dual tank
- Thread starter mikemikemike
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Blackwood
Contributor
Mainly 'cuz it looks cool.
captain
Contributor
Doubles have become to be considered tech equipment for redundancy and decompression dives but I have several sets of doubles that are equipped with single outlet manifolds for only one regulator. I can do two and possibly three non deco rec dives without the hassle of switching regulator and BP/ wing from one tank to another.
Yeah these were common in the *cough* previous generation. I've seen sets like this but ended up wondering if those were scuba tanks or fire extinguishers 
Just kidding. I still see some divers using this stuff but it's getting less and less common.
I think it's safe to say that in terms of scuba evolution, the single reg manifold is on the path to extinction. Historically I'd say it had a place as long as dual hose regulators were the norm, but these days it's ...well... a bit of an enigma.
R..
Just kidding. I still see some divers using this stuff but it's getting less and less common.
I think it's safe to say that in terms of scuba evolution, the single reg manifold is on the path to extinction. Historically I'd say it had a place as long as dual hose regulators were the norm, but these days it's ...well... a bit of an enigma.
R..
captain
Contributor
Yeah these were common in the *cough* previous generation. I've seen sets like this but ended up wondering if those were scuba tanks or fire extinguishers
Just kidding. I still see some divers using this stuff but it's getting less and less common.
I think it's safe to say that in terms of scuba evolution, the single reg manifold is on the path to extinction. Historically I'd say it had a place as long as dual hose regulators were the norm, but these days it's ...well... a bit of an enigma.
R..
Actually the single outlet manifold is still in production by Aqua Lung, used by military and commercial divers.
Simple question but many answers. Anyway, you're welcome
DaleC
Contributor
I solo dive quite often and (in the past) used a pony bottle for redundancy. However, I found I was often gas limited on my dives and did not want to use my pony to extend my dives so I now dive independant twins in order to extend bottom time plus provide adequate redundancy. I currently dive recreational profiles.
electric_diver
Contributor
There are several reasons. However the most important is bringing a larger amount of breathing gas with them on the dive.
The next question is why would someone want more breathing gas? The usual answer is that they are staying longer and invoking either a real or virtual overhead environment and require redundancy. Typically divers who are doing "technical" dives use rule of 1/3rds. That is 1/3 of gas in, 1/3 of gas to get out and 1/3 of gas in reserve. Divers doing that kind of dive plan and calculate how much gas is required. For example a diver might calculate that to do a dive he needs 50 cubic feet of gas to go in and 50 cubic feet of gas to go out. That means he needs 50 cubic feet of gas for reserve. He thus requires 150 cubic feet of gas total. Scuba tanks are typically 80 to 120 cubic feet. So to do that hypothetical dive the diver requires two tanks.
Note that I wrote breathing gas not air. Divers doing these kinds of dives may use breathing mixtures other than air.
The next question is why would someone want more breathing gas? The usual answer is that they are staying longer and invoking either a real or virtual overhead environment and require redundancy. Typically divers who are doing "technical" dives use rule of 1/3rds. That is 1/3 of gas in, 1/3 of gas to get out and 1/3 of gas in reserve. Divers doing that kind of dive plan and calculate how much gas is required. For example a diver might calculate that to do a dive he needs 50 cubic feet of gas to go in and 50 cubic feet of gas to go out. That means he needs 50 cubic feet of gas for reserve. He thus requires 150 cubic feet of gas total. Scuba tanks are typically 80 to 120 cubic feet. So to do that hypothetical dive the diver requires two tanks.
Note that I wrote breathing gas not air. Divers doing these kinds of dives may use breathing mixtures other than air.
Anti-Hero
Contributor
Exactly! I did it for the chicks.
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