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Water temp effect on scrubber performance

Discussion in 'Rebreather Diving' started by igoRluse, Aug 29, 2004.

  1. igoRluse

    igoRluse Instructor, Scuba

    # of Dives: 200 - 499
    Location: Perth, Western Australia
    Hi all,

    I have just been reading the doc from Dräger discussing the scrubber time increase from 70 mins to 110 mins of the Ray scrubber. I have put it in the resources section of my site for reference.

    Now this shows that under normal levels of exertion a recreational diver would have to handle with, the scubber duration goes to 110 mins, but this is in water at -2°C !!!

    Myself I would pretty much never have to deal with water under 16°C even in the midst of winter so how will that affect the scrubber performance? Does anyone know of any test run on this?
  2. iain/hsm

    iain/hsm Manta Ray

    I cant get your site up so can't fully comment. However it may turn out that this is a typo. The test water temperature is normally 4 degrees Centrigrade with a tolerance of plus or minus 1 deg C Its problerbly the +/- bit thats the typo.
    However I wouldn,t mind seeing the detail if you could post or email the full spec.

    What you have posted looks a bit slight on the other factors.
    C02 injection in the bag is normally 1.6 litres per minute in the test, injecting only 1.2 l/min will of course increase the scubber chemical lifetime for a given C02 loading.
    0.5% breakout is the same on both tests.

    Again the oxygen simulated absorbsion is normally tested by removing 1.78 l/min from the exhaled gas simulator.
    Your figure of 1.2 l/min is again light. Also BTPS (Body Temperature Pressure Saturated) figures are very low.
    It may sounds like breathe less to last longer!! but a least you have some proper test data to work from.
  3. igoRluse

    igoRluse Instructor, Scuba

    # of Dives: 200 - 499
    Location: Perth, Western Australia
    Strange, site seems to be up. Anywho, I attached the doc in question.

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