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User:Pbsouthwood/Rebreather notes

< User:Pbsouthwood

Dräger Ray edit

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    Dive-surface valve and breathing hoses of a Draeger Ray semi closed rebreather
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    Dive-surface valve of a Draeger Ray semi closed rebreather
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    Scrubber canister of a Draeger Ray semi closed rebreather
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    Top end of Scrubber canister of a Draeger Ray semi closed rebreather
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    Components of Scrubber of a Draeger Ray semi closed rebreather
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    Interior of Scrubber canister of a Draeger Ray semi closed rebreather
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    Regulator, bailout DV, CMF dosage and ADV, SPG and hoses from a Draeger Ray semi-closed rebreather
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    Constant mass flow orifice and automatic diluent valve from a Draeger Ray semi-closed rebreather
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    Components of a constant mass flow orifice and automatic diluent valve from a Draeger Ray semi-closed rebreather
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    Internal view of a constant mass flow orifice and automatic diluent valve from a Draeger Ray semi-closed rebreather
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    Draeger Shark scuba demand valve used as bailout DV on a Draeger Ray semi closed circuit rebreather
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    Draeger first stage regulator used on a Draeger ray semi closed rebreather
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    Harness, buoyancy compensator and counterlung assembly of a Draeger Ray SCR back view
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    Draeger Ray SCR showing scrubber canister installed
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    Draeger Ray SCR showing DSV connected to counterlungs. The scrubber is flipped up to show the hose routing
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    Draeger Ray SCR showing scrubber and ADV fitted and secured in place.
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    Draeger Ray SCR showing scrubber and ADV fitted and with cover in place - back view
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    Ballast weights for the Draeger Ray scrubber cover pockets
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    Protective cover for Draeger cylinder valve for Nitrox
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    Draeger Ray SCR showing scrubber and ADV fitted and with cover in place - side view
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    Flow meter in box as supplied with Draeger Ray semi closed rebreather
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    Flowmeter as supplied with Draeger Ray semi closed rebreather
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    Flowmeter as supplied with Draeger Ray semi closed rebreather
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    Carrying case for Draeger Ray semi closed rebreather

Dräger Dolphin edit

Passive addition/Demand controlled edit

Ventilation equivalents vary between individuals but are generally considered to be within the range of 15 to 30 but have been recorded as low as 10 [1]

Divers as a group tend to have a lower ventilation equivalent (than average) [2]

Independant laboratory tests done on a RB-80 indicate that the oxygen fraction in the breathing loop calculated from the formula FiO2 = FsO2-(1-FsO2)/(K*r*PA) slightly overestimated, and the Nuckols formula slightly underestimated the measured values for a range of depths and breathing rates. The actual values could vary significantly with variations in the ventilation equivalent K.[3]


[4]

[3]

[1]

[5]

[2]

References edit

  1. ^ a b Morrison, J.B; Reimers, S.D (1982). Bennett and Elliott's Physiology and Medicine of Diving (3rd ed.). Best Publishing Company. ISBN 0941332020.{{cite book}}: CS1 maint: multiple names: authors list (link)
  2. ^ a b Florio, J.T; Morrison, J.B; Butt, W.S. (1979). "Breathing patterns and ventilatory response to carbon dioxide in divers". Journal of Applied Physiology (46): 1076–1080.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. ^ a b Frånberg O, Ericsson M, Larsson A, Lindholm P (2011). "Investigation of a demand-controlled rebreather in connection with a diving accident". Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc. 38 (1): 61–72. PMID 21384764. Retrieved 2013-05-16.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ Nuckols, ML; Finlayson, WS; Newville, B; Gavin, WA Jr (2001). "Comparison of predicted and measured oxygen levels in a semi-closed underwater breathing apparatus". OCEANS, 2001. 3. MTS/IEEE Conference and Exhibition. Retrieved 2013-05-16.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. ^ Nuckols, M.L; Clarke, J.R; Marr, W.J. (1999). "Assessment of oxygen levels in alternative designs fof semiclosed underwater breathing apparatus". Life support and Biosphere science. 6: 239–249.{{cite journal}}: CS1 maint: multiple names: authors list (link)

Category:Underwater diving

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