Radial Scrubber


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The Radial scrubber is the older scrubber in design. Radial scrubbers are most times used in two hose breathing and pendulum breathing loops, sometimes even with split counter lungs. There is a very old discussion on the efficiency of this scrubber type versus axial models. Only very complex tests show that the quantity of scrubber material, flow, form of the housing and many other factors determine the quality of a scrubber. Axial or Radial is not a general recipe for a  good or bad scrubber.

A radial flow scrubber is a scrubber design in which the breathing gases move from the middle to the outside (or vise-versa) through the scrubber.  The most common example is the current military rebreather built by Sherwood and Fullerton in Canada.  An example of a simple radial flow scrubber would be to start with a coffee can, then insert a tube into the middle of the coffee can from the top.  Punch holes in the middle tube and the outside of the coffee can.  The top and bottom of the can should be sealed (with the exception of one end of the middle tube).  Now the breathing gases must move "radially" in the canister.  Contrast this with "Axial flow scrubber" 
This example shows the scrubber of the Biopak 60 converted for the use with diluent as a manual operated CCR rebreather. The design was original for fire fighting.

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