:doctor:
I get the cracks about diving dbl HP 120's in cave country all the time as well. It's no biggie since my air consumption is usually better than most, and I have yet to turn a dive based on my air supply. If doing Deco I will use a combination of Al 80's and Al 40's, generally as the travel gas leaving the back gas in the HP 120. And when diving trimix the issue of gas compressability has never really been much of a concern. I can make adjustments on the amount of He I need as far as what my LP 104 buddies use. My bouyancy is not hard to achieve using either LP104 or my HP 120's. I do have them mounted so that they are not banging my butt or bumping my head. Maybe I am at just the right height. If you want to overpressure a cylinder than thats up to you. Most places that I know have no problem giving me the fill that my cylinders are rated for. Some shops simply have a policy not to fill past 3000 or the cylinders working pressure. As for diving with my HP 120's well they do just fine for me and I'm not carry the weight
I get the cracks about diving dbl HP 120's in cave country all the time as well. It's no biggie since my air consumption is usually better than most, and I have yet to turn a dive based on my air supply. If doing Deco I will use a combination of Al 80's and Al 40's, generally as the travel gas leaving the back gas in the HP 120. And when diving trimix the issue of gas compressability has never really been much of a concern. I can make adjustments on the amount of He I need as far as what my LP 104 buddies use. My bouyancy is not hard to achieve using either LP104 or my HP 120's. I do have them mounted so that they are not banging my butt or bumping my head. Maybe I am at just the right height. If you want to overpressure a cylinder than thats up to you. Most places that I know have no problem giving me the fill that my cylinders are rated for. Some shops simply have a policy not to fill past 3000 or the cylinders working pressure. As for diving with my HP 120's well they do just fine for me and I'm not carry the weight
