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  • Halcyon Passive SCR
    semi closed passive addition rebreather The rebreather is the predessessor of the RB 80 and sometimes is called Big Hall Thanks to Martin Lutz Many thanks to Martin Lutz for

    Original URL path: http://www.therebreathersite.nl/10_Semiclosedrebreathers/halcyon_passive_scr.htm (2016-05-02)
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  • SM1600
    side A plastic support screen separates the cannister form the moisture absorbant foam pad Finally the lexan dome is installed onto the center section sealing it and leaving only the inhalation and exhalation ports open The clear dome allows a visible check of moisture water inside the center section without breaking the seal The raised star shaped ridges allow condensation moisture to accumulate and drain into the inhalation bag The diaphragm that makes up the counterlung sits on the opposite side of the centersection and is fitted with a baseplate and an OPV to prevent damage due to improper venting With some training the OPC allows to expell some water from the loop As the center section was bolted into the case and my time with the unit limited I didn t get a chance to photograph that entire side of the SM1600 The design of the center section is the hallmark of the MK series and an exercise in brilliant rebreather design This is even more appearant when considering the age of the original design 1960s and the problems some recent designs have with condensation across the sensor faces Once the gas has passed through the scrubber and is moist and warm it hits the lexan dome and its flow gets split It is here and then that most of the condensation occurs with the resulting moisture trapped in the foam pad Some of the gas flows though the slots in the outer rim of the center section into the counterlung The rest is routed to the inhalation lung through the hole in the center where the sensors are placed The combination of condensation along the dome and foam pad reducing the amount of gas entering the sensor space and placing the sensors in the warmest possible area enclosed by the scrubber successfully prevents condensation problems on the sensors The pipe work and plumbing of the MK series BACK TO THE INDEX Intimidating to see for the first time the layout is actually quite simple The diluent tank and all its related valves piping and filter are on the left All of the O2 is on the right The electronically controlled gas addition components are top on centerline while the electronics are on the bottom centerline On the very top is the clamp that secures the lexan dome There is another one on the opposite side and both are secured with a large O ring encompassing the entire center section Diluent enters the pipework through the yoke style first stage which takes it to the 60 mc filter From there it goes to a T section that supplies both manual and automatic diluent addition On the left side of the case is the easy to locate yet well protected manual diluent addition button The automatic gas addition is piped into the center section by the upper connection Both automatic and manual addition is directly into the counterlung to provide a fresh known gas when needed The bigger lower plug is a Bendix connector that feeds the current generated by the three sensors with the electronics pod The pipe work for the O2 supply mirrors the diluent side the gas is routed through a filter and split by a T section Instead of feeding gas to an ADV one end supplies the accumulator for electronic injection The other routes the manual addition supply first to the valve and then into the center section The manual O2 addition button is in a similar position on the right side of the case and as on the left side there is a latch that secures the lid Here a close up of the O2 filter and centersection connections Also clearly visible in this shot is the mix of metal piping and clear flexible though not soft tubing This differs from MK15 and MK16 as well as other versions of the MK15 5 Steam Machines used the transparent tubing to enable the diver to visually check the gas supply for contamination or moisture The steel pipe leading into the centersection feeds O2 Both electronic and manual addition inject before the scrubber to aid mixing O2 with the gas in the loop The big connector with the black cable goes to the secondary which is completely independent of the primary The red gizmo is the cover of the solenoid Using a solenoid valve to electronically control O2 addition is a commonality between the MK15 and 15 5 designs whereas the MK16 uses a piezo electronic valve The metal container placed perpendicularly between the solenoid and the centersection is the accumulator It assures that a measured amount of O2 50cc at 1ata is injected into the loop every time the solenoid opens THE SENSORS BACK TO THE INDEX Here is another look at the sensors through one of the mounts The face of the sensors is clearly visible facing towards the center with all three of them on different planes The piping in the middle is the diluent supply line for the plunger activated ADV When the diaphragm bottoms out the striker plate in its center hits the plunger style ADV and opens the valve Steam Machines used its propriatory SMS202 sensors One can be seen here next to the analog secondary measuring the ambient air and reading 21 bar pO2 Designed by Steam Machines for use in an UBA and manufactured for them the SMS202 are high output sensors generating between 16mV and 22mV during their useful life span Which like most other sensors is one year The high output is needed to drive the analog needle gauge basically a mV meter with a pO2 scale on its face It runs directly off the current generated by the cell without the need for a separate power supply or any other connection to the electronics That makes the analog secondary one of the most important safety features of the MK15 MK15 5 and theSM1600 It provides a separate and completely independent pO2 readout from the primary

    Original URL path: http://www.therebreathersite.nl/05_Reviews/sm1600.htm (2016-05-02)
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  • Aegir 1982 project

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    Original URL path: /02_Photo_Galleries/Walkerfiles/Aegir/aegirwalkerpage.htm (2016-05-02)


