Air consumption?

[The Kraken]

AL80 = 80 cubic feet volume tank constructed from Aluminum

HP100 = 100 cubic feet volumet tank constructed from steel and designed to acommodate a higher pressure level to get a larger volume of diving gas in a physically smaller tank.

the K

 

[N² - O² diver]

A gues my question was wrongly formulated.
Because i'm already famyliar with those difference between steel and Aluminum.
Is there a list to compare the cubic feet with L for the tanks ?

Or what a should do for the conversion ?

Just would like to now what you guys are talking about when the cubic numbers rising again
And for the future, so a could explain those.

Thanks again.

 

[sschlesi]

Is there a list to compare the cubic feet with L for the tanks ?

Or what a should do for the conversion ?

Check out the imperial specs for the common Worthington cylinders at

XS Scuba Worthington Steel Cylinder Specifications

There is a link on that page to metric specs which will allow any easy comparison.

 

[Displacement]

836L approx.

Hi Saspotato
Did you calculate this using Haldane's table or is there another reference for SAC in scuba? The consumption rate you have used equates to Haldane's value for a person walking at 3kph which I assume would be close to that of a leisurely swim.

I am a scba operator keen on getting into recreational diving and having read this thread it appears that the basic principles of air management (exluding decon etc.) are very similar.

Cheers
John

 

[MXGratefulDiver]

.....

 

[Displacement]

.....

Mate, I'm not sure but I think that when you posted "........." you meant "what a F#$^% Wit." If that's right, it is pretty sad. I thought this was a forum where people could ask some dumb questions and get a straight answer from experienced people willing to promote the sport. Maybe I am wrong and the newbies forum is a place for people to demonstrate just how much they (think they)know?

By way of further explaining my question, I am a professional fire fighter and scba trainer/assessor. The OP asked a simple question regarding air consumption and Saspotato gave a simple answer in terms of volume of air consumed for a dive of a particular duration at a particular depth. The response given made sense to me in relation to my scba knowledge and the rates of air consumption described in Haldane's table. I simply enquired as to wether this was the case.

I know nothing about scuba but have a high level of technical knowlede of scba in a fire fighting context. My question was merely an attempt to correlate that technical competence with the rules governing "gas management" in the scuba context. Once again I am very interested in learning to dive but know nothing about it, hence my question.

If this isn't the place to ask some dumb questions please let me know..... maybe I got it wrong.

Cheers
John

 

[The Kraken]

Yep, John,

This is the place to ask.

And there is no such thing as a dumb question.

the K

 

[Peter Guy]

John, I have no idea what NWGD first wrote in his post -- but I don't see an issue with "...." SINCE HE WROTE THE REASON HE DELETED THE CONTENT WAS THAT HE THOUGHT HE WAS ANSWERING ANOTHER THREAD!!! (See "reason for editing")

Now it may be that his original post was "not appropriate in tone" for this forum -- but at least give him credit for withdrawing his post!

To the best of my knowledge one can not delete a post so he did the next best thing.

Geesh -- pretty thin skinned?

 

[johnny-on-the-spot]

You can put tables and charts up there all day. But it all depends on your work load. If your sitting on the bottom at 30 ft and just watching the fish. then you will probaly get an hour out of the standerd 80 cf tank if you are a new diver and relaxed not breathing hard. If you are fighting a ripping curent and the vis is low and you lost your buddy. your going to get alot less.Count on it

 

[The Kraken]

That's why a SAC rate is pretty much a piece of historical diving data. It represents the air consumption based upon one dive and one dive only.

But what a diver can do is take that historical data and apply it to an upcoming dive that presents the same characteristics of previous dives.

The thing about using the RMV is that one must take the time to calculate that during a dive. My computer tells me how much dive time I have on the tank given my CURRENT gas consumption. No need to do superfluous calculations.

In my basic opinion, one's SAC rate is, at best, a planning tool.

And, as Forrest Gump so eloquently stated, "That's all I got to say 'bout that."

Let's go diving.

the K