...About those "imaginary" compressor explosions....

I use my compressor almost daily and I drain it EVERY day when im done using it.
I work in the petroleum business and have seen all these safety videos over the years. The steam boiler explosions are pretty scary. We have a couple 500 hp steam boilers that are two storys high. I once saw a video of a boiler explosion and it shot like a missle through two buildings. Yes, all the way through both of them.

The correct way to test a pressure vessel would be a hydro test. Hydro tests are much safer because if it blows its much less violent than if it was air.