Valves....how much open ?

**nigelh** · 19th April 2005, 10:20

Quote: (Originally Posted by Pierre Farrugia)

While diving your YBOD how much do you open your valves ?

Three twists so about a turn and a half. I hear the gas come on on the first twist and the rest is just to assure myself it is well open but not so far that in SHF mode I can't shut it fast.

Admittedly my only real valve shut requirement was the AutoAir taking offence at being asked to fill a DSMB, getting in a sulk and dribbling bubbles.

decoweenie · 19th April 2005, 12:47

Quote: (Originally Posted by JonnyB)

It would be nice to hear from anyone who uses KISS... how much do you open?

The 1-1/2 to 2 turns is pretty much "universal" for CCR (for the reasons explained by Rob) so not sure why you think diving a KISS would be different.

The only I want to add is to make sure that the diluent side is kept adequately open so the flow is not restricted if you have hooked a OC/CC DSV to it. Also same for installing any T or QC adapters, make sure to use the high-flow version so no restriction is present.

buggeriamold · 19th April 2005, 12:50

I have got to say I find it quite interesting that everyone that has replied opens there valves only a small amount!

From my new to rebreathers (a kiss) perspective the thing that scares me most is low ppo2. So to my mind if my valve is full open I am going to have less chance of bumping the valve closed and probably more relevant to the dil, better flow at depth. The downside is it takes longer to shut down, but once again as a newbie my modis operandi in case of doubt is flip that oc dsv switch.

Mind you, I guess that my mindset comes from years of diving oc and not having a reg free flow or hose burst under water.

Looks like there is a ccr mind set that I haven’t quite got yet!

Interesting

Mark

decoweenie · 19th April 2005, 12:58

Quote: (Originally Posted by buggeriamold)

Mind you, I guess that my mindset comes from years of diving oc and not having a reg free flow or hose burst under water.

Did you do a O2-valve-failed-open exercise in class with the instructor holding your O2 injector full open ?

Did you notice how fast your PO2 climbed ?

Did you notice how fast your buoyancy changed ?

Did you notice how long it took to close the O2 tank down if you had it full open ?

Did you notice how much O2 you lose during that time ? Now multiply that by the ATA of the depth you will be diving...

Now, if the first reaction you do if you have a real-life O2-valve-failed-open, say a trimix dive, is switching to OC, then you might be losing too much O2 to complete the rest of the dive.

Mark Chase · 19th April 2005, 13:05

Quote: (Originally Posted by Decodiver)

Pierre,

I have both the Dil and O2 open one-and-a-half turns.

No problem even at 125 metres.

Cheers,

Dave Cooper.

This is what I have started to do (two turnes but so what

) I do wory about run away inflates from the dill so I think its sensible and I use so little dill during a dive I dont see it as a problem.

ATB

Mark Chase

buggeriamold · 19th April 2005, 13:12

Quote:

Did you notice how much O2 you lose during that time ? Now multiply that by the ATA of the depth you will be diving...

Now, if the first reaction you do if you have a real-life O2-valve-failed-open, say a trimix dive, is switching to OC, then you might be losing too much O2 to complete the rest of the dive.

Yes to the first 5. So for me (probably because i don’t trust my self to do anything fast enough) is to oc bailout then think.
The sixth for me is covered by carrying enough bailout.

But, it is fairly obvious this isn’t with the majority.

Mark

decoweenie · 19th April 2005, 14:53

Quote: (Originally Posted by buggeriamold)

But, it is fairly obvious this isn’t with the majority.

But that's not what matters.

What matters is what you know you could do reliably each and every single time.

And in this case, it is to switch to OC, think and act. You also carry adequate OC-bail-out to get out of the water safely.

So do whichever technique you are comfortable with, and know that you could do reliably in an emergency. Who cares what anyone else does if it is something you don't think is the right thing for you (yet)!

Dive safe!

decoweenie · 19th April 2005, 14:57

Quote: (Originally Posted by Mark Chase)

I do wory about run away inflates from the dill

Take a look at the rubber tool that Tobin makes to allow disconnecting the inflator LP hose very quickly. It is very nice and simple!

**RichClark** · 19th April 2005, 15:10

I just had a look, and they look really nice, has anyone actually used them in anger?

I currently use Apeks nipples on all my kit (inflator and drysuit) so that I have nice chunky disconnects, but this may be a better solution.

Cheers

Rich

ROB DAVIE · 19th April 2005, 15:16

Quote: (Originally Posted by nigelh)

Admittedly my only real valve shut requirement was the AutoAir taking offence at being asked to fill a DSMB, getting in a sulk and dribbling bubbles.

Nige,

You still have that thing (AA) on your unit? Wow!

