Citation Source

Citation: K1

Document: NOAA Diving Manual Diving for Science and Technology 4th edition NOAA 2001

Page: 399

Section: 14-10 NOAA Diving Manual NO TES

Source confidence: 75%

Cited Passage

These symptoms represent a toxic response to oxygen exposure, and may serve as a warning about an impending convulsion; however, a convulsion can occur without any warning. 16.2.2 Managing Oxygen Exposure The core of countermeasures for avoiding oxygen toxic- ity rests with dose limits, exposure times, and PO 2 levels above which the risk of toxicity becomes unacceptable. In addition, controlling certain “environmental” factors can reduce the risk. For specific information on how to monitor and manage oxygen exposures see Chapter 3. 16.3 DIVING WITH SPECIAL GAS MIXES This section deals with the methods for using mixed gases operationally, with special attention to decompres- sion. Mixed-Gas and Oxygen Diving 16-3 TABLE 16.1 Decompression Comparison Heliox Trimix 21% O 2 79% HE 21% O 2 50% HE 29% N 2 Depth fsw Minutes Depth fsw Minutes 200 80 70 60 50 40 30 20 10 30 3 5 6 10 17 30 61 139 305 271 200 70 60 50 40 30 20 10 30 2 3 6 10 16 30 68 169 135 Decompression Stops Decompression Stops Total Runtime Decompression Time 16-4 NOAA Diving Manual FIGURE 16.1 Effect of Oxygen with Various Pressures and Mixtures Depth-Feet of Seawater and Meters of Seawater

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