That is awesome. Congratulations!
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http://www.angelfire.com/cantina/carbonation/PumpSystem.htmThat's interesting. The coolest thing I learned on my recent tour of the Sierra Nevada brewery is that they capture their co2 from fermentation, so they went from 4 trucks a week of co2 to 4 trucks a year. It's a fascinating idea and I wish us homebrewers could have something like that so we could limit the amount of co2 we have to buy. I think it'd be a bit pricey and maybe too complicated for me.
Here's the CO2 recovery and pump thing.
At beer camp they pointed out that the esters and alcohol has to be removed to get the purity of CO2 they need ( we know that air locks don't just smell like CO2).
This one time, at beer camp...
You're adding just as much air when you open and throw in the dry hops. I just don't worry about it until it's time to rack, and then I make sure the receiving keg is fully purged with CO2.
I'd also be careful about using a stopper and creating a vacuum... have you ever seen a commercial fermenter that has imploded? Not a pretty sight.