Modifying a Dolphin for use <50 metres

dolph · 7th October 2007, 06:33

My wife is considering buying a Dolphin as she prefers the simplicity of operation compared to her CCR. The majority of her planned diving is in 40 metres or less but we do have regular access to an area with many wrecks in the 48 metre range.

I note from Draegers sales blurb that the standard unit is good for 40 metes based on a 32% mix @ 1.6. In an ideal world she would choose to dive a 26% mix and limit her depth to 50 metres.

Any advice that can be offered for the suitability of the Dolphin for this application and, the neccessary modifications would be gratefully received.

Doorduijn, Niels · 7th October 2007, 07:21

Quote: (Originally Posted by dolph)

My wife is considering buying a Dolphin as she prefers the simplicity of operation compared to her CCR. The majority of her planned diving is in 40 metres or less but we do have regular access to an area with many wrecks in the 48 metre range.

I note from Draegers sales blurb that the standard unit is good for 40 metes based on a 32% mix @ 1.6. In an ideal world she would choose to dive a 26% mix and limit her depth to 50 metres.

Any advice that can be offered for the suitability of the Dolphin for this application and, the neccessary modifications would be gratefully received.

I am not sure about the scrubber (it is a small one), but keep in mind the gas requirements. The gas needed to keep the PpO2 at an acceptable level at 50 meters would have a FO@ which is too low for the shallower parts of the dive. There are undoubtedly possibilities to modify the unit, f.e. by using a gass switch. However, in my view, you are then loosing the simplicity which is the reason you are contemplating a Dolphin.

Rgs,
Niels

Captain Randy · 7th October 2007, 11:49

This is a good article

http://www.rebreatherworld.com/semi-...-reposted.html

also try reading through the semi closed forum for more information.
As for the above post about the small scrubber you can get the extend air scrubber. The Dolphin cartridge is the same as the Optima

Randy

dolph · 7th October 2007, 13:52

Thanks very much Randy - I shall spend some time trawling as suggested.

Cheers

dolph · 7th October 2007, 13:53

Thanks Niels - I have some study and learning to do!! Many thanks

7th October 2007, 06:33	#1 (permalink)
dolph New Member Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Aug 2005 Location: Singapore Posts: 14	Modifying a Dolphin for use <50 metres My wife is considering buying a Dolphin as she prefers the simplicity of operation compared to her CCR. The majority of her planned diving is in 40 metres or less but we do have regular access to an area with many wrecks in the 48 metre range. I note from Draegers sales blurb that the standard unit is good for 40 metes based on a 32% mix @ 1.6. In an ideal world she would choose to dive a 26% mix and limit her depth to 50 metres. Any advice that can be offered for the suitability of the Dolphin for this application and, the neccessary modifications would be gratefully received. Last edited by dolph : 7th October 2007 at 06:39.
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7th October 2007, 07:21	#2 (permalink)
Doorduijn, Niels Custom Title Allowed! Current Rebreather/s: Inspiration Classic MK 15.X Dolphin Other Rebreather/s: Dolphin Join Date: May 2005 Location: Netherlands Posts: 53	Re: Modifying a Dolphin for use <50 metres Quote: (Originally Posted by dolph) My wife is considering buying a Dolphin as she prefers the simplicity of operation compared to her CCR. The majority of her planned diving is in 40 metres or less but we do have regular access to an area with many wrecks in the 48 metre range. I note from Draegers sales blurb that the standard unit is good for 40 metes based on a 32% mix @ 1.6. In an ideal world she would choose to dive a 26% mix and limit her depth to 50 metres. Any advice that can be offered for the suitability of the Dolphin for this application and, the neccessary modifications would be gratefully received. I am not sure about the scrubber (it is a small one), but keep in mind the gas requirements. The gas needed to keep the PpO2 at an acceptable level at 50 meters would have a FO@ which is too low for the shallower parts of the dive. There are undoubtedly possibilities to modify the unit, f.e. by using a gass switch. However, in my view, you are then loosing the simplicity which is the reason you are contemplating a Dolphin. Rgs, Niels
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7th October 2007, 11:49	#3 (permalink)
Captain Randy New Member Current Rebreather/s: Dolphin Ray Other Rebreather/s: Dolphin Ray Join Date: Dec 2005 Location: Houston, Texas Posts: 44	Re: Modifying a Dolphin for use <50 metres This is a good article http://www.rebreatherworld.com/semi-...-reposted.html also try reading through the semi closed forum for more information. As for the above post about the small scrubber you can get the extend air scrubber. The Dolphin cartridge is the same as the Optima Randy
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7th October 2007, 13:52	#4 (permalink)
dolph New Member Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Aug 2005 Location: Singapore Posts: 14	Re: Modifying a Dolphin for use <50 metres Thanks very much Randy - I shall spend some time trawling as suggested. Cheers
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7th October 2007, 13:53	#5 (permalink)
dolph New Member Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Aug 2005 Location: Singapore Posts: 14	Re: Modifying a Dolphin for use <50 metres Thanks Niels - I have some study and learning to do!! Many thanks
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