Computation of the Helium-oxygen Decompression Tables
U.S. Navy Experimental Diving Unit, U.S. Naval Gun Factory, 1950 - Deep diving - 25 pages
The tables are computed to the nearest foot - less than 0.5 is dropped, 0.5 or more is considered an additional foot. When computing the time of the final stop, any fraction of a minute is considered an additional minute. At stops other than the final stops, the saturation loss of the controlling tissue governs. Whether or not to consider a fraction of a minute must be determined by inspection. This last step is necessary because tissue loss is rounded off to the nearest foot.
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02 Eff PRESSURE 16 percent oxygen 20 minute 20 percent inert 20 tissue 33 feet 50 foot stop 70 minute tissues 80 FEET 80 percent oxygen 90 foot absolute depth additional minute ascent as given ascent from bottom AV PP DIFF Average PP Average PP exerted bottom bottom 310 PP breathing medium CHANGE FINAL PP COL 6 Product COL 7 Sum computed COMPUTING THE HELIUM-OXYGEN considered Controlling Tissue decompression schedule Decompression Stops derived from Table determine the percentage determined by inspection diver during diver must remain Eff PRESSURE enter Table II explanation of Table Factor of Saturation Feet per minute FINAL PP 20 final stops foot stop formula Function G. G. MOLUMPHY Gases except Oxygen gauge given Partial Pressure h 5 TISSUE He02 MIXTURE HELIUM-OXYGEN DECOMPRESSION TABLES HELIUM-OXYGEN DIVING Helium-Oxygen mixture Helium-Oxygen mixture composed II A PERCENTAGE including UlO feet Increase Saturation Effect inert gases inspection from Table INTERPOLATE Interval Interval Tissue K THE SIXTH loss is assumed maximum depth maximum depth possible minute tissue controls minute tissue line minute work dive mixture composed nearest foot oxygen content oxygen percentage PARTIAL PRESSURE 02 Partial Pressure Decompression Partial Pressure Increase partial pressure table percent helium percent inert gas percent oxygen loss Percentage Factor PERCENTAGE OF He02 percentage of oxygen Percentage Saturation PP AOG PP at bottom PP AV PP PP CHANGE FINAL PP DIFF PP PP exerted PP of AOG PP STOP PP pression Table PRESSURE 02 PERCENTAGE Pressure Decompression Table Pressure Increase Saturation Product of columns Rate of Ascent ratio recompression chamber safety factor SAT PP CHANGE Saturation or Desaturation second stop Second Trial Section sequent stop Shift to Oxygen Spent at Decompression STOP PP DIFF Sum of columns Surface Decompression Surface Decompression Procedure Surface the diver Table IV Column tabulated THIRD STOP THIRD TRIAL tissue controls TISSUE PP AV TISSUE PP STOP tissue saturation Tissue Time Units tissues upon leaving total PP Trial First Stop U.S. Navy UO feet UO foot ventilate 25 cubic without exceeding