On behalf of all of us who watch this i want to thank you for taking the time to put this together, this is the best video on utube i have found, the explanation is fantastic, the idea is to try and understand key concepts before doing some technical diving training and you have nailed it, again thank you
OMG...finally one person to appreciate 😜. Yeah, I know in our fast-paced world, attention spans are short. This used to be my most popular lecture, in conjunction with Nitrox certification or refresher. Anyway, glad you got something out of it 👍 and I appreciate the support and encouraging feedback.
Polyurethane orings are also oxygen compatible. They are standard on Scubapro DIN regs, but are available in most sizes from oring vendors. They tend to be stronger to pressure than viton, but they breakdown under UV light. So they are great for DIN orings, but bad for valve yoke orings.
I may be wrong about this but I was always told that because you metabolize oxygen it has a less narcotic affect when compared to N2. It makes sense to me but I can't find it anywhere on paper. Edit: my narcotic symptoms are weird. I tend to forget that need to inflate my drysuit, or I'll be looking at my computer and think "what does that 16 number represent?" Also FYI if you have a tank of H and O2 as long as the O2 is under 4% things shouldn't explode. Key word "shouldn't"..
I agree with you. Narcotic effect is a combination of solubility and effect of neuro-cellular function. I don't believe that oxygen and nitrogen have the same effect on neuro-cellular function, even if they are dissolved into the cell at the same level.
@@DiscoveryDiversTokyo I've been intrigued by this discussion, so I have been Googling like mad. Best I can tell, no one knows for sure how narcotic oxygen is or how it compares to nitrogen. This is because (a) no one really knows the actual mechanism in the cells that leads to narcosis and (b) if you had test subjects breath 100% O2 at partial pressures sufficient to lead to narcosis, you'd have oxygen toxicity issues (and they'd die if breathing 100% nitrogen). It appears that the "best practice," at current, is to treat oxygen and nitrogen as equally narcotic. Thanks for raising this issue!
Any shop that blends nitrox with any sort of regularity should consider a continuous flow (nitrox stick) blending system, they are cheap to make and allow you to use your oxygen bottles down to less than 20pis, vs having to replace them at 100-400psi if you are using a booster or not. Not having to maintain a booster, and getting more out of your oxygen bottles will add up quickly to pay off the system. And the employee costs of not having to monitor the tanks constantly while filling will bring down the total fill costs.
Good to have some good input on the filling logistics. Remote Japan seems to be all membrane. That is prolly cuz pure oxygen is a rather regulated medical substance here.
The “loop” in a rebreather is the entire pathway the gas travels. So, not just the hoses. It’s a reference to the entire loop gas makes through the system to your mouth, and back through the system.
We know very well why the bends hurt. 😂 Imagine a gas bubble swelling inside your muscle tissues, fat tissues, joints, or other cavities and spaces inside your body. It physically hurts because of swelling. 😁👍🏻
@@DiscoveryDiversTokyo Simplicity and ease of use. The op working depth is still 1.6, but it’s not uncommon to push 2ATA if necessary. There’s no need to go deeper when you’re objective doesn’t require it, and further, if your objective requires a longer distance swim, you want to stay shallow to save gas and reduce saturation. The purpose of combat diving is infiltration and exfiltration. The only times pushing the MOD becomes necessary is if the bottom of a ship is below that (I’ve never seen a draft that deep), or if an imminent threat exists requiring a bounce down and back up. There’s more to it, but that’s the jest of it. There are military divers who do use other types of CCR units, including trimix. EOD guys do, and so do Navy and Army divers who have a need for it. But for combat divers, it’s simply not necessary. O2 CCR’s are standard.
Why not subscribe and follow the evolution of our feed. My best videos are yet to come, I'm sure: th-cam.com/users/DiscoveryDiversTokyo
How did I miss this Jim... Disgusted at myself.. what an amazing talk to listen to on diving gases.. massive thank you.
On behalf of all of us who watch this i want to thank you for taking the time to put this together, this is the best video on utube i have found, the explanation is fantastic, the idea is to try and understand key concepts before doing some technical diving training and you have nailed it, again thank you
Thank you for the kind comment, Chris. Hope to see you around the channel.
#ScubaGold!
Amazing lecture, have been scuba'ing for many years and started to look at the more advanced aspects recently. This really helped ALOT!
