Messed up and ascended like a missile

[DandyDon]

Any ideas how to nicely tell people not to post anything until they have read through the whole thread?

Just tell them.

 

[boulderjohn]

For reasons I do not understand he went to the top of the boat.

My guess? He was taught to clear his mask while kneeling on the bottom of a pool, and that is the only way he has ever done it. He had to find a solid surface on which to kneel.

 

[boulderjohn]

You must be confused about bar vs psi. How were you measuring your pressure?

or it could be bar?

That's bars

forgive my noobiness then, all air readings are in bar it seems

210-220 will have to be bar, if it is psi you are gettin ripped off. One bar =14.7 psi, so 210bar = 3087 psi, which is a normal fill in most places. Most places that use metric will have spg in bar

That's a BAR reading, for a full tank.

This *can't* be right. This has got to be BAR, not PSI. Are you from europe?

Calm down and read the thread... yes, bar not psi.

220 is pretty much an empty tank. If you're starting with 210 on a AL80, you got gypped.

Are you sure you're not reading the pressure gauge wrong?

It's just a glance to the left "oh, look, they list their location as cyprus"
And then a step to the right "That's one of them places that uses that metric system."
You bring the issue in tight "Must be they meant bars, 30 psi reg would barely work anyway."

the air readings were in bar.

Poster is from Cyprus. Probably not psi. Probably bar.

I think we can now safely say that the readings were in bar.

 

[lv2dive]

The reason that doesn’t work so well on ScubaBoard is its size... edits are allowed for a short period of time but bc it’s a very active community, long-term editing rights (or delete capabilities) would create more confusion than it solves.

A simpler solution, which many internet forums have adopted, is to permit users to edit or delete their posts at any time.

 

[Roger Hobden]

My guess? He was taught to clear his mask while kneeling on the bottom of a pool, and that is the only way he has ever done it. He had to find a solid surface on which to kneel.

First thing that came to my mind also.

 

[dberry]

Agreed, certainly a thing to check when renting gear. Most everywhere I've been offers both in rental gear (because US divers like PSI).

For general use, it doesn't much matter what units are in the dial, so long as you know what's too little. If you want to do the planning and calculate stuff based on air consumption (L/min) I don't see why anyone would willingly use PSI when Bar is so much simpler (Bar x tank volume = liters of air available).

I certainly agree that metric is better, but life isn't quite so simple. Tanks in the US are rated by volume of gas they hold at 1 atm, NOT the true internal volume. Yes, this is roughly as stupid as using imperial units instead of metric. So your 15L tank is roughly the same as a 120 cf tank. Your tank actually holds 15 L of gas whatever the pressure. At 230 bar that's about 120cf. And calculations based on air consumption are much easier.

Our 120 cf tank only holds "120 cf" when filled to the rated pressure (3500 psi or whatever). This pressure varies markedly depending on the type of tank. An Al80 needs to be filled to 3000psi to actually hold 80 cf (actually 77 cf, but let's ignore that.). One workaround is to calculate (or lookup) the "tank factor", which is a fudge to effectively deal with the true internal volume of a tank over here.

I'm not trying to justify the system over here, just pointing out that until the tanks are described with a true volume (in liters or cf), the switch to metric for pressures isn't particularly helpful.

 

[Bob DBF]

In theory, yes.

In pratice, I see nothing of the sort.

With members dropping out and signing up all the time it may look that way, but if you read divers that stay here over time you will notice more thoughtfulness in responses.


Bob

 

[Roger Hobden]

With members dropping out and signing up all the time it may look that way, but if you read divers that stay here over time you will notice more thoughtfulness in responses.
Bob

Actually, I learned tons of very useful things here on ScubaBoard, and I appreciate that aspect very, very much.

SB is a real goldmine of information for beginner divers like myself.

But, OTOH, I find disappointing that threads that start out very well like " Why ‘everyone is responsible for their own risk-based decisions’ isn’t the right approach to take. " unfortunately seem, more often then not, to degenerate into endless philosophical and political debates.

 

[divinh]

I have a mustache which has caused mask leakage from day one of diving; because of that, I got really good at mask clearing.

I had a prescription mask that was on the brink of failing, and when it did, I had no trouble swapping it out underwater. Sometimes "ill" fitting equipment gets you to practice certain skills more.

I've had two unintended ascents in my dive history. The first was on a fun dive, not very deep, and I got disoriented going over bubbles from other divers below me; I couldn't tell I was ascending. The second time, I started floating up and began to swim down, but I didn't use the rear dump valve and just could not get rid of the air with the inflator purge. From those mistakes, I learned to watch my depth better and use the rear dump valve.

 

[Zef]

I certainly agree that metric is better, but life isn't quite so simple. Tanks in the US are rated by volume of gas they hold at 1 atm, NOT the true internal volume. Yes, this is roughly as stupid as using imperial units instead of metric. So your 15L tank is roughly the same as a 120 cf tank. Your tank actually holds 15 L of gas whatever the pressure...

It is not true that "Your tank actually holds 15L of gas what ever the pressure"....A 15L tank is measured to hold 15L of water (or 15L of gas at 1bar)....at 200bar a 15L tank holds 3000L of gas (air).

-Z