Going deeper than the IP, will it flood?

jaap · 26th September 2006, 08:08

Quote: (Originally Posted by paulraymaekers)

to prevent gas with moister going backwards trough the orifice, and blocking it, on the rEvo's there is always a one-way valve mounted after the orifice.

regards
paul

Nice, its the first time I have heard about a mccr unit that has a one way valve in the oxygen addition.

jaap · 26th September 2006, 08:41

Quote: (Originally Posted by jakelost)

Hello JAAP !!

Dont you think that the only problem with this is only the design of the
second stage , i would make a second stage with a piston design rather
than using a membran.

// Jakob

Piston second stage? I'm only familar with membrane second stages.
A link or description of how that would work?

I guess that like JDZ says an upstream 2'nd stage would automaticly flood and that a downstream one could stay dry if the purge is not touched.

jakelost · 26th September 2006, 09:04

I was thinking of how to make a dosage system like the SM1 Rebreather
and not so much of using a standars secdond stage , sorry if i was not so clear about what i meant .

// Jakob

Marc T · 26th September 2006, 09:09

Quote: (Originally Posted by jaap)

I was wondering if anyone has first hand experiemce of this scenario:

Take a reglator with a fixt IP on the first stage, say 3 bar. A normal second stage is fitted to it.

Would it flood if it was taken to say 60m depth? The regulator is not used at depth but it is pressurized.
).

I suddenly realize that I and some others have incorrectly read this part of the question.
In fact you have the same situation when you turn off the valve of your bailout tank after testing it on surface and before going down ( Fixed IP reg or not are here in the same situation)

Im I wrong?

jaap · 26th September 2006, 09:22

Quote: (Originally Posted by Marc T)

I suddenly realize that I and some others have incorrectly read this part of the question.
In fact you have the same situation when you turn off the valve of your bailout tank after testing it on surface and before going down ( Fixed IP reg or not are here in the same situation)

Im I wrong?

I would say its not exactly the same case depending on the valve routine. Turning the valve off you still have some HP gas left in the 1'stage that will try and keep the IP above ambient. Asuming a _non_ fixt IP regulator or one with a fixt IP higher than max ambient.

I have never flooded a sling tank regulator, but then I usually have my bailout open or for decotanks if I have it closed I try to just twist it on now and then to make sure the reg is pressurized.

If the valve is closed and the reg is accidently purged I would say there is a high probability that the reg is flooded if the closed reg gets purged and the diver goes deeper. Have a few friends that have flooded regs that way.

26th September 2006, 08:08	#11 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 445	Re: Going deeper than the IP, will it flood? Quote: (Originally Posted by paulraymaekers) to prevent gas with moister going backwards trough the orifice, and blocking it, on the rEvo's there is always a one-way valve mounted after the orifice. regards paul Nice, its the first time I have heard about a mccr unit that has a one way valve in the oxygen addition.
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26th September 2006, 08:41	#12 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 445	Re: Going deeper than the IP, will it flood? Quote: (Originally Posted by jakelost) Hello JAAP !! Dont you think that the only problem with this is only the design of the second stage , i would make a second stage with a piston design rather than using a membran. // Jakob Piston second stage? I'm only familar with membrane second stages. A link or description of how that would work? I guess that like JDZ says an upstream 2'nd stage would automaticly flood and that a downstream one could stay dry if the purge is not touched.
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26th September 2006, 09:04	#13 (permalink)
jakelost New Member Current Rebreather/s: Sport Kiss Other SCR Other Rebreather/s: Other SCR Join Date: Feb 2006 Location: Sweden Posts: 22	Re: Going deeper than the IP, will it flood? I was thinking of how to make a dosage system like the SM1 Rebreather and not so much of using a standars secdond stage , sorry if i was not so clear about what i meant . // Jakob
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26th September 2006, 09:09	#14 (permalink)
Marc T hell is in the details Current Rebreather/s: RB80 / Clone Home Build Other Rebreather/s: Not Bought Yet RB80 / Clone Home Build Join Date: Sep 2005 Location: FRANCE Carcassonne Posts: 470	Re: Going deeper than the IP, will it flood? Quote: (Originally Posted by jaap) I was wondering if anyone has first hand experiemce of this scenario: Take a reglator with a fixt IP on the first stage, say 3 bar. A normal second stage is fitted to it. Would it flood if it was taken to say 60m depth? The regulator is not used at depth but it is pressurized. ). I suddenly realize that I and some others have incorrectly read this part of the question. In fact you have the same situation when you turn off the valve of your bailout tank after testing it on surface and before going down ( Fixed IP reg or not are here in the same situation) Im I wrong?
(Online)

26th September 2006, 09:22	#15 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 445	Re: Going deeper than the IP, will it flood? Quote: (Originally Posted by Marc T) I suddenly realize that I and some others have incorrectly read this part of the question. In fact you have the same situation when you turn off the valve of your bailout tank after testing it on surface and before going down ( Fixed IP reg or not are here in the same situation) Im I wrong? I would say its not exactly the same case depending on the valve routine. Turning the valve off you still have some HP gas left in the 1'stage that will try and keep the IP above ambient. Asuming a _non_ fixt IP regulator or one with a fixt IP higher than max ambient. I have never flooded a sling tank regulator, but then I usually have my bailout open or for decotanks if I have it closed I try to just twist it on now and then to make sure the reg is pressurized. If the valve is closed and the reg is accidently purged I would say there is a high probability that the reg is flooded if the closed reg gets purged and the diver goes deeper. Have a few friends that have flooded regs that way. Last edited by jaap : 26th September 2006 at 09:23. Reason: Spelling
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