DIR and Poseidon

Hello,

I read something about the fac that Poseidon regulators are not DIR, but I
cannot find the reasons.
Does someone have more info?

Greets,

Daan

"diver" <@> wrote in message
news:3f38a52a$0$49114$e4fe514c@news.xs4all.nl...
> Hello,
>
> I read something about the fac that Poseidon regulators are not DIR, but I
> cannot find the reasons.
> Does someone have more info?
>
> Greets,
>
> Daan

Here are the reasons as I understand them:

Upstream 2nd stage design... failure mode is "off" instead of "freeflow"
Unable to take 2nd stage apart underwater
Pressure relief valve is an unnecessary failure point
Custom hose fitting can be a PITA

Jon

jon@jonnythan.com stopped playing nethack just long enough to say:
>"diver" <@> wrote in message
>news:3f38a52a$0$49114$e4fe514c@news.xs4all.nl.. .
>>
>> I read something about the fac that Poseidon regulators are not DIR, but I
>> cannot find the reasons.
>
>Upstream 2nd stage design... failure mode is "off" instead of "freeflow"
>Unable to take 2nd stage apart underwater
>Pressure relief valve is an unnecessary failure point
>Custom hose fitting can be a PITA

Also:

IP is set too high
Non-standard second stage design is less hydrodynamic, increases jaw
fatigue, and complicates air sharing during OOA

-JimG

--
Jim Greenlee (jkg@cc.gatech.edu) MUSIC EXCUSE # 42: Make a mistake
College of Computing once, and it's just a mistake. But
Georgia Tech, Atlanta, GA 30332 if you do it twice then it's jazz.

Jim.Greenlee@cc.gatech.edu wrote:

>>Upstream 2nd stage design... failure mode is "off" instead of "freeflow"

Not so with the Cyclon.

>>Unable to take 2nd stage apart underwater
LMAO... try this in heavy current and bad viz...

>>Pressure relief valve is an unnecessary failure point
There is no PRV on the cyclon.

>>Custom hose fitting can be a PITA
Like on the Apeks DST & up (1/2" big bore hose).

>Also:
>
>IP is set too high
Not with the Cyclon, only the Jetstream uses high IP.

>Non-standard second stage design is less hydrodynamic, increases jaw
> fatigue, and complicates air sharing during OOA
Ever used one? It's about the best reg possible to share air.

Steven
+------------------------------------------------+
| Please use steevke at hotmail dot com to reply |
+------------------------------------------------+
| Nunc Plaudite Manibus |
+------------------------------------------------+

In article <crpjjvcehiq00rkgti0sc7vvkuqacnnaa3@4ax.com>, Steven
Tolleneer <steevke@nospam.com> wrote:

€ Ever used one? It's about the best reg possible to share air.

Stroke alert.

--
"We're going to rush the hijackers."
-Jeremy Glick, aboard United Airlines flight 93, September 11, 2001

steevke@nospam.com stopped playing nethack just long enough to say:
>
>>>Unable to take 2nd stage apart underwater
>LMAO... try this in heavy current and bad viz...

....When the reg is fouled and free-flowing.

>>>Custom hose fitting can be a PITA
>Like on the Apeks DST & up (1/2" big bore hose).

Also a PITA, but not nearly as much because you can get adapters fairly
easily. I personally don't use them, though - prefer to have everything
standardized as much as possible.

>>Non-standard second stage design is less hydrodynamic, increases jaw
>> fatigue, and complicates air sharing during OOA
>Ever used one? It's about the best reg possible to share air.

Try explaining that to your OOA buddy when he cannot find the purge
button right away.

-JimG

--
Jim Greenlee (jkg@cc.gatech.edu) And the coders spake unto the analysts,
College of Computing saying: "It is a crucible of excrement
Georgia Tech, Atlanta, GA 30332 and none may abide by the odor thereof"

Jon C <jon@jonnythan.com> skriver:
> Dear lord, I couldn't think of anything worse. Maybe it works OK if both
> you and your buddy are used to the side exhaust (which, IMO, are a serious
> pain in the ass). I guess if you have everyone using Cyclons... But who
> uses Cyclons these days? What's the advantage?

They are common in Sweden, and the one thing that seams to be better
than Jetstream in the price. Personaly I think that are OK under water
but I prefer my Apex regs.

/ Anders
--
http://anders.arnholm.nu/ Keep on Balping

"Anders Arnholm" <Anders+news@Arnholm.nu> wrote in message
news:slrnbjkj0g.s50.Anders+news@tika.arnholm.nu...
> Jon C <jon@jonnythan.com> skriver:
> > Dear lord, I couldn't think of anything worse. Maybe it works OK if
both
> > you and your buddy are used to the side exhaust (which, IMO, are a
serious
> > pain in the ass). I guess if you have everyone using Cyclons... But
who
> > uses Cyclons these days? What's the advantage?
>
> They are common in Sweden, and the one thing that seams to be better
> than Jetstream in the price. Personaly I think that are OK under water
> but I prefer my Apex regs.

You might want to go find your regs and look at them really closely. They
don't say Apex.

At least....... I hope they don't :)

Jon

jon@jonnythan.com stopped playing nethack just long enough to say:
>
>You might want to go find your regs and look at them really closely. They
>don't say Apex. At least....... I hope they don't :)

Of course, if the say "Acme" and your name is Wile E. Coyote, then that
could be a problem.

-JimG

--
Jim Greenlee (jkg@cc.gatech.edu) Let the bridge computer speak
College of Computing LOAD YOUR PROGRAM! I AM YOURSELF!
Georgia Tech, Atlanta, GA 30332 No computer stands in my way

On Tue, 12 Aug 2003 10:28:24 +0200, "diver" <@> wrote:

>Hello,
>
>I read something about the fac that Poseidon regulators are not DIR, but I
>cannot find the reasons.
>Does someone have more info?

Every one of these may not apply to all models:

1 - Tools required to disassemble 2nd stage
If you get crap inside, it's pretty close to impossible to open it up
to clear.

2 - Non-standard hose
Good luck finding a replacement hose in Cozumel

3 - Upstream valve
1st stage IP creep may lock the 2nd stage shut... that's why the 1st
has an OPV like an argon bottle. The OPV is an added failure point on
the primary breathing gas supply.




--- Rich
http://richlockyer.tripod.com/