masonak1298
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How many of you dive with double tanks. And do you advice it for deep diving.
Doubles 80's Question
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i won't dive alum 80's out here
I dive single and double tanks.
The advantages of doubles: More gas, to allow both a good rock bottom and a good dive. Redundancy in the event of a failure.
The disadvantages: Significant cost. Significant increase in difficulty of simply managing the gear -- They're heavy, hard to lift, harder to walk in, make gearing up on a pitching boat much harder. Increased complexity -- assuming you are using an isolation manifold, you have to understand how it works, and what to do in the event of a failure. More failure points -- lots more o-rings and connections.
For deeper diving within the recreational range, having a good understanding of gas planning and gas management, and having a good buddy with well-honed team skills is probably just as useful, if not more so, than going to double tanks. Once you lose the ability to go directly to the surface, the redundancy begins to outweigh the disadvantages. JMHO.
The advantages of doubles: More gas, to allow both a good rock bottom and a good dive. Redundancy in the event of a failure.
The disadvantages: Significant cost. Significant increase in difficulty of simply managing the gear -- They're heavy, hard to lift, harder to walk in, make gearing up on a pitching boat much harder. Increased complexity -- assuming you are using an isolation manifold, you have to understand how it works, and what to do in the event of a failure. More failure points -- lots more o-rings and connections.
For deeper diving within the recreational range, having a good understanding of gas planning and gas management, and having a good buddy with well-honed team skills is probably just as useful, if not more so, than going to double tanks. Once you lose the ability to go directly to the surface, the redundancy begins to outweigh the disadvantages. JMHO.
Benthic
Contributor
What do you mean by deep? If you mean between 60-130fsw then you will likely find lots of people diving both configurations. It will depend on what they're doing. As you get down to 130-200fsw, you'll still see both, but doubles will become much more common. Below 200fsw, you'll see doubles almost exclusively. The exception to this would be rebreather divers. You'll find them all over the place because, in most cases, when one switches to RB they dive RB all the time.
As you progress in your dive training and move toward advanced nitrox, deco procedures and trimix, all of the certification agencies that I know of will require that you dive doubles. Adequate gas planning just cannot be done with a single tank. If this is the path that you are thinking of, then double aluminum 80s would be a good place to start. They'll work just fine for you for a long time. They are not the ideal tanks for every situation, but they are certainly serviceable. They are also the least expensive way to get into a set of double tanks.
Brian
As you progress in your dive training and move toward advanced nitrox, deco procedures and trimix, all of the certification agencies that I know of will require that you dive doubles. Adequate gas planning just cannot be done with a single tank. If this is the path that you are thinking of, then double aluminum 80s would be a good place to start. They'll work just fine for you for a long time. They are not the ideal tanks for every situation, but they are certainly serviceable. They are also the least expensive way to get into a set of double tanks.
Brian
fire_diver
Contributor
doubled AL80s? Go for it. Great, cheap, intro doubles set. You can explore deeper than most single tanks, and get used to using doubles before moving up to big doubles like twin 120s.
Just remember; training, experience, SAC, total gas volume, and rock bottom all are needed before just drifting on down to anything "really deep"
FD
Just remember; training, experience, SAC, total gas volume, and rock bottom all are needed before just drifting on down to anything "really deep"
FD
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