By Professor Dr. med Albert A. Bühlmann (auth.)
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03. With this mixture of gases it is possible to work 4-5 h daily at 18-20m; the subsequent decompression with pure oxygen requires only 20min. At greater depths the working time is reduced, and for shorter working times a higher inspiratory partial pressure of oxygen is tolerated. For work at greater depths it is advantageous to have two periods of work daily with an interval between them of 42 Abnormal Atmosphere 3-4 at normal pressure. Table 23 in Appendix A gives information concerning the possibilities of daily periods of work in a range of 7-45 m depth when mixtures of nitrogen and oxygen are breathed.
16-18 the reduction in the ambient pressure after the interval corresponded to the coefficients of the ZH-L12 system. In these experiments no symptoms of inadequate decompression occurred. These results confirm the utilizability of the decompression method based on a linear relation between the tolerated overpressure of the inert gas in tissue and the ambient pressure, also above sea level (see Fig. 9). 2 by the half-value time 397-635 min. 0 bar confirms these results. The tolerance of the slow tissues to an overpressure of helium is significantly greater than to an overpressure of nitrogen (Sect.
The exposures with helium as the inert gas yielded an increased tolerance that was dependent upon the fraction of nitrogen; the various proportions of nitrogen make it possible to calculate the tolerated pressure of helium. 6). t. -8A -Sat - · - - - - - . / " ...... / PHe = (PN2 • 1,25) + PHe He 1/2t 100 150 200 250 min N2 1ht 265 397 529 661 min Fig. 6. 0 bar. 67 bar, pains in the joints may arise. 30 bar, corresponding to the lengthy exposures to air in experiments A0-320 and AA-320. 3 bar of nitrogen (see Sect.