Ops requiring AOW certs?

[Marie13]

How can she not see now? That's about as close to drawing somebody a diagram as a situation can get.

On a Rainbow Reef Dive Center boat out of Key Largo back in 2013, we were headed out to do a deep wreck morning dive. 2 Guys, young & fit looking, were on the trip. Somehow, it became known after we were out to sea that they only had OW, not AOW. The Captain offered to look at their log books, but they didn't have those. They had to sit out that dive.

How many people carry their log books on dive boats? A log book with substantial history takes time to fill out. Who wants to pack one around, much less on a boat with salt water spray, etc...?

Richard.

Some people have thick heads and just don't get it.

 

[boulderjohn]

I was thinking about this thread, and it occurred to me what when a lot of people are saying, "You don't need additional instruction to dive well," What they are really saying is "You don't need additional instruction to dive like me."

It also occurred to me that they are probably right.

 

[Storker]

I was thinking about this thread, and it occurred to me what when a lot of people are saying, "You don't need additional instruction to dive well," What they are really saying is "You don't need additional instruction to dive like me."

It also occurred to me that they are probably right.

*golf clap*

 

[northernone]

<nitpick>
I wasn't talking about superheating. In superheating, a liquid is still a liquid above its BP. I was talking about the BP/pressure relationship.

At 640F, water boils at ~220 bar (3185 psi).. So, if you have liquid water at 640F, the pressure is at least 220 bar. Which, AFAIK, is more than the pressure inside a freshly filled Al80.
</nitpick>

And 220 bar is about 2200 meters, or roughly 7200 feet.


Me, too. I think you'd struggle a bit with a standard trimix cert as well.

<nitpick, because why not>
We're talking the same thing but one of our rough math estimates is off.

---- academic excellence demonstrated by referencing Wikipedia-----
Superheated water is liquid water under pressure at temperatures between the usual boiling point

This is distinct from the use of the term superheating to refer to water at atmospheric pressure above its normal boiling point
---------

Best I can figure for pure water we're talking 165 barr for 640°f?

<nitpick ending>


Reflecting on the thread, I have an offer.

To the heavily experienced and yet not a padi AOW divers, I'd be honored to offer the AOW course one on one at material cost if it would be any use to you. I'm traveling extensively during the winter and would love an excuse to see some new dive locations.

Serious offer to any diver with let's say, 1000+ dives.

Told my mother about the thread,,she isn't interesting in diving with an operator who cares what card she carries. Still won't do her AOW.

Regards,
Cameron

 

[KeithG]

and strangely enough this thread has stayed on topic?

 

[Storker]

<nitpick, because why not>

We're talking the same thing but one of our rough math estimates is off.

---- academic excellence demonstrated by referencing Wikipedia-----
Superheated water is liquid water under pressure at temperatures between the usual boiling point

This is distinct from the use of the term superheating to refer to water at atmospheric pressure above its normal boiling point

Screw (pardon the French) Wikipedia. Science and engineering is my turf, and on that turf "superheated" specifically means "above the boiling point, but still liquid because weird stuff". Alternatively, "as vapor, above the boiling point at the given pressure" (the latter specifically referring to steam). "Saturated" means "at the boiling temperature and pressure".

and strangely enough this thread has stayed on topic?

It has? Wow. I didn't notice that.

 

[Saniflush]

and strangely enough this thread has stayed on topic?

I can solve that.....

 

[Doby45]

and strangely enough this thread has stayed on topic?

 

[dberry]

<nitpick, because why not>

Screw (pardon the French) Wikipedia. Science and engineering is my turf, and on that turf "superheated" specifically means "above the boiling point, but still liquid because weird stuff". Alternatively, "as vapor, above the boiling point at the given pressure" (the latter specifically referring to steam). "Saturated" means "at the boiling temperature and pressure".

What Storker said. Wikipedia is more often correct than wrong, but in this case it's wrong. "superheated" specifically refers to a non-equilibrium situation... such as water above the normal boiling point but NOT at a higher pressure. For example, water heated in a microwave oven in a very clean, new mug can be at 1 bar but temperature > 100C. This is very unstable (super heated), and can violently achieve equilibrium by suddenly doing what it really wants to do - turn into steam. But in a sealed container you can heat liquid water much higher if the pressure builds up. It's still in equilibrium, and not "superheated".

Nitpicking - it's what us academics do.

 

[northernone]

What Storker said. Wikipedia is more often correct than wrong, but in this case it's wrong. "superheated" specifically refers to a non-equilibrium situation... such as water above the normal boiling point but NOT at a higher pressure. For example, water heated in a microwave oven in a very clean, new mug can be at 1 bar but temperature > 100C. This is very unstable (super heated), and can violently achieve equilibrium by suddenly doing what it really wants to do - turn into steam. But in a sealed container you can heat liquid water much higher if the pressure builds up. It's still in equilibrium, and not "superheated".

Nitpicking - it's us academics do.

Thanks guys! I like this stuff but despite having a high school certificate I lack experience to apply the knowledge when needed. Annoying Wikipedia is badly wrong too, as you've explained those are vastly different states.

How's that for bringing this conversational eddy back into the main steams!

Cameron