Why isn't there a tank valve-open marking?

[diver0008]

why isn't there some universal labeling standard to show which way to turn a valve on?

Possibly because it's unnecessary. Pretty basic task. make sure you have air.

 

[KeithG]

righty tighty, lefty loosy...

AND: A question for those AI peeps. My old fashioned mechanical SPG needle swings real fast when I do a few test breaths. What happens if you are using a new fangled electrical AI system? Does it respond fast enough...

 

[RainPilot]

righty tighty, lefty loosy...

AND: A question for those AI peeps. My old fashioned mechanical SPG needle swings real fast when I do a few test breaths. What happens if you are using a new fangled electrical AI system? Does it respond fast enough...

Great question, I never thought of that! Another reason not to turn back 1/x turn then....

 

[Storker]

A question for those AI peeps. My old fashioned mechanical SPG needle swings real fast when I do a few test breaths. What happens if you are using a new fangled electrical AI system? Does it respond fast enough...

Darned good question. I've always assumed it does, but I've never actually checked.

Time for some experimentation, methinks. Will report back when I have time to do the test.

 

[Patoux01]

I doubt it.They could if the programmer thought it through, but the update rate is most likely somewhere below 1Hz (wild guess). Happy to be proven wrong.

 

[Neilwood]

If I ever go AI I will probably go for having an SPG as well as a backup for the event of a connection failure.

It would be the SPG I would use for the breath check.

 

[lermontov]

look at the needle if it reads 0 -turn the valve -needle goes up - keep turning till knob stops - you have air

 

[Bob DBF]

Pretty basic task. make sure you have air.

Yeah, I never had a problem with that, even back before I was using an SPG. It's all about focus.


Bob

 

[Patoux01]

I've always been dubitative about that "breathing check". I see people do it religiously, much like the "breathe the regs before diving" (you keep seeing it in all the PADI stuff, and yet it does not work, it will not tell if you'll be able to use it underwater), but I'm still not confident it works.

So I just went to my room, grabbed one of my regs, went to the garage, grabbed one of my tanks and shot these 2 videos... Don't mind me sniffling, I have a cold. The fast reg noise is me breathing fast, the longer ones are when I fully depress the purge button. These regs are "high perf" regs (dive rite XT1 and XT2), so I'd put them out of the equation if anyone wants to find a reason like "that's because your second stage wont draw enough air" or something like that. The membrane was a bit sticky due to storage, that's the weird noise you hear at the beginning when I take a first breath.
What do you guys think (not about how tidy my garage is )?



Sorry youtube decided to flip one of the videos over.

One can argue that "the needle is moving!", but noticing it with the sun on your spg and on a rocking boat? I know I wouldn't.

 

[AfterDark]

One can argue that "the needle is moving!", but noticing it with the sun on your spg and on a rocking boat? I know I wouldn't.

Then you need to shield it from the sun, focus more, in short make it your business to see it.

I've gone over the side with a closed valve once because I lost my focus. I got my rig ready, tested then shut the valve off. After an hour boat ride to the site I donned my rig and rolled over the side with the valve closed. Had to doff the rig to turn the valve on. I can't reach my valves after 2 rotator cuff operations.

Diving is not the kind of activity that is forgiving of those that lose their focus.