I have a nitrox card with my local shop, and they exclusively partial-pressure blend up from an empty tank. To try and be nice to the people at the shop, I try and bring my tanks in with about 150 PSI left in them, so they don't have to monitor running them down in the shop.
So, what I want to do is build myself some kind of auto-drain system that will stop draining when there's a set amount of pressure remaining in the tank. Is there any off-the-shelf solution, or one I could build with a spare first stage, to achieve this?
So, what I want to do is build myself some kind of auto-drain system that will stop draining when there's a set amount of pressure remaining in the tank. Is there any off-the-shelf solution, or one I could build with a spare first stage, to achieve this?