  • Egypt 2006
    hours underwater with Inspiration rebreathers Since we where the only rebreather divers on board we received a proud group name Therebreatherguys Divers Tino de Rijk Rita Oosterbaan Andre Schrama Ivo van Dam Janwillem Bech Dive guides Juan C Martinez and Khaled Elswah Boat MY Hurricane Organization Tony Backhurst The crew was a fantastic team helping with everything you wanted The boat is equipped rebreather friendly with booster oxygen helium and sofnolime for very reasonable prices If you want to dive your rebreather in the Red Sea then MY Hurricane is one of the best boats to choose The trip was made in the Southern part and middle part of the Red Sea We visited Elphinstone Reef Big Brother Little Brother Daedalus Rock Ras Marsha Shuna and Marsa Alam The Hurricane is a 36 m ship with 2 x 760 HP engines and is equipped with airco Fill compressor Inspiration bottles Booster Helium all is there Juan filling bottles with oxygen Although most diving dreams came true there were other divers too Exclusivity is not assured anymore Unfortunately this was one of the down sides Some spots had 11 boats visiting the same dive site Since these big boats especially Hurricane

    Original URL path: http://www.therebreathersite.nl/02_Photo_Galleries/egypt_2006.htm (2016-05-02)
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  • Eindelijk weer eens lekker onder het ijs
    4 x OC Our usual North Sea wreck diving group this time hunting for well ice We went looking for our original selected diving spot only to find out that icebreakers had ruined it in order to keep a lane open for boats Why They have the rest of the year already to pester our diving spots with ships Can t they just keep a short holiday So we packed it up and went to the next spot a diving club with its own small lake which was separate enough to cut a hole in it In this time of the year you do NOT get very popular if you cut a whole in the middle of a skating rink A short Police visit confirmed we could go ahead with ruining the ice JW was well prepared and within 15 minutes his trusty chainsaw now probably completely ruined had cut a nice big triangular hole in 16 cm thick ice Depth check a whopping 2 meters of water between ice and muddy bottom Not exactly a depth record but most likely a low viz record We borrowed some stuff from around the spot including some nice red white traffic control poles to indicate to unsuspecting skaters that this was NOT the place to be And we even found a nice left over ladder to ease the going in out of the water The diving went quite smooth We had 50 meter signal lines to allow us to get far away from the hole to slightly less murky water It is quite intriguing so see people walk on top of you and waving to you The silence of the rebreathers even allowed us to hear them The Inspo s were boring They refused to follow Mrs AM and Mr AD s advice to pack up on us They stubbornly did what they were supposed to do do their job without any problems Quite frustrating SO I decided to raise the ante a bit and challenge my own Inspo a bit further After having finished my dive I had to walk back to shore on the slippery ice I guess you can see where this is going Thinking steady steady I wasn t steady at all for a brief moment and made The Mother Of All Crashes on the ice Image a 190 cm long 100 kilo white haired guy with some 40 kilo s of kit on his back crashing full speed on his left shoulder Highly NOT RRRecommended I was actually surprised the ice didn t break It must have caused a quake of at least 4 on Richter s scale and unfortunately one with level 7 in my left shoulder I used some words that Gordon s profanity filter will for sure NOT let through here After my lovely wife Rita support diver Hans had taken the kit off me I could examine the damage Inspo Tino 1 0 As in Kit was 100 o k despite the yellow

    Original URL path: http://www.therebreathersite.nl/02_Photo_Galleries/Icediving2009/IcedingHolland2009.htm (2016-05-02)
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  • Duiken in de veemarkthallen
    PAINTING well done Melvin gives feedback to the operational center Kitchen and door are build in one hour Now we have te eat the well earnt high quality BIO food made of pure oil Kees enjoyes a here the actual standbuilding starts fashion or rebreather fair ok fashion it is special stands for the WWII pirelli and the Draeger 1936 rebreather KG 130 now we are talking here you see Melvins Russian gear Some of the old units displayed with modern technology Jeroen offered me a very nice old Siebe mouthpiece He also took a book showing how the mouthpice was worn A try out was organised on the spot Kees and Maria Shallow water helmets Miller Dunn shallow water helm from USA florida This tank was used by the shallow water helemt divers and some demonstrations of the firebrigade shallow water helmets in action Visit of a member of the Royal Dutch Family Prof Mr Pieter van Vollenhoven Pictures thanks to Jan de Groot Kees en Maria Jeroen en Patricia en Jan Willem Hope to meet you next year on Duikvaker Created 11 02 2009 Please sign my Guestbook E mail jw bech quicknet nl Last 7 and 8

