Dolphin CCR

Divein · 23rd February 2007, 12:46

I am looking for some advice regarding diluent supply on my converted dolphin. It is the standard conversion with KISS valve feeding O2 through exhale port of scrubber and standard drager ADV.

During testing last week-end there were no problems in the 0-8 meter range and the unit performed well. However when I dropped to 18 metres I was struggling to exchange a good lung of gas with the counterlung. At the moment I am trying to eliminate potential causes.

One area I would welcome adivice on is the ADV. I am using an Apexs DST for diluent supply but I did not change the spring in the ADV leaving the old Drager one in. I was going to swop it for a spring out of an Apeks TX40 but the Apeks spring was much longer than the Drager one and I did not know what would happen to the Apeks spring if I cut it down to the same size. Any ideas/advice?

I am also trying to source some stainless 'o' clamps/clips also known as ear clamps to secure hose fittings. Does anyone know of an online seller in the UK please?

Thanks in advance for any replies.

nicka · 24th February 2007, 19:20

Try a usd conshelf spring,works great.

narked at 90 · 24th February 2007, 21:59

i also had a number of problems when i converted mine, the conshelf spring works if you can find one. i just happend to find a spring at a dive site, i dont know what it came from but did the job lovely

and then with a bit of retuning all was well, im guessing you have still got the adv in the counter lung rather than moving it to the opv position?
kind regards john routley
www.narkedat90.co.uk

grandizer52 · 25th February 2007, 00:35

try increasing the intermediate pressure

Divein · 25th February 2007, 12:20

Thanks for the advice. The Conshelf spring is likely to be extremely rare in UK.
John, I do have the ADV in the inhale counterlung still but i will tweak the IP to see if that makes a difference.

cheers.

spn2298 · 25th February 2007, 14:10

In my case, I replaced a spring to the Scuba Pro G250.
It makes possible for the demandvalve to work with normality I.P.

Regards,

Masa

23rd February 2007, 12:46	#1 (permalink)
Divein RBW Member Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Jun 2006 Location: Yorkshire Posts: 107	Dolphin CCR I am looking for some advice regarding diluent supply on my converted dolphin. It is the standard conversion with KISS valve feeding O2 through exhale port of scrubber and standard drager ADV. During testing last week-end there were no problems in the 0-8 meter range and the unit performed well. However when I dropped to 18 metres I was struggling to exchange a good lung of gas with the counterlung. At the moment I am trying to eliminate potential causes. One area I would welcome adivice on is the ADV. I am using an Apexs DST for diluent supply but I did not change the spring in the ADV leaving the old Drager one in. I was going to swop it for a spring out of an Apeks TX40 but the Apeks spring was much longer than the Drager one and I did not know what would happen to the Apeks spring if I cut it down to the same size. Any ideas/advice? I am also trying to source some stainless 'o' clamps/clips also known as ear clamps to secure hose fittings. Does anyone know of an online seller in the UK please? Thanks in advance for any replies.
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24th February 2007, 19:20	#2 (permalink)
nicka New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Apr 2006 Location: new zealand Posts: 24	Re: Dolphin CCR Try a usd conshelf spring,works great.
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24th February 2007, 21:59	#3 (permalink)
narked at 90 John Routley Current Rebreather/s: Inspiration Classic Other CCR Dolphin Home Build Other Rebreather/s: Other CCR Dolphin Home Build Join Date: Feb 2005 Location: middlands uk Posts: 1,074	Re: Dolphin CCR i also had a number of problems when i converted mine, the conshelf spring works if you can find one. i just happend to find a spring at a dive site, i dont know what it came from but did the job lovely and then with a bit of retuning all was well, im guessing you have still got the adv in the counter lung rather than moving it to the opv position? kind regards john routley www.narkedat90.co.uk __________________ *WWW.NARKEDAT90.CO.UK* *http://www.grpservices.com/pursuit/* Supporting Shearwater Research Products in Europe Narked at 90 Go Military Last edited by narked at 90 : 25th February 2007 at 00:40.
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25th February 2007, 00:35	#4 (permalink)
grandizer52 Sport Kiss & Shearwater Current Rebreather/s: Sport Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Sport Kiss Classic Kiss MK 15.X Other CCR Home Build Join Date: May 2006 Location: pearl city hawaii EARTH moving to Iscandar Posts: 254	Re: Dolphin CCR try increasing the intermediate pressure
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25th February 2007, 12:20	#5 (permalink)
Divein RBW Member Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Jun 2006 Location: Yorkshire Posts: 107	Re: Dolphin CCR Thanks for the advice. The Conshelf spring is likely to be extremely rare in UK. John, I do have the ADV in the inhale counterlung still but i will tweak the IP to see if that makes a difference. cheers.
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25th February 2007, 14:10	#6 (permalink)
spn2298 New Member Current Rebreather/s: Inspiration Classic Megalodon Sport Kiss Other Rebreather/s: Classic Kiss MK 15.X Join Date: Jan 2007 Location: Northern Mariana Islands Posts: 48	Re: Dolphin CCR In my case, I replaced a spring to the Scuba Pro G250. It makes possible for the demandvalve to work with normality I.P. Regards, Masa
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