W.C. X 0.80 = legal capcity of refrigerant.

Tare weigth is the weight of the vessel itself.

 

So w.c. 26.6 X 80% = 21.28lbs of refrigerant right?

 

To make it easy, yes.
The "WC" is based on the weight of water it takes to fill the cylinder, many refrigerants, including R-22, take up less volume per pound, so more pounds of refrigerant will safely fit in the cylinder than is indicated by your equation.

There is an equation you can do to figure out exactly how much refrigerant can be put into the cylinder, based on the specific volume of the refrigerant vs that of water, but it is probably best to just keep it simple.

 

slides of fill rates

I made this up for my students from information from the National Refrigerants Manual. Notice that the filling factors are for 100% full tank so you'll need to take 80% of the calculated value. The Chart is available in the manual which you should be able to get at any United Refrigeration place.

You'll see if you just use the .80 value you'll be off for some refrigerants, especially 404.

 

I made this up for my students from information from the National Refrigerants Manual. Notice that the filling factors are for 100% full tank so you'll need to take 80% of the calculated value. The Chart is available in the manual which you should be able to get at any United Refrigeration place.

You'll see if you just use the .80 value you'll be off for some refrigerants, especially 404.

Thanks for the link to the chart.
I hadn't ever looked at the specific density of R-410a before, glad I didn't pop the pressure relief of any recovery tanks, lol.

 

What about mixed refrigerants? We work with 22 and 410a... My employer doesn't provide one for each so we end up dumping a little 410 into our tanks with the 22. (no, we don't re-use... or at least I don't.)

 

Mixing refrigerants is a no-no. Your employer is going to get hit with a nice backcharge for every tank of mixed ref the chemical company has to destroy. It's much cheaper to just do things right.

 

I have one of each on the truck both look the same as far as colour. Just the company had a stencil made and sprayed with black paint 410A or R22.

 

Tare weigth

Tare weigth is the weight of the vessel itself.[/QUOTE]

What my vessel is marked for TW is 16.5lbs, but on my digital scale it really weighs like 7.7lbs. that through me off, as I thought the same as you stated. I don't get the descrepancy. any Ideas or explaination?

Thank You,
Gregg

gapfaff@engineer.com

 

What my vessel is marked for TW is 16.5lbs, but on my digital scale it really weighs like 7.7lbs. that through me off, as I thought the same as you stated. I don't get the descrepancy. any Ideas or explaination?

Thank You,
Gregg

You need to check your scale, it is malfunctioning.

You also need to remove your email address from your posts, unless you want to end up on every spam mailing list in every spambot computer on the face of the planet, lol.

 

alot of supply houses around here have stopped taking recovery cylinders back, yet they sell them .. only place around here that takes them is United Refrigeration & they sell the One-shots

 

20.96 Lbs.........80% 0f W.C.(26.2)Lbs. + 16.7Lbs T.W. = 37.66 Lbs

 

Dawg, in the chart you posted, on the first page R-410A appears twice, is the yellow line for the 130* and the pink for 125*?

 

Yes that is correct.

I've notice the footnote is identified wrong, sorry about that.

 

I have this in three ppt slides if any other instructor would like a copy. Check my profile and email me.

 

If you dont' mind, I would appreciate a copy of that ppt also. Would be nice for
some of the NATE stuff I am doing thru RSES.

e-mail in profile.

Thanks.........GF

 

Dawg,

Love Power Point Presentations.

Can't find an e-mail in your profile. Stevens College link won't go through.

If you'd send me a copy of the ppt. to e-mail in my profile, I'd appreciate it.

 

Dawgtchrr: Got it. Thanks alot.

I had been googling refrigerants to find specific gravities. Surprised me the wide range from R-113 (almost 1.5) to some of the blends that are less than 1.0....I had always "ass-u.me"d that all refrigerants were heavier than water. Been around low pressure machines too long I guess.

Gapfaff: 3.) (In hopes of settling an argument) Is there a fine for having refrigerant in an outdated recovery tank?

The way I understand the ruling is: "Fill AND
transport. Therefore you can use an expired tank to reover and recycle back into the unit as long as it is empty in your truck while you are travelling.

 

EPA enforcement and certification

EPA enforcement seems non-existent in my area along with the professional ethics of some of the hvac contractors. Some people in my area pass the refrigerant handling certification with out any Refrigeration training/education and only know enough to be dangerous, but they think they're refrigeration techs. I think there should be more of an education requirement Before the credential is made available. It is too easy to get. I would be interested what this groups opinion is also.

Thank you

 

EPA enforcement and certification

Hum...suddenly it's very quiet????????? Must have scared you guy's with this one?

 

Hum...suddenly it's very quiet????????? Must have scared you guy's with this one?

Personally I think it's all about the money. As an educator I have a vested interest in raising the standard, but thinking as a contractor, I think I pay enough in taxes and other fees that not much is left to put food on the table let alone pay for more training with test taking

 

The recovery cylinders are being changed to all high pressure cylinders.You can put any refrigerant in these cylinders but you cannot mix refrigerants.A 30lb usually is 15lbs with a total weight of 35lbs.A 50lb is usually 38lbs with a total weight of 63lbs.But you should mark the tank with what refrigerant is in there.A simple pressure and temperature reading will confirm.

 

No. We've all heard that same story. It's like that everywhere, which is why there are so many hacks out there. Nobody wants to bother commenting because well, they've said all they want to say about it already.

 

same story...hacks



OK, I understand. It's too hard to regulate. It's an honor thing/ Professional ethics. It had been suggested by my employer that the job didn't have to take too long because "nobody is around". I Stood FIRM. I need this job in my current situation, but I'll quit before taking Short cuts and will turn in violators if I see or know of illegal, intentional venting. I do that for my and everyone elses grandchildren who will suffer the consequences. Please, I hope everyone here does the same.

Thank You all

 

I know the tare weight of the recovery tanks we use is 27.8 lbs and that is what ones I have weigh empty. Every one I've came across that is. I'm sure they range in size.

 

If you take a full cyclinder of mixed gases back, the destruction charge for mixed gases is more the a recovery cyclinder cost.
So if your employer isn't complaining about that cost. Where is that refrigerant going.

 

good question. Now I'm curious myself.