On Sun, 05 May 2013 17:16:51 -0400, woodchucker
Well, this tank hadn't been used for years the owner said. I let the
water out of my tank weekly, how long do you let it sit there.
I figure that years of sitting means deep rust inside. Based on the
stink of that water, I'd have to say it's been in there a long time.

In other words, you're afraid that the tank might be on the verge of
blowing up in your face, right?

Compression takes in poor condition, usually develop pinhole leaks
first, which would indicate that it's time for you to replace it. Of
course, you could replace it now, but most people continue to use them
until they start to leak.

In other words, you can use it until there's a problem.