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  • Andrei Yashin's Ray
    White Sea Ice diving Andrei Yashin on the left diving his modified Ray I also added bubble deflectors They are made of foam rubber The nozzle is redesigned by me to use EAN 40 at 8 l min enough for me at all range of workloads Orifice diameter 0 3mm supply pressure 10 5 bar On the picture left Dräger standard unit on the right self made injector Pressure reducer

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/andrei_yashin_ray_mods.htm (2016-05-02)
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  • Oxydrant
    euronaut org There are also links to other European submarine projects For use onboard and for diving activities related to the building of there sub Stefan T even designed there own rebreather It is called the Oxydrant It has a multifunction layout and can be configured as Oxygen rebreather Constant Mass Flow Semi closed rebreather as Self mixing rebreather as KISS style rebreather and even as Electronically controlled closed circuit

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/oxydrant.htm (2016-05-02)
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  • Juha Haapajärvi Breathewise
    setpoint and injects oxygen in the loop This resulting in a larger gas volume in the loop asking for a valve to be opened Due to the bigger impact of depth changes in the 0 10 meter zone the unit will not be diving very stable in this area Juha exceeded in building an electronic controlled rebreather that does not maintain a fixed pO2 but a fixed fO2 The unit

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/juha_haapajarvi.htm (2016-05-02)
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  • Ivan's MCCR Dolphin
    drill and suits me fine now At 40m I only need 2 short bursts to bring the PPO² to level I could measure the bypass flow rate if required by someone I also fitted the Swagelock in line 15micron filter just after the O² 1 st stage as well as the O² gauge During a dive you don t look at the gauge anyway so why put it over your shoulder another hose Hanging around One thing I would like to mention I got a bit scared reading all the different warnings regarding the depth compensation on the O² 1stage regulator Well I had a Poseidon Jetstream which I like a lot so had to look for closing off the ambient pressure above the diaphragm Here is my solution I soldered a 6mm SS bolt in the end cap where normally the hex The hole is for adjusting the intermediate pressure I also soldered the end cap to the diaphragm cap By doing so it is easier for the annual maintenance No sealant should be removed which is a hell of a job Of coarse one would say yes but now you can t adjust the intermediate pressure by Allen key Yes but I adjusted the intermediate pressure by placing a SS washer above the spring and gave me 9 5 bar Adjusting the O² flow can easily be altered through the Swagelock needle valve The point where I inject the O² is in the original bypass valve I used an original orifice and removed both the Rubin flow restrictors The plastic tubes I leave in place The original bypass was moved to where the OPV was fitted Then the OPV was moved to where the Original P connector on the back side of the inhalation lung Normally Plugged The OPV manual function had to be removed and was easily done after opening the valve by fitting two of the shelf O rings So no additional holes had to be made in either breathing bag For the PPO² monitoring I use MY VR3 with O² sensor which fits in the P connector where normally the bypass valve is fitted The second sensor was fitted using a PVC HP cross Michel Urbani design This means that very easily a second so 3 in total O² sensor can be added in the inhale side I will add a 2 nd sensor in this cross at a later stage The PVC cross was a little bit shortened as well as the standard screw fittings using a lathe When fitting the cable through a cable gland and in my case an elbow a friend of me pointed out that he had had a lot of trouble with water coming in He advised to cut the wires 4 in my case solder them independently together feed them through the cable gland making sure the soldering connections don t touch each other not easy and fill the whole with epoxy resin If one looks at the

