Cylinders

We're often asked "How many times can you hydro a cylinder?"
Well lets say you would have to hydro the same cylinder everyday for about 200 years and the cylinder would still be usable.
Here is a cylinder that came into our facility for re-qualification. This cylinder is the oldest cylinder that we've seen so far to date.

1919!! That's WWI people.

Not only is this extremely old, but from it's markings, it has been hydrostatically tested every 5 years for almost 100 years!  Unbelievable!