Poseidon Regulator Reliability…

[Tracy]

So... how do you do that for the rest on O2 bottles then?

Poseidons should never be used on a bottle that gets turned off underwater.
If the reg gets purged down while the bottle is off, you wind up with a regulator completely flooded with seawater.
People do it all the time, but they also spend a lot of money servicing something that wouldn't need serviced if they used a different reg.
The are great regs, but they should be used for backgas, not deco gas.

 

[Tanks A Lot]

[...]
We are not at odds, and the statement buried late in my comment stands:
[...]

Absolutely, I knew we were on the same page. I just wanted to take the chance to expand a little bit on the Poseidons, as they often get a bad reputation, despite being most cleverly engineered. It's a little bit like the Sherwood dry-chamber design (I didn't particularly like the old one with the sintered filter). People see bubbles or hear gas and automatically assume they lose a ton of dive-time, when it really is mostly a nothing-burger, leaving broken things aside for a minute.

[...]
If you were taught to take 3 minutes to open a 100% O2 tank, as one conservative CCR Instructor opined, you will be unhappy with a Jetstream or Xstream.
[...]

I guess there is some sarcasm lost on me here, but I reckon you are joking/exaggerating with the 3 minute remark? My mind just pictured a busy nurse or rough looking welder being told to take 3 literal minutes to open a cylinder valve by a supervisor. They were most unhappy!

 

[iliketopetsharks]

Poseidons should never be used on a bottle that gets turned off underwater.
If the reg gets purged down while the bottle is off, you wind up with a regulator completely flooded with seawater.
People do it all the time, but they also spend a lot of money servicing something that wouldn't need serviced if they used a different reg.
The are great regs, but they should be used for backgas, not deco gas.

Wait, what if you do a valve drill?

 

[Tracy]

Wait, what if you do a valve drill?

You purge until the bubbles slow rather than until they stop. You only purge to verify the valve is closed. If you are in an actual valve shutdown scenario, servicing a first stage shouldn't be a high priority.

 

[pisauron]

Poseidons should never be used on a bottle that gets turned off underwater.
If the reg gets purged down while the bottle is off, you wind up with a regulator completely flooded with seawater.
People do it all the time, but they also spend a lot of money servicing something that wouldn't need serviced if they used a different reg.
The are great regs, but they should be used for backgas, not deco gas.

Which Poseidons? All of them?

 

[Tracy]

Which Poseidons? All of them?

It is just the second stages. Xstream first stages are what other first stages should aspire to be.
If you really really want to use a Poseidon second for deco, the Triton was a traditional second stage. You could use that.

 

[pisauron]

It is just the second stages. Xstream first stages are what other first stages should aspire to be.
If you really really want to use a Poseidon second for deco, the Triton was a traditional second stage. You could use that.

What about a cyklon? If you turn it off underwater will it flood?

 

[Tracy]

What about a cyklon? If you turn it off underwater will it flood?

It shouldn't, the cyklon is a downstream reg, just not a standard design like other regulators.
The flooding issue has to do with upstream regs, they are closed by pressure, when you lose pressure, you have an open path for water.
I forgot about the Cyklon, I almost never see them. Jetstreams unfortunately just keep showing up.

 

[Bigbella]

It shouldn't, the cyklon is a downstream reg, just not a standard design like other regulators.
The flooding issue has to do with upstream regs, they are closed by pressure, when you lose pressure, you have an open path for water.
I forgot about the Cyklon, I almost never see them. Jetstreams unfortunately just keep showing up.

I’ve used the Cyklon seconds for years (from the 300 to the X) on deco bottles and ponies, with or without inline Omniswivel shutoff valves, which are dirt-simple and dependable . . .