Originally Posted by RatFink
Hydro testing always scares me. Think of this: aluminum and carbon and resin have relatively low fatigue resistance: IE. they don't spring back real well. So to make sure your tank is safe for the next three to five years, they stress the s**t out of it and then return it to you. The tanks only have a 15 year life as it is and are very overbuilt. Just something to think about.
Keep this in mind, when you fill the tank to 4500psi, your doing the same thing. When they test the tank, they are checking to see how much it expands and how much it contracts back. If it does not contract back far enough it fails. Being that this happens on a regular basis, not to that extent though, I feel perfectly comfortable with the hydro testing process.