On a single dive, do you run out of air before reaching your NDL?

Join DiveBuddy.com

Meet new scuba divers, maintain a virtual dive log, participate in our forum, share underwater photos, research dive sites and more. Members login here.

Best Vacation Dive Destinations ? Part 3 What most of us can afford $$$$

Best Vacation Dive Destinations ? Part 2

Best Vacation Dive Destinations ? Part 1

Posted in Survey

DiveBuddy Web Server Upgrade

PADI replacement scuba certification card - $40!

DiveBuddy.com Changes - Merge Sections

Posted by Greg

Scuba Forum > Survey

#51878	On a single dive, do you run out of air before reaching your NDL? Greg - 9/09/2014 6:38 AM View Member Topics Category: Survey Replies: 65
	On your first dive of the day, using regular air in an AL 80 tank, do you run out of air before reaching your No Decompression Limit? Regardless of depth, altitude or temperature...leaving at least 300 psi in the tank.

Answer Choices

Anonymous - 11/16/2014 10:27 AM

[Choose #1] I normally don’t last as long as my tank on the first dive.

#302	TMHeimer - 10/26/2014 2:30 PM [Choose #2] I haven’t reached either limit yet.

#310	jnowak100 - 9/26/2014 4:06 PM [Choose #1] for a single tank, I use a steel 120 / 15 ltr tank. but NDL is usually not the limiting factor except on deeper dives.. I am an air hog.

#181	JeffWilsonMT - 9/17/2014 6:10 PM [Choose #2] I dive a 100cf tank in cold water, and when I started diving the air was the limiting factor without a doubt. At about dive 130 that flipped to bottom time being the constraining factor. I recognize that’s not answering the prompt. :-)

#547	joec1 - 9/16/2014 9:19 AM [Choose #2] yes and No, depending on depth. I can do 65’ for 45 min and have half a tank. I think you might need to do graph or something to accurately answer this.

#15843

Brian_V - 9/16/2014 8:55 AM

[Choose #1] ...I mostly dive shallow, so the supply air is what limits the dive.

#2638

John_giu - 9/11/2014 1:05 PM

[Choose #1] considering a 30’ you could stay there all day without NDL? you might need to re-think the question.

#5828

Agojo - 9/10/2014 7:45 AM

[Choose #2] Occasionally use one tank for 2 dives due to deco times, just did Oriskany 126’ with AL80, 28%nitrox and surfaced after 1 min deep and 4 min safety stops with over 1200psi. Moderate current surface to 126’.

#8590

dalehall - 9/10/2014 6:29 AM

[Choose #2] Of course, it depends on depth.. Best time so far is 87 minutes on an AL80. Started with 3000 came up with 380. Depth was 35-48 feet.

#12608

Eric_R - 9/09/2014 5:53 PM

[Choose #1] Regardless of depth really doesn’t make sense to me as it’s the #1 factor. Below 20’ has almost unlimited time. Unless your not going to count a dive that’s below 20’ as a dive.LOL

#50	KMDD - 9/09/2014 5:08 PM [Choose #1] hardly! Give me another few years....or so.

#4083

divingbear - 9/09/2014 4:21 PM

[Choose #2] Depending on depth of coarse, best bottom time yet 2.5 hrs

#109	artabanus4 - 9/09/2014 4:12 PM [Choose #1] DCIEM gives me 150 mins at 40’ - I might get 60 mins of bottom time with an AL80 and exit with ~500 psi at that depth.

#20531

Smithsgold - 9/09/2014 4:01 PM

[Choose #1] I use up that air !!!!

#51878

Greg - 9/09/2014 12:50 PM

[Choose #1] On a single AL80 tank, I have always run out of air before I hit deco limits. On a 40’ dive, I can last about 60 minutes (NDL at that depth is 140 mins) with about 300 psi left.

#748	gemiller - 9/09/2014 8:04 AM [Choose #1] I’m so confused on how everyone is saying "No". I find it unlikely at 40’ you guys are getting 130 minutes of air time on a single 80cf alum...

#11353

JeffQCScuba - 9/09/2014 7:31 AM

[Choose #2] CC - so always run into deco way before running low on gas. Same always held true for OC, but that is because I plan my dives then dive my plan...