I don't have an air compressor yet, I know nothing about them, and don't know anyone in person that owns one, but I was thinking about getting one for running an impact wrench, air ratchet wrenches, and occasional painting.
After some Google searches, I came across a few threads about air compressor tanks exploding. It was sometimes caused by corrosion, sometimes a bad relief valve, or bad pressure switch, or any combination of the 3. I've also read that bad welds, a weak tank, or other problems can contribute to a potentially fatal explosion.
I was originally going to buy the Harbor Freight 47065 "4-1/2 HP" vertical compressor for about $150. It's oil lubed, so I thought it would be a much better (and cheaper) alternative than picking up a cheap oil-free compressor from Wal-mart. This would be for light occasional use anyway, so I'm not too concerned about full cast iron pumps or belt drive. My other alternative is to drop $400 on an oil lubed Craftsman or Campbell-Hausfeld.
However, we all know Harbor Freight products are Made In China which is not a country known for making high-quality products. If I buy a cheap Chinese compressor, do I risk poor welds on the tank? A weak tank made with poor grade iron? A pressure relief or pressure switch that's likely to fail? If I'm risking my life by going cheap, I'd definitely spend the extra money. If the HF compressor is perfectly safe, then I'd rather buy it and save the money. Anyone have experience with the HF compressor? I know compressor tank explosions are few and far between, but I'm a very safety-oriented person.
Also, a quick question about compressors - when the compressor is not being used, do most people leave the tank pressurized at all times and the compressor plugged in, or do most people unplug them and bleed the pressure out of the tank?
Thanks,
Shawn