Why use doubles?

[El Orans]

If a set of doubles contains the same volume of gas as a single tank with the following set-up, what would be the DIR reason to use doubles?

 

[24940]

Redundancy and stability.

 

[Jimmer]

You do not have true redundancy there. If the tank neck O-ring were to extrude, your entire gas supply is compromised.

 

[mksmith713]

If each tank were filled identically,a single wouldn't have the same volume of gas as doubles of the same size.

 

[sheck33]

Redundancy and stability.

what he said.

 

[El Orans]

Redundancy and stability.

I find that my stability is a lot better when I dive a drysuit than my regular wetsuit.

Since this set-up is not meant for overhead diving, I feel comfortable not using doubles.

If each tank were filled identically,a single wouldn't have the same volume of gas as doubles of the same size.

15L or 2x7L would be quite comparable.

 

[radiocraig]

to look cooler on the beach

 

[RJP]

If a set of doubles contains the same volume of gas as a single tank with the following set-up, what would be the DIR reason to use doubles?

FIRST: your question contains a faulty premise by specifying "a set of doubles containing the same volume as a single tank" unless you're talking about a set of AL40's doubled up.

SECOND: An H-valve is only redundant from a reg-failure standpoint. It merely provides redundant ACCESS to the relatively small volume of gas contained in a single tank. It does not provide a redundant gas SUPPLY that doubles offer in a situation requiring air-sharing. Particularly important in overhead dives, including deco.

 

[24940]

SECOND: An H-valve is only redundant from a reg-failure standpoint. It merely provides redundant ACCESS to the relatively small volume of gas contained in a single tank. It does not provide a redundant gas SUPPLY that doubles offer in a situation requiring air-sharing. Particularly important in overhead dives, including deco.

Take a closer look at the pic. That's not a H.

Edit: ehm... yes it is.

 

[El Orans]

FIRST: your question contains a faulty premise by specifying "a set of doubles containing the same volume as a single tank" unless you're talking about a set of AL40's doubled up.

I specifically wanted to exclude the argument "to carry more gas".

If I were to use a set of doubles locally, I'd use 2x7L, 2x12L is too much for my current purpose.