I guess we know how to read a micron gauge, right? I just have spent an entire career learning not to put, or get near to put, anything that could potentially maybe likely might cause an issue...There's that OCD thing showing up again.

Proper practices make up for bad days, and if you keep to proper practices in all other aspects, there should be enough wiggle room for anything "non-critical". I won't take any chances with the chiller for the ER operating room, or a large Data Room unit, cascade systems or stuff like that. In our world, especially in the residential world, there actually is a lot of wiggle room, especially if you keep to safe practices. In the Residential world, if you even know what a micron is, then you are way ahead of the pack!

I will still use nitrogen, simply because I'm an old dog, and it is easier for me to know what I have, so I can make the warranty to the customer's lawyers. And if any lawyer ever asks, the term "proper practices" has special meaning in a court of law. What that meaning is, is why lawyers get $300.00 per hour!

 

[shellkamp]

I think we all just got served ^^

Sent from my DROID BIONIC using Tapatalk

 

[itsiceman]

http://www.engineeringtoolbox.com/gases-solubility-water-d_1148.html

I'm not a chemist either but do these charts point to CO2 having a much better ability to pick up moisture vs N2

If so how is CO2 not superior as a purge gas, holding charge or any other process over N2?

 

[ICanHas]

http://www.engineeringtoolbox.com/gases-solubility-water-d_1148.html

I'm not a chemist either but do these charts point to CO2 having a much better ability to pick up moisture vs N2

If so how is CO2 not superior as a purge gas, holding charge or any other process over N2?

You're looking at how much gas dissolves in water. Not the ability of gas to evaporate water. One issue with CO2 is that it's like salt.

Stainless can hold water or salt. But marine environment is corrosive to even stainless. CO2 is also corrosive in presence of moisture.

 

[itsiceman]

Also with the slower solubility of N2 does that also relate to its removal from the system?
From what I'm hearing bad stuff is easily removed with evacuation and good stuff is not :-/