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**neilh** · April 30th, 2007, 03:51 PM

Quote: (Originally Posted by Captain Calamity)

Firstly, hello everyone. Time to stop lurking and make my first post.

Welcome

Quote: (Originally Posted by Captain Calamity)

When I look at minimum gas requirement I only really need twin 12s beyond 25-30m - and I don't go that deep often. One option would therefore be to hire twin 12s on those occasions when I really need them, but then what do I do for the shallower dives?
...
Finally, would a 10L stage cylinder be a reasonable way to increase my gas reserve on those deeper dives without needing to hire twin 12s?

Picking up your last point first, if you took a 10L stage with a single 12 then realistically you're only 2L off twin 12s anyway - with the hassle of a stage instead

Granted the twin 12s are going to give you more than enough to cover min gas for most of your shallower dives, but is that a problem? With you and your buddies SAC would twin 12s give you enough gas for a typical day's diving? What about twin 12s with a top up from a 15L in between dives?

Personally I've moved from a single tank to twin 12s. I get the extra resilience of a manifolded set, plus they're nice to dive and have more than enough gas for what I do. Depending on the dives I'll either decant from a 15L into them in between dives to cover the second dive, or I'll take a stage (mainly because I'm trying to get used to diving with a stage).

I am setting up some regs for a single tank, but that's more for holiday dives where hiring twins might not be an option.

April 30th, 2007, 03:51 PM	#4 (permalink)
neilh (Online) Haemoglobin on the bus... Join Date: Nov 2005 Location: Barnsley, UK Posts: 1,914	Quote: (Originally Posted by Captain Calamity) Firstly, hello everyone. Time to stop lurking and make my first post. Welcome Quote: (Originally Posted by Captain Calamity) When I look at minimum gas requirement I only really need twin 12s beyond 25-30m - and I don't go that deep often. One option would therefore be to hire twin 12s on those occasions when I really need them, but then what do I do for the shallower dives? ... Finally, would a 10L stage cylinder be a reasonable way to increase my gas reserve on those deeper dives without needing to hire twin 12s? Picking up your last point first, if you took a 10L stage with a single 12 then realistically you're only 2L off twin 12s anyway - with the hassle of a stage instead Granted the twin 12s are going to give you more than enough to cover min gas for most of your shallower dives, but is that a problem? With you and your buddies SAC would twin 12s give you enough gas for a typical day's diving? What about twin 12s with a top up from a 15L in between dives? Personally I've moved from a single tank to twin 12s. I get the extra resilience of a manifolded set, plus they're nice to dive and have more than enough gas for what I do. Depending on the dives I'll either decant from a 15L into them in between dives to cover the second dive, or I'll take a stage (mainly because I'm trying to get used to diving with a stage). I am setting up some regs for a single tank, but that's more for holiday dives where hiring twins might not be an option.