filling station

[oldschooltofu]

wondering if anyone using the ExO2 filling station had any feedback, likes/dislikes.

also if you have a #'s per hour filling

with what they say 24-36 hours per 2000# tank would mean 55-83 #/hour

can anyone narrow this down
thanks.

[ArtcoInc]

I think you have your units confused. The 2000 refers to the *pressure* (in psi), not the *volume* of oxygen.

They say that the ExO2 machine is capable of filling a "standard" oxygen bottle in about 24-26 hours. But, they don't say which "standard" bottle that is. Let's *assume* that is is a 'K' tank, which holds about 250 cubic feet of compressed oxygen.

To fill the bottle, you need both to be able to pump in *enough* oxygen (the volume), and at the proper *pressure* (psi), necessary to fill the bottle. The ExO2 uses a standard 5-8 lpm concentrator to supply the oxygen, then compresses the resulting oxygen to the pressure necessary to fill the tank. The ExO2 compressor can not create more oxygen than the concentrator provides.

So, it's still going to take a certain amount of time to be able to pump the amount (*volume*) of oxygen necessary to fill the bottle.

Let's do the math:

If we *assume* that it is a 'K' tank (which holds about 250 cubic feet of oxygen), and it takes the full 36 hours to fill, the flow rate is:

250 cubic feet = 7079 liters

7079 liters / 36 hours = 197 liters/hr

197 liters/hr = 3.27 liters/minute (lpm)

This is about right, because to keep the oxygen purity up, you typically don't want to run an oxycon over about 80% of it's rated flowrate.

A smaller oxygen tank will take less time to fill, obviously.

HTH

Malcolm

[oldschooltofu]

right...

24 and 36 hours to fill a k tank are vastly different numbers. is 24hours for a smaller tank 251 and 36 for a larger tank like a 337 cuft.

or is it that if the 251 tank is completely empty it takes 36 hours and if its less empty it takes less time.

what i was refering to was when you get a full tank the second regulator dial says about 2100psi. as you work this needle moves down. i can estimate my use per day (or the volume left in the tank) by how much this needle moves down. what im trying to figure out is how much will the tank fill up if i let it run from the end of the day till morning.

and i did the math based on your numbers and it came out at 56psi per hour (based on taking 36 hours to fill a 251). so if i work 8 hours per day and have 16 hours to fill the tank overnight, then i can use approximately 896psi on the second dial on the regulator. which is about half a tank(43%). or if you use the it takes 24 hours to fill, then one could use aprox 1328psi (63%) of oxygen in 8 hours and be filled back to full in the morning.

[ArtcoInc]

Have you noticed that the first half of your oxygen tank seems to last forever, but the second half goes real fast?

That's because the drop in pressure is not linear. Even if the amount of oxygen you use is constant, the "psi per hour" will not be.

or is it that if the 251 tank is completely empty it takes 36 hours and if its less empty it takes less time.

Correct.

Malcolm

[kbinkster]

Have you noticed that the first half of your oxygen tank seems to last forever, but the second half goes real fast?

That's because the drop in pressure is not linear. Even if the amount of oxygen you use is constant, the "psi per hour" will not be.



Correct.

Malcolm

That's right. As you start out, the holding tank is empty (or certainly not full) and when you start filling it up, the pressure gets higher as more oxygen is being forced into the tank.

So I guess, Ryan, you are probably wanting to know how much volume you would have in the tank after filling it just overnight and how much pressure it would be under.

[Lynn Burgess]

I would also like to know. I have been contemplating getting one of these.
Just trying to fit it in the budget. Ross, do you have any idea what it costs per day to run this? (electric)

[oldschooltofu]

so i got my filling station in today, my tank is empty and i hooked everything up to fill it all weekend so i have a full tank on monday morning.

well first off....there is no instruction manual.
second off they sent me a jenky plastic hose to connect the concentrator to the filling station that leaked when i soap tested it. so now im starting to get pissed that i spend a lot of money on a piece of equipment and they send me shotty hose and fittings.

so luckly i found a green hose with proper b fittings and hook it up. let everything run for a little while and the yellow light comes on saying O2 too low.

so i soap test all my fittings again and check that everything is running properly. I even try hooking up my huricane and still no luck. then i hooked the concentrator (that came with the filling station) to my torch, and could not get a good flame, kept blowing out the flame. like it as mostly air and not enough oxygen.

so it keeps saying O2 below normal.

does anyone know the problem here?
did i get a bad one?

im quite pissed i cant fill my tank this weekend.

Lynn: the filling stating uses 2 amps 115 volts if it helps to figure out electricity