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womble · 6th November 2007, 20:20

Quote: (Originally Posted by Drmike)

theres 2 types of CO2 hit

1) Where you are retaining more CO2 than you are eliminating (when breathing out) due to over exersion, poor ventilation, high , stress, etc.

2) Your loop is failing to scrub out all your expired CO2 (Expired scrubber, breakthru, check valve failure)

If (1) the scrubber is still working so you dont have elevated (any) CO2 in the inhale side of your loop - ergo a dil flush will be of no use for retained CO2 hit.

If (2) a dil flush will reduce CO2 momentarily in the loop but CO2 levels will rise again (unless you run semiclosed or maybe reduce workrate)

That makes sense.
So why do they teach dil flushes as the first-line-of-defence measure??

6th November 2007, 20:20	#72 (permalink)
womble RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: UK Posts: 199	Re: C02 Retention / Decay times Quote: (Originally Posted by Drmike) theres 2 types of CO2 hit 1) Where you are retaining more CO2 than you are eliminating (when breathing out) due to over exersion, poor ventilation, high , stress, etc. 2) Your loop is failing to scrub out all your expired CO2 (Expired scrubber, breakthru, check valve failure) If (1) the scrubber is still working so you dont have elevated (any) CO2 in the inhale side of your loop - ergo a dil flush will be of no use for retained CO2 hit. If (2) a dil flush will reduce CO2 momentarily in the loop but CO2 levels will rise again (unless you run semiclosed or maybe reduce workrate) That makes sense. So why do they teach dil flushes as the first-line-of-defence measure?? __________________ "What could possibly go wrong?? . . "
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