I recently bought two HP 100 XS Scuba steel tanks. From an equipment maintenance, safety, and reliability perspective how low are people comfortable breathing a tank down?
A few questions:
1. At what pressure do we really risk getting water sucked into the tank and then rusting/corroding the inside?
2. If you've surfaced with less than the ideal pressure remaining, what if anything should you do from a tank maintenance perspective such as removing the valve to visually inspect it or let it dry out etc. Do you feel it should be officially VIPed again just because you surfaced w/ a low pressure?
3. Would you treat an aluminum tank differently than a steel one?
For simplicity, lets just talk about the tank maintenance and not any gas planning. Assume we've completed any deco/safety stop obligations, are right under the boat at 10ft so we can easily and safely surface, and just happily watching something around us and want to stay longer, but not at the cost of our equipment.