If the compressor is fast enough, it can heat up the tank, just as your home-shop compressor heats up.
If you fill one of the fiber-wrap tanks too fast, it can damage the wrapping by overheating. That's obviously not too much of an issue with these little compressors, which fill in hours, not seconds, but the faster ones can still warm the tank appreciably.
For most people, the main issue was you'd fill your tank to 3K psi, and once it cooled down, you'd only have 2,800, or even 2,600, depending on the heat and size.
So the trick- for the paintballers anyway- at least off the field, is to have the tank in water.
I'm told similarly, that one of the tricks to keeping the Yong Heng compressors running, is to keep it cool. Apparently the stock fan is simply not up to the challenge, and so users have worked up fans and cold packs and the like for those, too.
Also, all compressors, like the old car engines used to, need a "break in" oil change. I'm told this is almost crucial for a Yong Heng- run it briefly, change the oil, run it briefly again, change it again. After that, the lifespan is greatly extended. (They also recommend swapping the oil plug with a breather- the compressor doesn't come with a vent for the crankcase.)
Moisture separation is a big one- the drier the
intake air, the longer the rings and valves last. That was one of the nice things about the Shoebox- your shop compressor acted as the first stage, and air draw was slow enough that unless you had a really tiny tank, the moisture had a chance to settle out before getting to the Shoebox. (I have mine on a manifolded Rapidair system- there's fifty feet of manifold and two coalescing filters between it and the 60-gallon shop tank.
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Personally, no, I don't like having to buy Chinese crap for something like this. I'd rather have bought the American-made unit. But so many people buy on price over and above anything else, there was no way for Kaye to compete, especially at the comparatively low volumes like this.
BUT... at the same time I'm glad such things are available. I spent a good portion of my paintball career having to buy expensive tanks of nitrogen, drive fifty miles to get a SCUBA tank filled, to play an entire day on just 2K psi of air, and so on. OR buy a $6500 compressor.
Doc.