The difference between manifolded, modular, and right hand valve doubles

[divezonescuba]

 

[grantctobin]

From^video

 

[PfcAJ]

“When manifolded doubles are not available, are too costly, or logistically inconvenient, or dangerous to use, you have options.”

Yup. Option Number 1.

 

[Wibble]

“When manifolded doubles are not available, are too costly, or logistically inconvenient, or dangerous to use, you have options.”

Sidemount or rebreather?

Dive with a collection of stage cylinders (with the right gas)?

Single with pony?

 

[Manatee Diver]

“When manifolded doubles are not available, are too costly, or logistically inconvenient, or dangerous to use, you have options.”

Yup. Option Number 1.

Sidemount or rebreather?

Dive with a collection of stage cylinders (with the right gas)?

Single with pony?

Every 30 minutes the DM tosses a tank at your bubbles. You catch it, change your reg over from another tank, and send the used one up.

 

[wedivebc]

I disagree that one tank needs to be revered. What emergency requires the shutdown of the valve. other than the dangerous situation caused by reversing the valve and leaving the 1st stage vulnerable?
Why is it more dangerous to dive independent doubles, you said because more training is required but that doesn't explain why it is dangerous? In fact having completely independent gas supplies make the system safer as no single failure can render you out of gas.

 

[tursiops]

I disagree that one tank needs to be revered. What emergency requires the shutdown of the valve. other than the dangerous situation caused by reversing the valve and leaving the 1st stage vulnerable?
Why is it more dangerous to dive independent doubles, you said because more training is required but that doesn't explain why it is dangerous? In fact having completely independent gas supplies make the system safer as no single failure can render you out of gas.

And, he said it's a personal choice which of the two right-handed tanks you reverse. That sounds like he is happy with having one of the valves to the inside, in which case why not have it be the left tank (on the diver's left) so that both regs are facing forward?

 

[Wibble]

The old argument for independent non-manifolded doubles is that you turn on both valves at the surface and in the event of a burst hose you simply switch to the working side and surface on that.

Failing to turn your gas on on the surface results in death by drowning as you struggle to reach your valves because you failed to practice your shutdow drills (and ignored your pre-dive checklist).

 

[Wibble]

Then there’s surface supply— hey man, have a toke on this hookah…

 

[rjack321]

“When manifolded doubles are not available, are too costly, or logistically inconvenient, or dangerous to use, you have options.”

Yup. Option Number 1.

Sidemount or rebreather?

Dive with a collection of stage cylinders (with the right gas)?

Single with pony?

You can skip the dive...

This video is like a rationalization to go back to the 1990s or something. Any land based or charter operation competent and prepared enough to actually support technical diving has doubles for rent nowadays.