Drager CCR vs. Other Rebreathers

**Dave1w** · 23rd March 2008, 11:44

I think I have seen a few peeps here using a dolphin first stage. Does anyone know how low the IP can be adjusted on one?
Dave

divetheworld · 23rd March 2008, 12:55

Quote: (Originally Posted by Dave1w)

I think I have seen a few peeps here using a dolphin first stage. Does anyone know how low the IP can be adjusted on one?
Dave

Be awfly careful.
The original Drager 1st stage had a safety feature built in. If the orifice's were blocked the pressure would build up until it lifted the ADV and bled gas into the loop.
This means there is IP creep if flow is sufficiently low.

sailor · 23rd March 2008, 15:03

Quote: (Originally Posted by divetheworld)

Are you using a special orifice?
The hydrogom I had from Jeroen runs a 0.009mm orifice.

0.8ltr/min flow on a 0.009 orifice means an IP of 13.9 (rounded).
At 19 bar (assuming no IP creep that is designed into the Draeger valves) means a flow of a nads over 1ltr/min.
To get a flow of 0.8 from an IP of 19 bar you need a 0.0077mm orifice.

Brent

Hi, i can´t tell what size my orifice actually is but it delivers 0,8 ltr./min at 19 bar.
I know for sure it´s smaller than the standard orifice coming with the hydrogom valve.
So propably you are right with the size you mentioned.

Regarding creeping IP see my other reply.

sailor · 23rd March 2008, 15:08

Quote: (Originally Posted by Dave1w)

I think I have seen a few peeps here using a dolphin first stage. Does anyone know how low the IP can be adjusted on one?
Dave

I don´t know about the 1st generation piston 1st stages.
I´m using the 2nd generation Draeger diaphragm 1st stages and they can reach up to 20 bar.
Make sure your IP hoses can handle that.

sailor · 23rd March 2008, 15:12

Quote: (Originally Posted by divetheworld)

Be awfly careful.
The original Drager 1st stage had a safety feature built in. If the orifice's were blocked the pressure would build up until it lifted the ADV and bled gas into the loop.
This means there is IP creep if flow is sufficiently low.

I´m using the 2nd generation Draeger diaphragm 1st stages.
This model completly shuts off the HP once the adjusted IP is reached unlike the 1st generation piston 1st stage which used to have IP creeping.
For mCCR of course my ADV is not connected to the O2 side.

23rd March 2008, 11:44	#11 (permalink)
Dave1w Born Again Diver! Current Rebreather/s: Sport Kiss Dolphin Ray Home Build Other Rebreather/s: Dolphin Ray Home Build Join Date: Jan 2005 Location: China / UK Posts: 312	Re: Drager CCR vs. Other Rebreathers I think I have seen a few peeps here using a dolphin first stage. Does anyone know how low the IP can be adjusted on one? Dave __________________ This message may contain spelling mistakes as it was generated by an idiot.
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23rd March 2008, 12:55	#12 (permalink)
divetheworld Dive porn pimp Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Classic Kiss Other CCR Join Date: Mar 2005 Location: Leeds, England Posts: 1,507	Re: Drager CCR vs. Other Rebreathers Quote: (Originally Posted by Dave1w) I think I have seen a few peeps here using a dolphin first stage. Does anyone know how low the IP can be adjusted on one? Dave Be awfly careful. The original Drager 1st stage had a safety feature built in. If the orifice's were blocked the pressure would build up until it lifted the ADV and bled gas into the loop. This means there is IP creep if flow is sufficiently low. __________________ Self praise is no reccomendation. Dont try to be a great man, just be a man and let history be the judge of you. CHECK OUT OUR INTERWEBS FOR CUSTOM REBREATHER UPGRADES *WWW.NARKEDAT90.CO.UK* *http://www.grpservices.com/pursuit/* Supporting Shearwater Research Products in Europe
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23rd March 2008, 15:03	#13 (permalink)
sailor New Member Current Rebreather/s: Inspiration Vision Other CCR Dolphin Other Rebreather/s: Other CCR Dolphin Join Date: Jul 2006 Location: UAE Posts: 43	Re: Drager CCR vs. Other Rebreathers Quote: (Originally Posted by divetheworld) Are you using a special orifice? The hydrogom I had from Jeroen runs a 0.009mm orifice. 0.8ltr/min flow on a 0.009 orifice means an IP of 13.9 (rounded). At 19 bar (assuming no IP creep that is designed into the Draeger valves) means a flow of a nads over 1ltr/min. To get a flow of 0.8 from an IP of 19 bar you need a 0.0077mm orifice. Brent Hi, i can´t tell what size my orifice actually is but it delivers 0,8 ltr./min at 19 bar. I know for sure it´s smaller than the standard orifice coming with the hydrogom valve. So propably you are right with the size you mentioned. Regarding creeping IP see my other reply.
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23rd March 2008, 15:08	#14 (permalink)
sailor New Member Current Rebreather/s: Inspiration Vision Other CCR Dolphin Other Rebreather/s: Other CCR Dolphin Join Date: Jul 2006 Location: UAE Posts: 43	Re: Drager CCR vs. Other Rebreathers Quote: (Originally Posted by Dave1w) I think I have seen a few peeps here using a dolphin first stage. Does anyone know how low the IP can be adjusted on one? Dave I don´t know about the 1st generation piston 1st stages. I´m using the 2nd generation Draeger diaphragm 1st stages and they can reach up to 20 bar. Make sure your IP hoses can handle that.
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23rd March 2008, 15:12	#15 (permalink)
sailor New Member Current Rebreather/s: Inspiration Vision Other CCR Dolphin Other Rebreather/s: Other CCR Dolphin Join Date: Jul 2006 Location: UAE Posts: 43	Re: Drager CCR vs. Other Rebreathers Quote: (Originally Posted by divetheworld) Be awfly careful. The original Drager 1st stage had a safety feature built in. If the orifice's were blocked the pressure would build up until it lifted the ADV and bled gas into the loop. This means there is IP creep if flow is sufficiently low. I´m using the 2nd generation Draeger diaphragm 1st stages. This model completly shuts off the HP once the adjusted IP is reached unlike the 1st generation piston 1st stage which used to have IP creeping. For mCCR of course my ADV is not connected to the O2 side.
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