How To Calculate Gas Requirements | Master Series

In your basic open water training, you might have learned to always surface with a specific amount of gas in your cylinder. But does this truly guarantee a safe ascent? We'll delve into why this method falls short and introduce an approach grounded in real gas requirements rather than guesswork.
Ensuring a safe dive involves considering various crucial factors during dive planning. Gas planning, in particular, emerges as one of the most critical components. While technical divers excel in gas planning, utilizing different gas mixes and meticulously planning decompression stops, it's vital to acknowledge that recreational dives, despite their shallower depths, require effective gas planning for safety.
Join us as we delve into the intricacies of gas planning and its pivotal role in maximizing underwater safety. Discover how to factor in variables like emergency surface air consumption rate and average depth to determine the minimum reserve needed for a safe ascent. Understand the significance of turn pressure and its role in timing the conclusion of your dive.
If you're eager to elevate your dive planning and prioritize safety above all else, this video is a must-watch.
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00:06 The Significance of Gas Planning
01:17 Asacent Strategy
02:58 Minimum Reserve (Rock Bottom)
04:41 Usable Gas
05:15 Turn Pressure
06:32 The Conclusion of Your Calculation
07:14 Tips & Tricks
07:47 The Formulas (Simplified)
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[@flowstatedivers]

Support Us By Subscribing To The Channel! 🔔t.ly/BO7Mx Learn To Calculate Your SAC Rate! kzbin.info/www/bejne/pWfThIN7pbZmiLs

[@MrNeobuxer]

Please don't stop making these videos!

[@flowstatedivers]

we just got started :)

[@chrisogle1168]

Please make more video tutorials they do help to clarify what is taught but not explained. Thanks for the knowledge.

[@Andrea-sp9gj]

Very clear video !

[@brandonsdi]

Brilliant content straight to the point! it really is an eye opener to me after making a tough admission to myself that yeah, I'm 100% of the times relying on the guide. This definitely changed how I will approach my dives from now on. THANKS!!!

[@felixnunez1776]

Another outstanding video, thank you, please keep up the great work!

[@surplusultrazen-lu5nt]

Excellent as always but let's talk about the elephant in the room! How and where we can get those prestigious mask straps ?!?!?! I would be very proud to wear it :)

[@flowstatedivers]

haha ! it's not for sale but you can earn' it ! Details on this coming soon!

[@Jonathannie99]

this is someting to think about. people shout be more awere of theire dives into the deep. keep making this contant

[@Babmajom88]

I was looking forward to this!!

[@PirateDM]

Thanks guys! ))) I really love your content !

[@flowstatedivers]

Glad you enjoy it!

[@brandonsdi]

Bring it on!!!! awesome

[@remcovanhal6336]

Thats me in the video 😁

[@snake310790]

recently did my deep dive course and the same was taught. except we used a slower ascent rate (3m/min) and SAC rate of 20l/min. awesome job! cheers!

[@flowstatedivers]

We are not disputing your knowledge, but remember that a slow ascent rate of 3m/min will likely result in continuous on-gassing at depth. However, it is undoubtedly safer than ascending at rates higher than the standard. If you are interested in this, It's good to spend time on studying the latest results of decompression research

[@snake310790]

@@flowstatedivers im all for learning. you are definitely right that the diver will still be ongassing faster. since we are calculating the minimum reserve gas, 3m/min is really slow. its not what is done normally. but in a scenario where a diver cannot ascend faster, there should be enough air for him and the buddy.

[@sebastien2487]

Great video again illustrating deliberate diving 🙏🏼👍🏻

[@flowstatedivers]

Thanks. That's a great way to describe this approach! :)

[@dassdar]

Always have backup onions to generate more gas with you!

[@Tegneaufreak]

Interesting. In egypt you get a 11l tank with 190bar if you are lucky. Get in the water and it cools to 175bar. So you better do 15 min dives or be in trouble. In reality the dive profile is V shaped with the right side of the V being the longest. Turnaround is at 110 usually. Safety stop at 70ish. But that is then regarded unsafe according to these standards.

[@flowstatedivers]

Well, this depends on the depth, but you can calculate it yourself. The key question to answer when planning your gas supply, regardless of the method used, is whether you can bring two divers to the surface from the deepest point of the dive without exceeding a safe ascent rate and completing all necessary stops while sharing gas.

[@ravidaskirtan9349]

I get the point in the turning pressure, but why not turn while you ascent at the same time so you can save air or prolong the dive?? So you head back with the same route but different depth,, that way you do the ascend while you still enjoy/continue the dive, and can do longer dive/go further before the turn

[@flowstatedivers]

That is called a multi-level dive, and calculating such a plan involves a bit more than what was discussed in the video. We will delve further into different types of dive planning shortly, where this topic will be covered in greater detail.

[@DroPsyDro]

Exactly what I learned. BUT: I encourage all to measure their SAC rate while "working" under water. My rate swimming against a light current already is around 35l/min. If I or my buddy loses all of his gas, I garanty you I will panic and and breathe waaaay over that.

