increase in ppo2

John Langley · 15th May 2006, 19:09

Now this is the second time that this has happened to me on a dive.

After getting down the shot and checking out my po2, the digits were increasing alarmingly.

did dill flush, but the po2 just kept increasing, so turned off the o2 from the cylinder, dill flushed again po2 came down. So turned the cylinder back on,and all was working ok for the rest of the dive.

After the fist time this happened I stripped the o2 add valve down and put in ultra sonic cleaner, changed the O rings re greased, and all seemed ok, till yesterday.

Any suggestions greatfuly received

dave t · 15th May 2006, 19:39

is the first stage "blanking plug" leaking?

did you grease inside the add valve too much/not enough? (o-ring sticking)

do you jump with too high po2 in the loop?

HTH

Dave

Sutty · 15th May 2006, 19:50

Does the O2 flow correspond to the IP? If not the orifice could be partially clogged, and the IP set high to compensate, then if a clogging particle moves you'd get higher flow. It would account for the erratic behaviour.
Blanking plate leaking should continue to give higher flow, at least until you ascend.

Neil

dave t · 15th May 2006, 19:55

Quote: (Originally Posted by Sutty)

Does the O2 flow correspond to the IP? If not the orifice could be partially clogged, and the IP set high to compensate, then if a clogging particle moves you'd get higher flow. It would account for the erratic behaviour.
Blanking plate leaking should continue to give higher flow, at least until you ascend.

Neil

only if the leak is static

Sue · 15th May 2006, 20:07

John

did you check the Intermediate pressue of your o2 first stage regulator?

That hapened to me when I started diving the Kiss, and I had to adjust IP. Afterwards it was ok.

Sue

John Langley · 15th May 2006, 20:35

Ive checked the interstage pressure and it hasnt changed from when I first set it.
When I jump in I set po2 at .6, and keep an eye on it all the way down the shot, and adjust accordingly when at the bottom.That is when I first notice the didgits racing upwards, on the bottom.

After I stripped and cleaned the add valve I lightly lubricated the O rings before reassembling, just a light coating.

I dont think its the blanking plug leaking because wouldnt it continually be increasing, and not,as it does,go back to normal after I turn cyl valve off then back on?

Perhaps I will strip add valve down again and take a closer look at the componant parts.

J.L.

dave t · 15th May 2006, 20:45

John

I had this problem too

blanking plug leaked half way down

po2 went through the roof
closed tank and flushed, this lowered the IP and "reseated the plug o-ring by this time I was static on the bottom

turned tank back on and all was ok

my solution was to fit a slightly thicker o-ring

HTH

Dave

edit I should have said I wasnt very deep, if I had have been the IP would have still been too high after turning the tank back on

Andy M · 15th May 2006, 20:52

Quote: (Originally Posted by dave t)

I had this problem too

blanking plug leaked half way down

po2 went through the roof
closed tank and flushed, this lowered the IP and "reseated the plug o-ring by this time I was static on the bottom

Wouldnt you find water behind the plug if this was the cause? John, have you checked for water underneath the plug?

John Langley · 15th May 2006, 20:54

Excellant
Thanks for that Dave will change Oring and try again.

John

John Langley · 15th May 2006, 21:01

Just had plug out, and it was dry behind.

