I have two 88 cubic foot 4500 psi tanks, and just remembered, that April was the last month I could get one of them filled before it needed a fresh hydro test. I forgot to do that, but that's okay, because I have a couple of guns that run on less than 3000 psi fills.
The tank is currently down to 3100 psi. The good news is, my Marauder pistol runs on 2650 psi fills, and my Discovery rifle, runs on 2000 psi fills, so I'm just going to designate this tank for use with those two guns until it's down to 2000 psi, and then I'll jump through the hoops to get it hydro tested.
My other tank still has about a year left on it before it needs to go in for hydro testing, so I'll designate that one for use only with my guns that run on 3000 psi fills.
So why not just run everything off of the tank with the current hydro, and get the other one in to be tested? Because I just don't want to mess with it right now. I'm having way too much fun hunting ground squirrels with my P-Rod, and I can still use the air left in the expired tank to fill the P-Rod dozens of times. That equals a lot of shooting, and a bunch of ground squirrels that will now have something in common with this tank. They'll all be expired. Sorry couldn't resist.
And not only that, but I don't want to waste $5 bucks worth of air, when that $5 bucks could go for a Subway foot long sandwich. Have I got my priorities straight or what? LOL.
When the tank gets down to 2650 psi left in it, I'll just switch to shooting my Discovery rifle, that runs on 2000 psi fills, and just keep on keeping on. This winter, when there aren't a whole lot of hunting opportunities around here, I'll get it in for a fresh hydro test.
In the meantime, let's go squirrel hunting.