[@MrNeobuxer]

Yep, you are absolutely right. But it's a bit unrealistic to convince most people to keep an eye on and constantly measure their pressure-based SAC (unless you have a good air-integrated computer that calculates it for you instantly). On the other hand, you can't really anticipate what your PSAC will be if you panic, panic ain't good, you got to target the panic bro (or sis)

[@DroPsyDro]

​@@MrNeobuxer of course you shouldnt panic. But in my opinion a rock bottom gas analysis should consider the worst case szenario. In this scenario, at least one diver is realy stressed out or panicing.

[@DroPsyDro]

​@@MrNeobuxer and I find it relaxing to know that I even planned for panicing - with lowers the probability to panic.

[@MrNeobuxer]

@@DroPsyDro@DroPsyDro Yep. You should plan as conservatively as you feel will keep you safe. There is a limit, though, on how far you want to go before you realise that you're not really enjoying diving. So best to work on the root causes - comfort under water and calmness while doing skills, better breathing habits and good SAC, confidence in gear setup and familiarity, etc. Enjoy your dives bro!

[@DroPsyDro]

​@@MrNeobuxer thanks, you too!

[@MCLuviin]

How did you guys know i have been writing out my next dive plans the last 2 hours 😂😂😂😂😂

[@skydiverninetysix]

Very helpful video. Can you explain how you get "average depth"?

[@flowstatedivers]

Since you calculate the required amount of gas to safely surface 2 divers from the deepest point of the dive you calculate the average depth from the maximum depth. In our example the max depth was 30 meters so you divide that by 2 and ending up with 15m avg where the pressure is 2.5b ATA.

[@rambling_wreck]

I stumbled on this point as well. You’re calculating an average which does not incorporate time at depth. A time-weighted average depth would yield a more accurate, if less conservative, average depth for estimating air consumption. Is the calculation intentionally conservative or intentionally simplified, and are there other trusted methodologies which employ a time weighted average depth? Thanks for these videos, the content is very well presented.

[@skydiverninetysix]

@@rambling_wreck actually I think that the method presented in the video is MORE conservative because its running total ascent time at the total average. I ran the numbers using average time at the average depth for the ascent portion to SS depth, the time spent at SS, and the time spend for the ascent from SS to surface and came out with a lower estimate, due to the fact that the time spent at SS stop and ascent from SS to surface use much less gas. The numbers are close though

[@rambling_wreck]

@skydiverninetysix, I think we’re saying the same thing. I asserted that a time weighted average would be less conservative, you asserted that the method in the video is more conservative. Thanks for running the numbers, haven’t yet had a chance to do so yet. Glad to hear the difference is small.

[@flowstatedivers]

​@@rambling_wreck The video showcases a more conservative approach than the time-weighted average. The real advantage of this method is that it allows you to create your dive plan before the dive, rather than having to make calculations while diving. It's a well-established fact that math and diving don't mix well (even in very simple cases like this). This becomes even more crucial when carrying out planned decompression, so we suggest not calculating on the fly but having a plan and contingency in place, then go and execute that plan.

[@felipemesquita2940]

Awesome> Greetings from Brazil!

[@yungteach]

Appreciate the video but the way the number 1's are drawn is confusing.

[@flowstatedivers]

Are you American?

[@yungteach]

Fortunately not @@flowstatedivers though looking at the number 1 in '155b' at timestamp @6:22... the 1 looks like a wonky upward arrow ^ and actually some of the lowercase b's look like the number 6.

[@flowstatedivers]

@yungteach well... I'm glad you figured it out at the end.

[@L.L]

18 meters +\-3 meters a minute accent rate.. Save a lot of time that way

[@flowstatedivers]

Yeah you save time and greatly increase the risk of not off-gasing sufficiently + make the surface interval mandatory in between dives so is it truly worth it?

[@L.L]

@@flowstatedivers all my dice have been done that way and never had issues. Actually I put +\-3 but it is 18 meters a minute or slower. Even my 300 foot dives are done that way with proper deco. Even do 230 feet dive for 7 minutes straight up to the surface no deco at that rate not saying it is the safest but in case of emergency you will live. (On HEO2.)

[@cinqrock]

I agree with all, however must of the scuba diver now are consumer of scuba diving and not "autonomous scubadiver'. Meaning that they follow a professional who will manage the dive profil. So my feeling is this video is for advance or passionate diver who by them experience and desire have a better buoyancy and breathing control. So in your exemple the RMV could be 20l/min, and 35l/min for the ascent (stress related to emergency)Thank for the video. Regards

[@flowstatedivers]

Indeed, all our videos are designed for certified divers who are committed to diving responsibly. We believe that diving is inherently dangerous, and we reject the "I'm just a consumer" mentality. Our goal is to raise awareness and promote an alternative approach for divers who strive to be conscientious and self-aware. On the other hand, based on our extensive experience in the scuba industry, we recognise that many so-called professional dive guides often lack the proper mindset and knowledge. We believe it is crucial for every diver to think critically rather than simply follow someone and hope for the best outcome.

[@stevenmcferrin9348]

@@flowstatediversAs a highly trained skydiver who has been scuba diving for 2 years now I appreciate what you are trying to accomplish here. It makes me very nervous how lightly “recreational” divers take the risk involved in this sport. For this reason I have not been comfortable with most “Dive Buddies” being responsible for my alternate air. I appreciate that you stress that it’s up to each diver to be responsible for their own knowledge and safety when diving. Thanks for the great content.