does it make sense to dive trimix in single tank

[ktomlinson]

Im currently taking advanced nitrox and was surprised to learn that some people deco dive on a single tank. There was one person in the class diving with a 95.

 

[Bombay High]

drysuit inflation maybe?

Helium specifically for a drysuit fill ? Why would anyone do that ?

---------- Post added May 15th, 2012 at 09:47 AM ----------

. Too big for rebreather too.

Too big as bailout ? Why ?

 

[waterpirate]

To me helium is a standard gas. I routinely put helium in a single hp 120, untill I got 2 sets of lp 72's. I do not want to ever make an immediate ascent, so doubles only for the isolation valve is the only way I dive anymore, plus helium.
Eric

 

[TSandM]

Is 30/30 really that different from 32% nitrox at 100ft?​

Having just done Ginnie Springs on 30/30 for the first time, I can enthusiastically and with complete conviction report that, for me, the answer is YES. Not only do I remember more than a vague, dark gestalt of the cave, but I came out for the very first time ever without a pounding, horrible headache and nausea. It was a totally different dive.

 

[LiteHedded]

Having just done Ginnie Springs on 30/30 for the first time, I can enthusiastically and with complete conviction report that, for me, the answer is YES. Not only do I remember more than a vague, dark gestalt of the cave, but I came out for the very first time ever without a pounding, horrible headache and nausea. It was a totally different dive.

it's good huh?

 

[Dave1981]

For me, once you add helium to the mix the stops you'd do for piece of mind become mandatory. Once I have mandatory stops I don't really want to dive a single tank. You could argue they're still NDL dives, but 30mins 30 meters on Nx32 and I'd hesitantly surface in one go. Same on 25/25 and I wouldn't want to do that without a couple of stops.

 

[GROBIOG]

If it wasn't for price, is there any disadvantages for having helium?

 

[PfcAJ]

Having just done Ginnie Springs on 30/30 for the first time, I can enthusiastically and with complete conviction report that, for me, the answer is YES. Not only do I remember more than a vague, dark gestalt of the cave, but I came out for the very first time ever without a pounding, horrible headache and nausea. It was a totally different dive.

And you looked at me like I was crazy for saying that I don't dive 32% anymore Its a real thing.

If it wasn't for price, is there any disadvantages for having helium?

Nope. The price thing becomes more manageable when you only pay for what you breath. It helps to have dedicated tanks so you never have to drain anything. I keep one set of doubles for deep stuff, and one set for shallow stuff, and dedicated stage bottles. Really helps out with logistics.

 

[GROBIOG]

And you looked at me like I was crazy for saying that I don't dive 32% anymore Its a real thing.



Nope. The price thing becomes more manageable when you only pay for what you breath. It helps to have dedicated tanks so you never have to drain anything. I keep one set of doubles for deep stuff, and one set for shallow stuff, and dedicated stage bottles. Really helps out with logistics.

...and that's why I'm looking for another set of AL80 doubles .

 

[mala]

If it wasn't for price, is there any disadvantages for having helium?

it on gasses quicker which gets you to deco much quicker.
hpns .
its also not too narcotic which may not always be an advantage.
off gassing is also quicker so ascent rates are more limited and depth management more critical.
it makes you sound funny.