Drager Dolphin Breakdown

Drager Dolphin Breakdown
By wedivebc


The Drager Dolphin has been kicking around since 1995 and some may argue that there are better units out there. You can't argue with the fact there are probably more Dolphins in use than all other rebreathers put together


The basic circulation of the Dolphin showing the path of gas through the loop


Nitrox mixes ranging from 60% down to 32% are delivered through 1 of 4 flow orifices. The unused flow orifices are blocked. Later Dolphins used a colour code to identify flow rates of the orifice. Here we see the gas supply connected to the one with the red ring. This indicates a 50% flow orifice. The blue one nest to it is for 40%


Here we see details of the dosage device showing the supply to the bypass (ADV) side of the unit


Left is an Atlantis canister next to a Dolphin canister. The Dolphin was rated for 3 hrs and is much more robust than the earlier Atlantis canister


The Dolphin canister lid is on the left and has a much heavier gasket. It is recommended to use a strip of electrical tape around the lip of the Atlantis (right) gasket to prevent leakage


Exhalation counter lung showing colour coded connector. Red indicates exhaled gas. Note canister has same colour coding. Over pressurization valve (OPV) is seen to the left of the hose connector.


Inhalation CL showing black hose connection on left and P-post for dosage device in centre. The little white ring on the right is the stowage position of the drain plug.


Mouthpiece and mushroom valves.


Dive/Surface valve (DSV) showing directional arrow and colour coding on hose securing nuts


Plastic shell with BCD and tank holder removed


BCD is made by Zeagle and provides plenty of lift for cold water diving. It has a number of SS D-rings for hanging things.


Here is my Dolphin all back together





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