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/ivan%27s_mccr_dolphin.htm (2016-05-02)
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  • Brent Duck Tape Dolphin
    DS4 feeding a fixed IP to the magic push button This used to be a Swagelok micrometric metering valve with a variable IP first stage until I broke it The Bob Howell OC DSV is connected to the Dil cylinder via a flow stop The Bob is actually made for an Inspiration but more of the adaptors later on Hopefully more of it makes sense when you see the rear Bail out on the bottom is not Oxygen just the label has not been changed to Nitrox tut tut I know I know The adaptors on the 5ltr are temporary I have a more direct adaptor being fixed Dil on the left oxy on the right The problems that needed to be solved to change this semi closed into a closed circuit rebreather are all simple ones which need a bit of thought Broken down simply The tidal volume available in the standard Drager was insufficient for an easy work of breathing and efficient use of gas so a backplate arrangement was made that lifts the shell of the rebreather away from my back by an additional 35 40mm to allow for a full lung exchange with the rebreather The backplate is locked onto the shell with these lock tags I made Fast and secure The weight is held by the dog in the centre foreground Here s a close up of the retainer and my shite stainless welding The other half make s ense The main difference between the semi closed and the closed is that the closed circuit does not want to bleed gas out of the lungs to work The over pressure valve OPV was modified to allow a closed position with a high static lift pressure to prevent loop losses This means that before the lungs will burst the valve will give but loop volume control is more a manual task than automatic by the OPV Diluent is fed from an Xstream 1st stage to a primary manifold which splits the feed for the Ray ADV with no orafice and to the schrader fitting The schrader fitting connects to the secondary diluent manifold on the front right chest strap Hopefully this is self explanatory This system keeps all the main hoses fitted inside the cordura nylon of the wings structure except the Bob feed hose and 6 dry suit inflator Oxygen addition is via a contsant mass flow orifice CMF valve supplied by Hydrogom in Holland write up here http www therebreathersite nl 01 Informative hydrogom cmf valve htm This is a brute of a valve which weighs a ton As the human body uses oxygen at a known rate this valve feeds a little below this rate allowing a manual top up at suitable intervals Having run my unit as a semi closed for some time I was acutely aware of my own metabolic rate of consumption by using a calculator available here http homepage ntlworld com brent h information rebreather O2 Metabolism Calculator xls

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/brents_dolphin.htm (2016-05-02)
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  • Biopak 60 Biopak 240 rebuild
    in the North Sea dove a CCR 1000 outside of a lockout bell at a depth of 1 500 1 800 fsw The discrepancy arises from my recollections of the article on that feat that I have to find in my files and Mikes memory of the event The only modification to the unit was a baffle system incorporated into the Center Section that allowed hot water to flow around the Center Section to keep the scrubber warm The diver used a diving helmet with modified intake and exhaust flapper valves The Navy was also interested in these rebreathers and commissioned BioMarine to develop the Mark 15 which was essentially a copy of the CCR 1000 with some military style modifications such as Tritium filled gauges and modified harnesses The Mark 15 emerged from BioMarine somewhere between 1972 74 BioMarine continued to make modifications to small parts of the units including the electronics which ended with Revision G electronics The first units delivered to the Navy were Mark 15 Mod 0 units An off shoot of the CCR 1000 was developed by BioMarine in 1973 74 and was called the BioPak 45 The BioPak was designed for fire fighters and gave them a 45 minute overall breathing duration This was later followed up with the BioPak 60 1974 75 and the BioPak 240 in 1984 Around the mid 70 s the Navy asked BioMarine to develop a non magnetic rebreather based upon the Mark 15 The first of these new non magnetic rigs were the NM 2 1976 and the NM 6 1977 These were the first prototype Mark 16 s The Navy used the Mark 15 s and tested the NM 2 and 6 until around 1979 when they ordered the first Mark 16 s The initial order was for 96 units According to Mike some of the technical hurdles they had to deal with in the development of the Mark 16 was the need for the unit to be completely non magnetic This provided a lot of challenges to the company and its vendors including the use of some then rather exotic materials and processes The Navy followed the first order of 96 Mark 16 s with another order of 124 Thus the total number of Mark 16 systems built by BioMarine was 224 In the early 80 s the Navy also asked BioMarine to develop upgrades to the Mark 15 s that the Navy had in inventory The addition of Inconel Spheres made by Tavco of Chatsworth CA which were standard equipment on the Mark 16 and other non magnetic materials including the Mark 16 Center Section yeilded the Mark 15 5 Thus the Mark 16 was developed BEFORE the 15 5 Meanwhile in 1980 BioMarine Industries was acquired by a company based in Milwaukee Wisconsin called Rexnord Rexnord s main product line up until this acquisition was plastic conveyor belts and belts used on cement trucks From 1980 to 1987 BioMarine operated some of their product

