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@tmassey are those buoyancy characteristics for tanks in salt water? ~+2 positive when empty with valve for the Faber LP108s seems a little off, at least for freshwater.

I understand what you're saying tmassey! I just wanted to point out that the cylinders are indeed marked as that. I do see that the original hydro has a + stamped next to it, which seems to align with what you were saying regarding the 2640 pressure.

@tbone1004 I'm pretty sure these are pics of the service pressure and tank volume on my Faber 108s

Appreciate the info! Even with the updated calculation, I still think the calculation may be 20-30 cuft higher than the actual volume of gas if LP108s/104s and HP130s truly contain the same internal volume.

My Faber tanks have 108cuft at 2400(psi) stamped on the neck.

Hey all, I am interested in understanding how to better calculate the volume of gas in my cave filled LP108s. This seems particularly important when diving with a team with HP tanks. The simple calculation to do this is 108/2400*3600*2 which gives you 324cuft of gas. However, as I understand...

The corregated hose is typically held on by zip ties, just cut or twist them with a pair of plyers to break...

I'm not sure what being an instructor has to do with tech diving. Most instructors are teaching open water type classes that aren't really equivalent. Just enjoy the dives is my recommendation and progress if you're gear or training is limiting the dives you want to do. 50 dives per year seems...

The 1st stage supplies gas on demand based on breathing rate/volume, etc. to "refill" to intermediate pressure. Therefore, you don't really have more flow of gas if you have a higher or lower IP. I don't think you're analogy of two tanks with one valve cracked and the other valve fully open...

Why do you feel the need to go fast on a drift dive?

Are you going to be at 1.4 for your entire dive open circuit?

Sea Potatoes!

I didn't realize you could use the Waterproof seals with si-tech systems? Is this true for both the wrist and neck seals?

Honest question, if the diver needs 26lbs to sink just himself with no exposure protection, then isn't that just getting the rig to net neutral? Does fat lose buoyancy at depth like a wetsuit?

I haven't dived the Oriskany but I'd like to one day. My understanding is the flight deck now resides at about 150 feet. Assuming your dad's cabin is below that, it might be a pretty deep dive. Personally I'd want to have some helium in my mix for that, especially if penetrating the wreck and...

Drysuit or I have a Deep6 7mm wetsuit as well that I'd highly recommend

Are you planning to do this dive on air? Was under the impression that the Extended Range course was done on air

Before you jumped in the water did you test your gear? I.e. breath the regs, put a burst of air in your bc and drysuit, etc? Definitely sounds scary. Always the possibility to orally inflate if you absolutely have to once on the bottom

So you just deal with the squeeze?

Spare airs aren't really going to give you much gas at depth in an emergency. I'd put that firmly in the circular bin rather than pay to service it if it were me.