Filling scuba tanks

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are you wanting a small compressor or a large SCUBA compressor, I use a Large SCUBA compressor to fill my SCBA tanks to 4500 psi, many people use the small Yong Heng compressor to fill SCBA and SCUBA tanks with cooling modifications, also It takes awhile, but it will fill them, I don't recommend any of the Oil less Waterless compressors, they are just meant for filling the gun only.
 
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Yong Heng compressors are popular. They are cheep and so are parts when something breaks. I got some use out of mine but was not overly impressed with it. It started to have issues so I gave it to a friend so he could use it to fill his air gun. It will not fill past like 3600 psi or something now. I went ahead and upgraded to an Omega super. Do your research and go from there. There are a a bunch of options out there and there will be pros and cons, as well as issues for just about every brand it would seem. My only suggestion would be to make sure parts can be had just in case it needs to be repaired.
 
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Yong Heng compressors are popular. They are cheep and so are parts when something breaks. I got some use out of mine but was not overly impressed with it. It started to have issues so I gave it to a friend so he could use it to fill his air gun. It will not fill past like 3600 psi or something now. I went ahead and upgraded to an Omega super. Do your research and go from there. There are a a bunch of options out there and there will be pros and cons, as well as issues for just about every brand it would seem. My only suggestion would be to make sure parts can be had just in case it needs to be repaired.
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The Omega compressors are built more like a hand pump and use o-rings for rings for compression rings in all cylinders. They are much more complex than the Yong Heng. Not sure they are really much of an upgrade. I really would not like to rebuild one as regularly as they probly need it.



https://www.youtube.com/watch?v=IylDJ1DDMSQ&ab_channel=airgunsofarizona



IMHO about the best compressor you can get, without spending thousands of $, is the Yong Heng for around $300 and I believe most would agree.

https://www.airgunnation.com/topic/experience-based-opinions-on-yong-heng-vendors-request/#post-1039607


 
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Keep your yong Heng cool as possible to fill otherwise I would recommend a booster to fill it takes longer but they will last longer too I burnt up my first yong Heng letting it get up to the highest temp they said it could reach before shutting down and letting cool more
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Yup heat is the enemy of all of the compressors and taking anything to it's maximum operating level, heat wise, will likely damage the unit in short order. They don't require any kind of a booster.

I take mine to a max of 60C and am now well into year three on my second Yong Heng. It has required minimal repairs thus far.
 
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I have bought a second one also like it very well but I'm sticking to my shoebox for now until it dies I got it to top off my big scuba tank from 3000 to about 4500 4600 something like that in 4 hours it will fill my 90 cu in from 0 in like a hour I changed out the pulley on my first rebuild after 200 hours and it really fills fast now went to freedom 8 pulley onto my older shoe box I'm sure it will go threw rebuilds quicker and belt isn't quite lined up but it cut fill times in half or better 
 
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Both of my Yong Hengs developed problems this weekend and I went online and I will have them both running again for $105. I was going to get an Omega Air Charger this time but it just doesn't make much sense to, in my case. They are really easy and cheap to fix, if you have to, and you don't have to that often. I fill 9L, 6.8L and a 2.17L tanks to 4500psi. While browsing around I saw a Yong Heng selling for $250 shipped, and actually bought another. Oft quoted "two is only one, one is none", so I figured I wanted to have 'two'. It was the $250 price, shipped to my door, that changed my mind. I could buy five of these things for the price of the Air Charger. If and when I need a more quiet compressor I'll get an Air Charger. In three years of use I have had one pressure disk blow on first use, so it was probably just a bad disk. Leave the bleeds open on start and stops and these things will fill your tanks many times. Opinions vary, but to me, I would rather fill my tanks to 4500psi all the time and maybe have to fix something every year or two, than constantly underfilling my tanks.
 
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I use my Yong Heng to fill my 45 minute SCBA tank. Sometimes to 4000, sometimes to 300 bar. I just added a 12 pipe computer equipment cooler and a couple fans to it and I am hoping I can now do a fill from 3000 to 300 bar in one session. Previously I've had to do it in two or 3 sessions. I used it once to pump the tank from 3600 to 300 bar and it didn't even get much past 50 C. I put NuvAir 751 oil in mine - expensive but I like to use good oil in all my devices. It also needs an accessory drier. So the initial purchase price may be a bit deceptive, at least if you want to fill tanks. But with another $100-200 of mods, I think it is a good option. Filling my 45 minute tank takes maybe 15 minutes of running time. I don't think you need the more expensive gold colored drier, I bought the black one first and I put color changing dessicant in it and it will do several tank fillups before getting wet. Black one costs less than half what the gold one goes for. I also bought the bigger one but haven't used it yet. I also added a bigger coolant pump. I think the stock Yong Heng works well for filling guns as is but if you want to fill tanks, I think you need to plan to add a few things to it. Or be very patient.
 
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My scuba tanks are 100 120 133 I don’t dive with the 133 I do pool repairs I patch holes under water, but I use these tanks for my air gun too
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I don’t think you want to be filling your tanks for breathing air quality with a yong heng. If that’s a main purpose for your tanks, get them filled at a dive shop or invest in a dive rated compressor.

in fact, know that any compressor sold as a pcp compressor in the less than $3K range, I’d steer away from for breathing air. Dive compressors use special oil and moisture filtration, so not a single trace of oil gets in your breathing air. 

Unless you’re equipped to spend the bucks on a dive rated Alkin or Bauer, just have them filled at a dive shop
 
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Bigragu


Scuba Tanks Charcoal filter what is your thoughts on this? I don’t need to fill them to max pressure I am working in swimming pools 

C921F3E7-86C4-4728-95FF-38A7FCBE2BB6.1631907100.png

 
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Don't use a Yong Heng for breathing air, even with the 2 stage filter shown in the preceding post. The problem with buying a cheap compressor is that guys want them to do things they aren't designed to do. First problem is that if someone adds up all of the accessories, fittings, filters, and attachments, then repair parts, then replacement compressors, they end up with a higher cost per fill than if they had purchased a higher quality compressor in the first place.

Yong Hengs are decent economy compressors if you just use them for what they were designed to do. Go to a dive shop or buy a dive compressor if you need to breathe the air. Your lungs are worth more than saving a few hundred bucks on a compressor.
 
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If it's breathing air that you want then take the advice from Bigragu and Humdinger. The filter system above may be ok to scrub the air to a safe level if you use the right nontoxic oil but it will cost you more than a Yong Heng pump and I personally wouldn't trust it for my lungs. You will be looking at $3-$5K for a propper dive compressor and that kind of money will get you a lot of fills from a dive shop.
 
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