OMG...finally one person to appreciate 😜. Yeah, I know in our fast-paced world, attention spans are short. This used to be my most popular lecture, in conjunction with Nitrox certification or refresher. Anyway, glad you got something out of it 👍 and I appreciate the support and encouraging feedback.
@@DiscoveryDiversTokyo looking forward to see more of your wisdom within the field 👌👌
@@glenmariusmanumbakken6755 thank you Glen!!!
Learned a lot. Good info
Glad it was helpful, V! Thanks for taking the time to comment.
Wonderful presentation. Had you been in the vicinity (uae) , I'd have treated you to a beverage. I'd still like to though. Will reach out to you.
Thanks for the support. Yes! Let's treat each other to a beverage someday. Please reach out if you get to Asia 👍
Polyurethane orings are also oxygen compatible. They are standard on Scubapro DIN regs, but are available in most sizes from oring vendors. They tend to be stronger to pressure than viton, but they breakdown under UV light. So they are great for DIN orings, but bad for valve yoke orings.
Thanks for the view and taking the time to make a comment 👍
I may be wrong about this but I was always told that because you metabolize oxygen it has a less narcotic affect when compared to N2. It makes sense to me but I can't find it anywhere on paper.
Edit: my narcotic symptoms are weird. I tend to forget that need to inflate my drysuit, or I'll be looking at my computer and think "what does that 16 number represent?"
Also FYI if you have a tank of H and O2 as long as the O2 is under 4% things shouldn't explode. Key word "shouldn't"..
I agree with you. Narcotic effect is a combination of solubility and effect of neuro-cellular function. I don't believe that oxygen and nitrogen have the same effect on neuro-cellular function, even if they are dissolved into the cell at the same level.
You guys are prolly both right. But I do recall in my training that O2 was about as narcotic. to be fair, I've forgotten tons...
@@DiscoveryDiversTokyo I've been intrigued by this discussion, so I have been Googling like mad. Best I can tell, no one knows for sure how narcotic oxygen is or how it compares to nitrogen. This is because (a) no one really knows the actual mechanism in the cells that leads to narcosis and (b) if you had test subjects breath 100% O2 at partial pressures sufficient to lead to narcosis, you'd have oxygen toxicity issues (and they'd die if breathing 100% nitrogen).
It appears that the "best practice," at current, is to treat oxygen and nitrogen as equally narcotic.
Thanks for raising this issue!
Dived two hundred dives in the last two years. 70% were nitrox (32%). Never felt a difference. Maybe it's just me.
Any shop that blends nitrox with any sort of regularity should consider a continuous flow (nitrox stick) blending system, they are cheap to make and allow you to use your oxygen bottles down to less than 20pis, vs having to replace them at 100-400psi if you are using a booster or not. Not having to maintain a booster, and getting more out of your oxygen bottles will add up quickly to pay off the system. And the employee costs of not having to monitor the tanks constantly while filling will bring down the total fill costs.
Good to have some good input on the filling logistics. Remote Japan seems to be all membrane. That is prolly cuz pure oxygen is a rather regulated medical substance here.
@@DiscoveryDiversTokyo membrane is the way to go it you have the business to support it.
Military rebreathers for combat divers are still 100% O2 to this day.
The “loop” in a rebreather is the entire pathway the gas travels. So, not just the hoses. It’s a reference to the entire loop gas makes through the system to your mouth, and back through the system.
We know very well why the bends hurt. 😂 Imagine a gas bubble swelling inside your muscle tissues, fat tissues, joints, or other cavities and spaces inside your body. It physically hurts because of swelling. 😁👍🏻
Why is that...so shallow.
@@DiscoveryDiversTokyo Simplicity and ease of use. The op working depth is still 1.6, but it’s not uncommon to push 2ATA if necessary. There’s no need to go deeper when you’re objective doesn’t require it, and further, if your objective requires a longer distance swim, you want to stay shallow to save gas and reduce saturation. The purpose of combat diving is infiltration and exfiltration. The only times pushing the MOD becomes necessary is if the bottom of a ship is below that (I’ve never seen a draft that deep), or if an imminent threat exists requiring a bounce down and back up. There’s more to it, but that’s the jest of it. There are military divers who do use other types of CCR units, including trimix. EOD guys do, and so do Navy and Army divers who have a need for it. But for combat divers, it’s simply not necessary. O2 CCR’s are standard.