Standard gasses?
- Thread starter rjack321
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MonkSeal
Contributor
Since I have decent depth at my usual locations, I usualy dive 21/35 or 18/45 (combined with 50% and O2) as per GUE standard mix chart. For shallow (0-100') I mostly use 32% (rarely combined with O2) but I have only handful of such dives yearly. When I dive with my kids (0-15') I dive air.
OP
Good point, however its obvious that many people who try to dive DIR are either forced to or chose to dive air in certain circumstances. My DIRF class was even conducted on air.
Even though Rtodd has moved this to the regular DIR forum I would appreciate if the discussion could remain amongst those actually trying to be DIR. So, ENDs <100ft and other DIR gas issues still apply.
I believe my initial list was actually quite "DIR" even though it included both 30/30 and 25/25 as options.
Even though Rtodd has moved this to the regular DIR forum I would appreciate if the discussion could remain amongst those actually trying to be DIR. So, ENDs <100ft and other DIR gas issues still apply.
I believe my initial list was actually quite "DIR" even though it included both 30/30 and 25/25 as options.
lamont
Contributor
OP
Discussing reality vs. a strict interpretation of the rules is fine within reason. Air on really shallow dives, not a big deal. It just doesn't matter. But the 28% goofiness, wasting time with less than 30% helium, etc. is stepping over a line that a newly minted Fundamendtals student should be able to spot. Fair enough?
For those of you that have access to O2 clean air and don't bother to put a K bottle or two of O2 in your garage. Well, that is just odd. I have never been anywhere where I couldn't get a decent enough relationship with the local dive store to give me air tops and that includes Australia where they really, really love their ridiculous rules.
Well, you're just going to have to trust me when I say that this is not all that uncommon.
There is more than one shop within a few hours of me that will not, under any circumstance do that.
Yes, they are retards, but knowing this to be the case still doesn't get you the gas.
Those of us with our own stations can forget what a PITA it can be sometimes.
OP
There are 4 shops within 1 hour (one way) of me now, choices:
15 min shop: no air or 32% tops of anything
15 min shop: not O2 clean air
45 min shop: will do air tops or pump whatever trimix you want
40 min shop: would do air tops if you want I guess, standard GUE mixes only
I still have a compressor
Seriously though I PP blended 30/30 for awhile but OMG that is almost impossible unless you're getting 2400psi Ts of both He and O2. I think I remember adding 1500 psi of both. That's only a 900psi less than full in one of those cylinders so there's not much "usable".
Since I'm CBing now I can make whatever I want. I rarely use 25/25 or 30/30 but having I leave both open as an option. In the last 6 months I've used each like once. I guess that's due to a bit of a hole in my local diving depths. They are either 120+ft dives or <100ft dives. There's a little 20ft gap in there which rarely gets exercised.
25/25 I can understand the potential need/appeal. 28% with an END >100ft is nonsense. I'd guess that -15% EAD?? How would that work for RD?
15 min shop: no air or 32% tops of anything
15 min shop: not O2 clean air
45 min shop: will do air tops or pump whatever trimix you want
40 min shop: would do air tops if you want I guess, standard GUE mixes only
I still have a compressor
Seriously though I PP blended 30/30 for awhile but OMG that is almost impossible unless you're getting 2400psi Ts of both He and O2. I think I remember adding 1500 psi of both. That's only a 900psi less than full in one of those cylinders so there's not much "usable".
Since I'm CBing now I can make whatever I want. I rarely use 25/25 or 30/30 but having I leave both open as an option. In the last 6 months I've used each like once. I guess that's due to a bit of a hole in my local diving depths. They are either 120+ft dives or <100ft dives. There's a little 20ft gap in there which rarely gets exercised.
25/25 I can understand the potential need/appeal. 28% with an END >100ft is nonsense. I'd guess that -15% EAD?? How would that work for RD?
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