80cu Tank at 800 Feet ????

[speedyal]

This just has "hold my beer & watch this" written all over it, LOL

Why do you say that ?

 

[speedyal]

Some rough math tells me at a descent rate of 60fpm to 800' at a fairly good sac of 0.5 you'd breathe an alu 80 down to nothing somewhere around the 700' mark.

But that would mean that you're total deco obligation would be shorter, so that's a plus.

VI

the question as though how long will it last at 800 let me know what you think and your math behind it

 

[speedyal]

Many tech divers I know use much faster descent rates than that, some up to 3 times faster if they're using a DPV.

If you dont mind explaining whats dpv thanks man

 

[Cave Diver]

If you dont mind explaining whats dpv thanks man

Diver propulsion vehicle or scooter. Some of the higher end ones travel ~200' per minute.

 

[ianr33]

IIRC, Joel ([user]JS1Scuba[/user]) did a test of HP and LP hoses at various depths and published the results here a few years back.

I think you're getting confused. It was Curt Bowen on TheDecoShop that did the hose tests The Deco Stop

Joel Silverstein is the guy that recently found the bell from the Doria

 

[speedyal]

I think you're getting confused. It was Curt Bowen on TheDecoShop that did the hose tests The Deco Stop

Joel Silverstein is the guy that recently found the bell from the Doria

YouTube - Cutting a Scuba Divers Regulator Hoses

^^^^^ SO DID THESE GUYS^^^^^

 

[Cave Diver]

I think you're getting confused. It was Curt Bowen on TheDecoShop that did the hose tests The Deco Stop

Ah yes, I think that is the one I was thinking about, although I would have sworn it was Joel. (Sorry Curt!)

Joel Silverstein is the guy that recently found the bell from the Doria

Lets not open up that can of worms!


There was also a thread here on the subject about the same time: http://www.scubaboard.com/forums/basic-scuba-discussions/46984-how-long-freeflow-empty-tank.html

 

[Cave Diver]

I think you're getting confused. It was Curt Bowen on TheDecoShop that did the hose tests The Deco Stop

Joel Silverstein is the guy that recently found the bell from the Doria

For those of you who aren't members of TDS, here's an excerpt from that post in 2004:

Divers


Here is a little test I did at Eagles Nest cave on Feb 12th for a small article to be placed in issue 17 of Advanced Diver Magazine.

The question I wanted to answer was:

How much time would it take to empty a full aluminum 80 cuft cylinder from 3000 psi to 0 for the following situations and would depth affect the times.

1. Failed Burst Disk
2. Failed HP Hose
3. Failed LP Hose
4. Free Flow high performance regulator 2nd stage.

I completed the test on the surface (0 feet) with 4 aluminum 80’s and a Zeagle D50 regulator.

Here are the results

1. Failed Burst Disk = 72 seconds
2. Failed HP Hose = 22 minutes
3. Failed LP Hose = 83 seconds
4. Free Flow High Performance Regulator = 255 seconds


I then repeated the test at 4 atm’s / 99ft

1. Failed Burst Disk = Same within a second or 2
2. Failed HP Hose = Same within a minute
3. Failed LP Hose = Same within a second or 2
4. Free Flow High Performance Regulator = 155 seconds

<snip>

For the rest of the information, see the post located here: ADM Failure TEST

And just for grins, my report back on how long it took to shut down valves in the event of a failure:

Right Post - 6 seconds

Left Post - 11 Seconds

Isolator - 9 seconds

 

[Jax]

Super - those are the stats quoted in the SSI Solo Diver manual.

 

[Wayward Son]

Why do you say that ?

it's a joke.

What's a rednecks last words?

Hold my beer & watch this!