John

15th May 2006, 19:09	#1 (permalink)
John Langley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Classic Kiss Join Date: Apr 2005 Location: in an appartment on the 99th floor of my block Posts: 103	increase in ppo2 Now this is the second time that this has happened to me on a dive. After getting down the shot and checking out my po2, the digits were increasing alarmingly. did dill flush, but the po2 just kept increasing, so turned off the o2 from the cylinder, dill flushed again po2 came down. So turned the cylinder back on,and all was working ok for the rest of the dive. After the fist time this happened I stripped the o2 add valve down and put in ultra sonic cleaner, changed the O rings re greased, and all seemed ok, till yesterday. Any suggestions greatfuly received
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15th May 2006, 19:39	#2 (permalink)
dave t RBW Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 674	Re: increase in ppo2 is the first stage "blanking plug" leaking? did you grease inside the add valve too much/not enough? (o-ring sticking) do you jump with too high po2 in the loop? HTH Dave
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15th May 2006, 19:50	#3 (permalink)
Sutty Classic Kiss diver Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Jun 2005 Location: Glossop, Derbyshire, UK Posts: 837	Re: increase in ppo2 Does the O2 flow correspond to the IP? If not the orifice could be partially clogged, and the IP set high to compensate, then if a clogging particle moves you'd get higher flow. It would account for the erratic behaviour. Blanking plate leaking should continue to give higher flow, at least until you ascend. Neil __________________ Never forget that life is a finite resource.
(Online)

15th May 2006, 19:55	#4 (permalink)
dave t RBW Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 674	Re: increase in ppo2 Quote: (Originally Posted by Sutty) Does the O2 flow correspond to the IP? If not the orifice could be partially clogged, and the IP set high to compensate, then if a clogging particle moves you'd get higher flow. It would account for the erratic behaviour. Blanking plate leaking should continue to give higher flow, at least until you ascend. Neil only if the leak is static
(Online)

15th May 2006, 20:07	#5 (permalink)
Sue RBW Writer Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Portugal Posts: 161	Re: increase in ppo2 John did you check the Intermediate pressue of your o2 first stage regulator? That hapened to me when I started diving the Kiss, and I had to adjust IP. Afterwards it was ok. Sue
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15th May 2006, 20:35	#6 (permalink)
John Langley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Classic Kiss Join Date: Apr 2005 Location: in an appartment on the 99th floor of my block Posts: 103	Re: increase in ppo2 Ive checked the interstage pressure and it hasnt changed from when I first set it. When I jump in I set po2 at .6, and keep an eye on it all the way down the shot, and adjust accordingly when at the bottom.That is when I first notice the didgits racing upwards, on the bottom. After I stripped and cleaned the add valve I lightly lubricated the O rings before reassembling, just a light coating. I dont think its the blanking plug leaking because wouldnt it continually be increasing, and not,as it does,go back to normal after I turn cyl valve off then back on? Perhaps I will strip add valve down again and take a closer look at the componant parts. J.L.
(Offline)

15th May 2006, 20:45	#7 (permalink)
dave t RBW Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 674	Re: increase in ppo2 John I had this problem too blanking plug leaked half way down po2 went through the roof closed tank and flushed, this lowered the IP and "reseated the plug o-ring by this time I was static on the bottom turned tank back on and all was ok my solution was to fit a slightly thicker o-ring HTH Dave edit I should have said I wasnt very deep, if I had have been the IP would have still been too high after turning the tank back on Last edited by dave t : 15th May 2006 at 20:49.
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15th May 2006, 20:52	#8 (permalink)
Andy M Dude Current Rebreather/s: Home Build Other Rebreather/s: Sport Kiss Home Build Join Date: Mar 2005 Location: Cambridge, UK Posts: 428	Re: increase in ppo2 Quote: (Originally Posted by dave t) I had this problem too blanking plug leaked half way down po2 went through the roof closed tank and flushed, this lowered the IP and "reseated the plug o-ring by this time I was static on the bottom Wouldnt you find water behind the plug if this was the cause? John, have you checked for water underneath the plug? __________________ Know your PO2 at all times
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15th May 2006, 20:54	#9 (permalink)
John Langley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Classic Kiss Join Date: Apr 2005 Location: in an appartment on the 99th floor of my block Posts: 103	Re: increase in ppo2 Excellant Thanks for that Dave will change Oring and try again. John
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15th May 2006, 21:01	#10 (permalink)
John Langley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Classic Kiss Join Date: Apr 2005 Location: in an appartment on the 99th floor of my block Posts: 103	Re: increase in ppo2 Just had plug out, and it was dry behind. John
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