lord1234
Contributor
I would really suggest calling Larry...he will know this stuff.
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DVRCARRIB:As far as facts, within the rules of this Forum here are the facts that prompted my post and why I am going to purchase my own CO detector.
There is some speculation that a batch of tanks were CO contaminated (allegedly) recently at a resort during a fill by a faulty compressor. The contamination problem was detected. The tanks were placed aside, emptied, and then refilled with clean air. The diveboat was loaded with the new tanks. A resort diver decided to join the diveboat at the last minute for a scheduled two tank dive. Two additional tanks were loaded on the boat from the dock. The divemaster grabbed one of the newly loaded tanks for himself and the other was used by the late arriving diver. Unfortunately, both of the newly loaded tanks were from the "bad air" batch---the had never been emptied off. Divers entered the water 1st for a planned 80ft max depth type dive, followed by the divemaster. Within minutes the divemaster surfaced was helped aboard and experienced a cardiac arrest. Due the irreversible binding nature of CO to Hemoglobin, he was unable to be resuscitated. The dive group was summoned back aboard and found to be minus one diver. A quick search was mounted and they found the late arriving diver dead in the water. All the resorts boats were called back and diving was suspended for the subsequent day until the remaining tanks were checked and double checked. (All circumstances are under investigation.)
DVRCARRIB:...
There is some speculation that a batch of tanks were CO contaminated (allegedly) recently at a resort during a fill by a faulty compressor. The contamination problem was detected. The tanks were placed aside, emptied, and then refilled with clean air. The diveboat was loaded with the new tanks. A resort diver decided to join the diveboat at the last minute for a scheduled two tank dive. Two additional tanks were loaded on the boat from the dock. The divemaster grabbed one of the newly loaded tanks for himself and the other was used by the late arriving diver. Unfortunately, both of the newly loaded tanks were from the "bad air" batch---they had never been emptied (allegedly). Divers entered the water 1st for a planned 80ft max depth type dive, followed by the divemaster. Within minutes the divemaster surfaced was helped aboard and experienced a cardiac arrest. Due the irreversible binding nature of CO to Hemoglobin, he was unable to be ressusitated. The dive group was summoned back aboard and found to be minus one diver. A quick search was mounted and they found the late arriving diver dead in the water. All the resorts boats were called back and diving was suspended for the subsequent day intil the remaining tanks were checked and double checked. (All circumstances are under investigation.)
lord1234:
Simple math shows that 360 ppm would be a bad thing for a recreational dive at depths to 90-100 fsw, and 200 ppm would be bad for a technical dive at 200 fsw.The median effective concentrations to produce incapacitation (EC50s) in rats have been determined to be 2,667 ppm and 1,450 ppm in 15 and 30 minutes, respectively [Hartzell et al. 1985].
BigJetDriver69:Any reference to a specific event has been removed, will continue to be removed, and it is requested that posters restrain themselves in this respect.