does it make sense to dive trimix in single tank

[eelnoraa]

It can be a dump question, but let me give it a shot anyway. I saw someone filling a single tank with trimix at LDS today. Don't know what the mix is, but my question is: does it make sense to dive trimixes for recreation with single tank? Say 30/30 or 21/35. Single tank will mean NDL/MDL dive. 30/30 is a interested one, MOD of 100ft, same as 32%, why use it at all, double or single? does it give you longer NDL/MDL time? 21/25 has MOD of 150ft, obviously limiting factor is single tank capacity. so people use it to do a bounce kind of dive to 150ft? What is the deal?

 

[Rainer]

I put trimix in single AL80s pretty regularly. Now, I tend to take more than just that one cylinder on the dive...

Personally, it's not worth it to me to mix up some 21/35 in a single (even a big HP130). At the depths I want that gas, I also want redundancy (doubles). Similarly, on the rare occasion I use 30/30, it's due to complex dive plans in the 100' range. In that case, too, I want redundancy.

 

[Scott L]

It is not uncommon for elite spearfisherman in these parts to introduce some He into their amply filled LP120's, Etc. for a more productive and safer deep dive...

 

[asha]

It could be bailout for a rebreather diver.


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[TSandM]

I could see 30/30 for a 100 foot dive, if the dive is one you either want to remember clearly or one which requires, or might require some clear thinking.

I won't incur a deco obligation on a single tank, but I know friends who do.

 

[eelnoraa]

It could be bailout for a rebreather diver.

I thought of that for a moment, but it was a steel tank. Either HP100 or LP80/LP77 kind of size. That is why I don't think it is a stage or deco bottle. Too big for rebreather too.

I could see 30/30 for a 100 foot dive, if the dive is one you either want to remember clearly or one which requires, or might require some clear thinking.

I won't incur a deco obligation on a single tank, but I know friends who do.

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

 

[M-diver]

Side mount maybe?

 

[Nitro91]

drysuit inflation maybe?

 

[ucfdiver]

I would use 25/25 to hit the 130ft range I guess, but the lack of bottom time before NDL would more than likely cause me to skip the dive or take proper doubles and deco bottles.

 

[LiteHedded]

i've done it