Rob

19th April 2005, 10:20	#11 (permalink)
nigelh New member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 873	Quote: (Originally Posted by Pierre Farrugia) While diving your YBOD how much do you open your valves ? Three twists so about a turn and a half. I hear the gas come on on the first twist and the rest is just to assure myself it is well open but not so far that in SHF mode I can't shut it fast. Admittedly my only real valve shut requirement was the AutoAir taking offence at being asked to fill a DSMB, getting in a sulk and dribbling bubbles. __________________ nigelh
(Online)

19th April 2005, 12:47	#12 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Quote: (Originally Posted by JonnyB) It would be nice to hear from anyone who uses KISS... how much do you open? The 1-1/2 to 2 turns is pretty much "universal" for CCR (for the reasons explained by Rob) so not sure why you think diving a KISS would be different. The only I want to add is to make sure that the diluent side is kept adequately open so the flow is not restricted if you have hooked a OC/CC DSV to it. Also same for installing any T or QC adapters, make sure to use the high-flow version so no restriction is present.
(Offline)

19th April 2005, 12:50	#13 (permalink)
buggeriamold Custom Title Allowed! Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Feb 2005 Location: australia Posts: 100	I have got to say I find it quite interesting that everyone that has replied opens there valves only a small amount! From my new to rebreathers (a kiss) perspective the thing that scares me most is low ppo2. So to my mind if my valve is full open I am going to have less chance of bumping the valve closed and probably more relevant to the dil, better flow at depth. The downside is it takes longer to shut down, but once again as a newbie my modis operandi in case of doubt is flip that oc dsv switch. Mind you, I guess that my mindset comes from years of diving oc and not having a reg free flow or hose burst under water. Looks like there is a ccr mind set that I haven’t quite got yet! Interesting Mark
(Offline)

19th April 2005, 12:58	#14 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Quote: (Originally Posted by buggeriamold) Mind you, I guess that my mindset comes from years of diving oc and not having a reg free flow or hose burst under water. Did you do a O2-valve-failed-open exercise in class with the instructor holding your O2 injector full open ? Did you notice how fast your PO2 climbed ? Did you notice how fast your buoyancy changed ? Did you notice how long it took to close the O2 tank down if you had it full open ? Did you notice how much O2 you lose during that time ? Now multiply that by the ATA of the depth you will be diving... Now, if the first reaction you do if you have a real-life O2-valve-failed-open, say a trimix dive, is switching to OC, then you might be losing too much O2 to complete the rest of the dive.
(Offline)

19th April 2005, 13:05	#15 (permalink)
Mark Chase RBW Member Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,821	Quote: (Originally Posted by Decodiver) Pierre, I have both the Dil and O2 open one-and-a-half turns. No problem even at 125 metres. Cheers, Dave Cooper. This is what I have started to do (two turnes but so what ) I do wory about run away inflates from the dill so I think its sensible and I use so little dill during a dive I dont see it as a problem. ATB Mark Chase __________________ See my "Doing It Chasey" video where I'm locked into a padded room, naked, with two ball bearings and within an Hour, I manage to lose one and break the other!!! Kevin Juergensen 16/11/08 [/quote]
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19th April 2005, 13:12	#16 (permalink)
buggeriamold Custom Title Allowed! Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Feb 2005 Location: australia Posts: 100	Quote: Did you notice how much O2 you lose during that time ? Now multiply that by the ATA of the depth you will be diving... Now, if the first reaction you do if you have a real-life O2-valve-failed-open, say a trimix dive, is switching to OC, then you might be losing too much O2 to complete the rest of the dive. Yes to the first 5. So for me (probably because i don’t trust my self to do anything fast enough) is to oc bailout then think. The sixth for me is covered by carrying enough bailout. But, it is fairly obvious this isn’t with the majority. Mark
(Offline)

19th April 2005, 14:53	#17 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Quote: (Originally Posted by buggeriamold) But, it is fairly obvious this isn’t with the majority. But that's not what matters. What matters is what you know you could do reliably each and every single time. And in this case, it is to switch to OC, think and act. You also carry adequate OC-bail-out to get out of the water safely. So do whichever technique you are comfortable with, and know that you could do reliably in an emergency. Who cares what anyone else does if it is something you don't think is the right thing for you (yet)! Dive safe!
(Offline)

19th April 2005, 14:57	#18 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Quote: (Originally Posted by Mark Chase) I do wory about run away inflates from the dill Take a look at the rubber tool that Tobin makes to allow disconnecting the inflator LP hose very quickly. It is very nice and simple!
(Offline)

19th April 2005, 15:10	#19 (permalink)
RichClark Classic KISS No. 226 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Hove, UK Posts: 791	I just had a look, and they look really nice, has anyone actually used them in anger? I currently use Apeks nipples on all my kit (inflator and drysuit) so that I have nice chunky disconnects, but this may be a better solution. Cheers Rich __________________ The more I learn about women, the more I want to go diving... just don't tell my wife I said that To taste something a little different, try http://www.thechillikitchen.co.uk
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19th April 2005, 15:16	#20 (permalink)
ROB DAVIE Administrator Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: HOUSTON, REPUBLIC OF TEJAS Posts: 1,120	Quote: (Originally Posted by nigelh) Admittedly my only real valve shut requirement was the AutoAir taking offence at being asked to fill a DSMB, getting in a sulk and dribbling bubbles. Nige, You still have that thing (AA) on your unit? Wow! Rob __________________ "CC Rebreathers will become a viable part of tech diving WHEN PIGS FLY!!"--GI3
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