That's a fantastic article that helped me a lot when I was getting my fill station up-and running.
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
One note on the background. I *think* there might be a misconception in the article. I'm somewhat new to the hardware involved, but I believe the assumption that the burst disc functioning protects you from the lack of hydrotest is incorrect. As I understand it the burst disc prevents over-pressurization of the tank. The hydrotest is to check that the tank material has not been stressed past it's yield strength.
In short, the concept is that a hydrotest verifies the tank is in good shape regardless of the burst disc. A bad tank in theory could rupture regardless of the burst disc. If it's anything like a valve getting knocked off, probably remarkable dangerous, hence hydrotests. (?) Maybe I'm reading it wrong- see above disclaimer of experience level