Thought you all might be interested in some reading on Oxygen Toxicity. We just updated our "suggested reading list". I highly suggest the Butler article as a nice, easy to read summary of how the USN operational guidelines have changed over time.
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Oxygen Toxicity
Thought you all might be interested in some reading on Oxygen Toxicity. We just updated our "suggested reading list". I highly suggest the Butler article as a nice, easy to read summary of how the USN operational guidelines have changed over time.
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"Oxygen is addictive and deadly. Everyone who uses it will eventually die" --RW Hamilton, PhD 1991
Oxygen Partial Pressure and Exposure Time Limits for Nitrogen-Oxygen Mixed-Gas Working Dives (from NOAA 1991 Diving Manual)
TABLE 4
Normal Operations:
Oxygen Partial Pressure (ata)/
Maximum Duration for a Single Exposure (min.)1.6 ata/45min
1.5 ata/120min
1.4 ata/150min
1.3 ata/180min
1.2 ata/210min
1.1 ata/240min
1.0 ata/300min
0.9 ata/360min
0.8 ata/450min
0.7 ata/570min
0.6 ata/720min
Oxygen Partial Pressure (ata)/
Maximum Total Duration for any 24-Hour Day (min.)
1.6/150
1.5/180
1.4/180
1.3/210
1.2/240
1.1/270
1.0/300
0.9/360
0.8/450
0.7/570
0.6/720
Exceptional Exposures:
Oxygen Partial Pressure (ata)/Time (min)
2.0 ata/30min
1.9 ata/45min
1.8 ata/60min
1.7 ata/75min
1.6 ata/120min
1.5 ata/150min
1.4 ata/180min
1.3 ata/240min
From the DAN Article from Dr. E.D. Thalmann (disagree though with confusing toxing/convulsing diver rescue as explained).
I find the Exceptional Exposure Table above compelling for a last resort high PO2 bail out to Deco Gas contingency --for instance when backgas is totally exhausted for whatever reason. . .
Last edited by kevrumbo; 03-01-2008 at 12:52 AM.
"There are no mistakes. The events we bring upon ourselves, no matter how unpleasant, are necessary in order to learn what we need to learn; whatever steps we take, they're necessary to reach the places we've chosen to go."
Read the first few pages just now- really good article, so far- can't wait to read the rest of it later. Thanks for posting it!Originally Posted by Gene_Hobbs
Joshua Smith
COPIS Meg Diver
-Molon Labe-
GLAD you like it!
This was posted a long time ago and we added another good overview by Hamilton to that list a couple of weeks ago. Hamilton Jr, RW. Tolerating oxygen exposure. SPUMS 1997 Volume 27 Number 1. RRR ID: 6038
Kev, the source material for the Thalmann article NOAA tables is Hamilton's REPEX work (1, 2) and the older US Navy work from 1954 is by Lanphier and Dwyer (3). **I highly suggest reading this report... VERY cool history in there.
1. Hamilton RW, Kenyon DJ, Peterson RE, Butler GJ, Beers DM. REPEX: Development of repetitive excursions, surfacing techniques, and oxygen procedures for habitat diving. Technical Report 88-1A. Rockville, MD: NOAA Office of Undersea Research, May 1988. RRR ID: 4865
2. Hamilton RW, Kenyon DJ, Peterson RE. Repex habitat diving procedures: Repetitive vertical excursions, oxygen limits, and surfacing techniques. Technical Report 88-1B. Rockville, MD: NOAA Office of Undersea Research, May 1988. RRR ID: 4866
3. Lanphier and Dwyer. Diving with Self-Contained Underwater Breathing Apparatus. Reports 1 - 11. NEDU Reports 1 thru 11. Chapter 8. RRR ID: 3323
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"Oxygen is addictive and deadly. Everyone who uses it will eventually die" --RW Hamilton, PhD 1991
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