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/biopak_60_biopak_240_rebuild.htm (2016-05-02)
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  • Hilfiger CCR
    guess I am at the ground floor of a very very long self learning process now The test finished after almost 2 hours underwater with a still sealed almost dry fully operating rebreather and myself alive which made me feel for a moment proud of myself So enough going now to the specs of the machine no name yet gladly accepts ideas Lungs Over the shoulder design Made from plastic normally used against humidity in house isolation Three times hot welded in the sides Volume app 5 lt each Outer bags made from material used to make sails Couldn t find cordura here They are too short I ll enlarge them in the next edition I sewed them in such a way that when inflated they take the curve of between the chest and the shoulders Took time to figure that out from nothing The inhale CL has a AP dry suit inflation valve whereas the exhale CL has a Northern Diver dry suit inflation valve which makes mistakes in injection very difficult Also there is a op valve used in Viking suits at the bottom of the exhalation CL to clear excess water Scrubber I decided for an axial design due to my financial limitations in workshops An outer case isolates the scrubber The capacity of absorbent can be varied with the use of different inner case lengths I have at the moment two sizes 1 5 and 2 5 kg of absorbent The highest weight I can possibly carry is ca 3 3kg I think for my early requirement that is more than enough There are two sealing o rings between the outer case and the inner case Both work good avoiding the bypass the scrubber The inner caps are joined by a long screw thus screwing against each other which makes the packing process quite fast and safe in terms of channelling I decided not to perforate the complete inner lid so when water eventually gets there it can be retained there longer and or trapped by absorbent pads The outer case with its lids and inner lids are from PVC U The inner sleeve is made of transparent acrylic Naturally there are filters and SS wire net at both ends Hoses and DSV After taking my drawings to different machine shops and see what they would cost i decided for the simplest thing Draeger Ray hoses and mouthpiece T pieces and connectors From PVC U bought in a plumbing section of a big shop here Richter Kiel I made some o ring routings with a Dremel machine and unbelievable it worked not at the first time of course but it worked I m buying a lathe as soon as I can Backplate and Wing I installed everything over a homemade SS backplate and in between I mounted an experimental wing that I made also from scratch with spare parts of an old bc I had nothing else than an old Tommy Hilfiger bag the night I

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/hilfiger_ccr.htm (2016-05-02)
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  • Modified AGA Mask
    look down To get over this there needs to be a compromise in mobility and ease of water clearance To start I had to reverse the hole dsv so the second stage is on top not underneath But this means some small changes to the dsv reversal of the valves and the turning or removal of the scoop plate as the scoop when things are reversed starts to work against you The problem with water being purged from the second stage is cured by tilting the head forward which make water removal much better With this configuration I have no problems with movement in any direction Now there a few problems I have encountered the mask still had the gas path over the visor then into the nasal cup which works ok but if you had any resistance on exhale you get a back pressure which pushes bad gas back over the visor and starts a co2 loop I took a hit about 4 weeks ago so can tell you its not pleasant and even if you bail to o c on the mask it dose not help as the problem is still with you in the mask To stop this I have blocked the gas path over the visor and removed the valve in the centre of the conversion seen in the first picture then you need the reverse the valves in the nasal cup so the mask still equalises I find that I can not run min loop with the mask as it becomes uncomfortable when you inhale so I run a little more volume My only other problem is my face And the mask vents to much gas but I have a fix for it just need to get around to fitting some special neoprene to the

    Original URL path: http://www.therebreathersite.nl/06_Homebuilders/modified_aga_mask.htm (2016-05-02)
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