Strange event, no air

[boulderjohn]

@boulderjohn What's a dip tube? I'm not familiar with the term and am struggling to imagine what component failure could cause water to flow into a full tank

A dip tube is a small tube about 2 inches long that attaches to the opening of the valve inside the tank. It's purpose is to prevent what happened in that event--if there is water or débris in the tank, it will not block the opening.

What causes water in a tank? There is a myth that running pressure low on a tank during a dive will do it, but that is not true. It mostly happens because of careless tank filling operations.

 

[Nemrod]

Only pic I have available at the moment. This is a scba valve, not a scuba valve, but the tube is the dip tube:



Some are pinched shut on the end and then there are two holes cross drilled. Different variations. The purpose is to prevent anything in the tank from entering the valve and regulator.

 

[Nemrod]

I admit to breaking the cardinal rule, keep buddy close, and especially now three years past my event on the Jupiter Deep Ledge, where I came to institute a new rule for me of several new rules, either rig for solo or keep my buddy in hand. I let my buddy wander off too far. It was a night dive, like most they turn into a cluster ------ when another group bombs your group and everybody gets confused. That is what got my buddy off from me, that and the critter who was so desiring a photo taken .

It was a shallow dive, I was never scared, no panic, just mostly annoyed. Well, a lot annoyed! And mostly annoyed at myself for breaking my rules.

 

[tursiops]

does not Padi and many recommend 30 fpm for ascent above 30 feet

Not really. What PADI says is do not exceed 60 ft/min, and if you have a computer, do what it says. PADI also points out (in its Encyclopedia of Recreational Diving) that safety stops are far more effective in reducing bubble scores than is using slower ascent rates above 60 ft. So spend your 3-5 minutes at 15 ft instead of going 30 ft/min to the surface; the latter doesn't hurt, but it is of far lesser value than the SS.

 

[rick00001967]

"does not Padi and many recommend 30 fpm for ascent above 30 feet?"

unless things have changed since i stopped teaching, ssi recommends 30ft/min.

imho...even if padi or anyone else recommends 60ft/min, you should always do a safety stop (unless it is an emergency) and always reduced your ascent rate as you get shallower (above 30ft).

personally, after my 3 to 5 min stop (hopefully closer to 5 - yes i am usually the last onboard) i try to ascend as slowly as i possibly can. i see too many divers who do their stop and then rocket to the surface.

 

[JoeTPhilly]

Do we have to put a check in the DIN "pros" column on this one?

 

[Imla]

Question: What was your rationale for not going straight to the surface when you had two failing regs? If you are not breathing, you are not really offgassing either, so a safety stop is neither effective nor warranted? Wouldn't the safer option be to surface sooner?

 

[Nemrod]

Do we have to put a check in the DIN "pros" column on this one?

DIN regulators have a sintered filter just as does a yoke. They also have dip tube on the tank. Not sure DIN would be immune to such disorders, maybe a little less so.

 

[arkstorm]

DIN regulators have a sintered filter just as does a yoke. They also have dip tube on the tank. Not sure DIN would be immune to such disorders, maybe a little less so.

I think what is meant here is that with a DIN valve, the o-ring stays with the regulator not the valve, so you are in control of maintaining it in a good state of repair.

 

[Eric Sedletzky]

Wow! Glad you’re OK.
That’s something to take into consideration when not using your own tanks. I only dive locally with all my own stuff so something like that wouldn’t be an issue, but if and when I get to go to somewhere warm and tropical I shall make a mental note of that.
Thank you