Quote: (Originally Posted by
Sutty)
Thinking of a mod to my Kiss Classic (details elswhere). Basically an off-board O2 (or other gas) add. A QC would be useful as I may not want the extras for many dives.
My question is - which QCs are best for O2? Swagelok have some PTFE sealed versions, but most people (for various gas add systems) seem to use the 4 or 6 series stuff.
Anyone with any experience or thoughts?
Neil
Few things to consider:
(1): 02 systems do not need the flow rates to support open circuit flows (unlike dil systems that may feed an ADV/BOV/etc), so the QD's used may be smaller in diameter and lower flow than one used for diluent offboard feed. A standard BC type inflator hose QD will work just fine.
(2): 02 cleaning is not anything to obsess over in the low pressure range, as there is zero worry of sufficient heat being caused by a rapid pressurization at those low pressures. Materials are not an issue either. Use "any old" and you'l be fine.
(3): There are NO quick disconnects that entirely exclude water when connected underwater. With that said, for any given system of disconnect, the smaller the disconnect diameter, the less water inclusion. This again leads to the idea of using a low-flow, small diameter disconnect, something that has not been common practice, but something that deserves a second thought. Solenoids are sensitive to salt water, far more so than manual adds and ADV's, so think this thru before selection of a disconnect system. Naturally, it's best to not connect them in the water, but if you do connect them: Less included water is better.
(4): The offboard gas add system that I showed before with photos is still the easiest way to go. The one for the Inspiration that I showed also acts as a solenoid isolator. Study it and think about that too.
Best,
Dave
.