    Original URL path: http://www.therebreathersite.nl/02_Photo_Galleries/Duikvaker2009/Duikvaker_2009.htm (2016-05-02)
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  • An early rebreather
    ongelofelijk tegelijk Stel je voor dat beide heren op bijna 1000 meter diepte bij een druk van 101 bar in een kogel door een glazen raampje zaten te kijken Above you can see the equipment these unbelievable brave voyagers took with them You can clearly see that two small cylinders of oxygen were taken The book tells that respiration by the two scientists was completely provided for by the Bathyscaaf They managed to do so by taking Protosorb with them This material caused a chemical reaction with the carbon dioxide that was exhaled By adjusting the oxygen supply to the metabolism of the two occupants a balance was created The correct amount of oxygen was easily measured by a pressure gauge As soon as an overpressure was noticed the flow was turned down A touch of genius but also unbelievable Imagine both gentlemen at a depth of almost 1000 meter with a pressure of 101 bar looking out of a little glass window of a steal ball Hier ziet U dat voor het sluiten van de hoofddeksel er zuurstofcilinders werden aangereikt Ook is hier fraai het type afdichting te bewonderen Hoe kreeg men in 1930 een flens drukvast dicht bestendig tegen een druk van meer dan 100 bar Wel relatief eenvoudig Er werden 10 zeer zware bouten gebruikt en het deksel werd met loodwit loodoxidant met afdichtende werking een soort ouderwetse loctite ingesmeerd Hierna werden de bouten met zware hamers aangeslagen tot groot ongenoegen van de inzittenden Here you can see that before the main hatch was closed the oxygen cylinders were handed Also you can admire the type of sealing material How in 1930 was it possible to protect a flange against a pressure of more than 100 bar Well relatively simple Ten very heavy bolts were used and the hatch was greased with white lead lead oxidant with sealing activity a kind of old fashioned loctite After that the bolts were hammered into the ball which was not at all appreciated by the occupants Na elke tussenperiode of modificatie van de bathyscaaf werd een test uitgevoerd tot op de beoogde diepte zonder bemanning Zo werd er omstreeks 1931 een nieuw glas geplaatst en werd de bathysfeer naar ca 400 meter neergelaten Na weer aan dek te zijn gezet bleek bij het losdraaien van de centrale vleugelbout dat er water in de sfeer zat Dit kondigde zich aan door een extreem piep geluid van een mengsel van water en lucht wat zich bij een druk van 41 bar wil bevrijden Het dek werd vrijgemaakt om ongelukken te voorkomen After every pause or modification of the Bathyscaaf a test was performed to a planned depth but without crew About 1931 new windows were placed and the Bathysfeer was descended to roughly 400 meter Back on deck after loosening the main vane bolt water was discovered in the Bathyscaaf It was detected because of its extreme peeping noise by a mixture of water and air that wanted to get out at

    Original URL path: http://www.therebreathersite.nl/03_Historical/een_vroege_rebreather.htm (2016-05-02)
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  • The Marion Rebreather
    of 68 5 pond for 27 25 inch during 5 x per minute during a period of 10 minutes while breathing from the rebreather The parameters do not seem randomly chosen The diver therefore moves in 10 minutes 10 x 5 x 453 6x 68 5 1 5 metric ton The Nedu report can be downloaded using the link below The Nedu report mentions a number of references to the photographs which have been incorporated in the same report These photographs are the only thing I could lay my hands on Together with the drawings from the patent we could form ourselves a nice picture of the unit It would however be terrific for our sport if we could document these original units For this reason I would like to end this article expressing the hope that in the near future I ll be able to give you more information on this particular invention and development You could add your contribution providing me with the answers to the following questions in any possible way Who has information about The Old Dominion Research and Development Corporation Who has information about Carl Herluf Holm and Elihu Root III Who can help me out with better photographs of these units Who has more information about the further development of these units If you want to download and print the patent you can download the pdf here The Nedu Report is available here 8mb thanks to The Rubicon Foundation Thank you for your interest I hoped you enjoyed the article Your reaction is Highly appreciated Please use the email on the bottom of this page De Nederlandse vertaling is niet voorzien van dezelfde links en afbeelding Aub in het Engelse deel bekijken The Marion Device Auteur Jan Willem Bech 13 juni 2007 Op het schrijven van dit artikel heb ik me al een paar weken verheugt Het is namelijk niet dagelijks dat ik een nieuwe rebreather herontdek met zeer bijzondere eigenschappen De herontdekking van deze rebreather is echter wel een zeer bijzondere gebeurtenis Tijdens de speurtocht naar fabrikanten van rebreathers kwam ik een aantal keren een naam tegen die vrijwel niet te traceren was Over de Old Dominion Development Corporation is als bedrijf in ieder geval niet veel informatie te vinden Ik had de speurtocht naar de producten van deze firma dan ook al eerder opgegeven Tot ik bij toeval een patent tegen kwam waar de naam van Carl Herluf Holm en Elihu Root III op voorkwamen Bij nadere beschouwing bleken deze heren de afgevaardigden van The Old Dominion Research and Development Corporation Uiteraard was toen mijn belangstelling gewekt en las ik het betreffende patent aandachtig door Tijdens het lezen besefte ik dat ik hier iets heel bijzonders gevonden had Tijdens mijn training als duiker en later als geïnteresseerde in de historie en ontwikkelingen van rebreathers heb ik altijd gedacht dat de Electrolung rebreather de allereerste rebreather was waarbij de partiele zuurstofdruk geregeld werd De Electrolung heeft de reputatie de eerste unit te zijn

    Original URL path: http://www.therebreathersite.nl/03_Historical/the_marion_rebreather.htm (2016-05-02)
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