Surfacesupplied Heliumoxygen Descent And Ascent Procedures 142

14-3.1 Surface-Supplied Helium-Oxygen Decompression Table 14-3

14-3.1.1 Calculating Maximum Depth 14-3

14-3.1.2 Travel Rates 14-4

14-3.1.3 Decompression Breathing Gas 14-4

14-3.2 Special Procedures for Descent with Less than 16 percent Oxygen 14-4

14-3.2.1 Descent Procedure 14-4

14-3.2.2 Aborting the Dive 14-4

14-3.3 Procedures for Shifting to 60 Percent Helium/40 Percent Oxygen at 100 fsw. . . . 14-5

14-3.4 Procedures for Shifting to 100 Percent Oxygen at the First Oxygen Stop 14-5

14-3.5 Ascent from the 40-fsw Water Stop 14-5

14-3.6 Surface Decompression Procedures (SUR D) 14-5

14-3.7 Normal SUR D Procedures Using Oxygen 14-8

14-3.7.1 Initiating Normal Surface Decompression 14-8

14-3.8 Emergency SUR D Procedures Using Oxygen 14-11

14-3.9 Aborted Dive During Descent 14-11

14-3.9.1 Dive Aborted at 200 fsw or Shallower 14-11

14-3.9.2 Dive Aborted Deeper than 200 fsw 14-11

14-3.9.3 No-Decompression Limits 14-11

14-3.10 Variation in Rate of Ascent 14-14

14-3.10.1 Early Arrival at the First Stop 14-14

14-3.10.2 Delays in Arriving at the First Stop 14-14

14-3.10.3 Delays in Leaving a Stop 14-15

14-3.10.4 Delays in Travel from 40 fsw to the Surface 14-15

14-3.11 Special Procedures for Diving with an Oxygen Partial Pressure Greater

Than 1.3 ata 14-15

14-3.11.1 Calculating Oxygen Partial Pressure 14-15

14-3.11.2 Gas Mixtures 14-17

Chap/Para Page 14-3.11.3 Charting Surface-Supplied Helium-Oxygen Dives 14-17

14-4 SURFACE-SUPPLIED HELIUM-OXYGEN EMERGENCY PROCEDURES 14-17

14-4.1 Bottom Time in Excess of the Table 14-17

14-4.2 Loss of Helium-Oxygen Supply on the Bottom 14-17

14-4.3 Inability to Shift to 40 Percent Oxygen at 100 fsw During Decompression 14-19

14-4.4 Loss of Oxygen Supply at 50 fsw 14-19

14-4.4.1 Unable to Shift to 60/40 14-19

14-4.4.2 Surface Decompression from the Emegency Procedures

Decompression Table 14-20

14-4.5 Loss of Oxygen Supply at the 40-fsw Stop 14-20

14-4.5.1 Oxygen Lost before Diver is within Emergency SUR D Limits 14-20

14-4.5.2 Diver is within Emergency SUR D Limits 14-20

14-4.5.3 Diver is within Normal SUR D Limits 14-20

14-4.5.4 Diver is in the Chamber 14-20

14-4.6 Oxygen Supply Contaminated with Helium-Oxygen 14-21

14-4.7 Central Nervous System (CNS) Oxygen Toxicity Symptoms (Nonconvulsive)

at the 50-fsw Stop 14-21

14-4.8 CNS Oxygen Toxicity Symptoms (Nonconvulsive) at the 40-fsw Stop 14-22

14-4.8.1 Diver is not within Emergency Surface Decompression Limits 14-22

14-4.8.2 Diver is within Emergency Surface Decompression Limits 14-22

14-4.8.3 Diver is within Normal Surface Decompression Limits 14-22

14-4.8.4 Diver is at a Chamber Stop 14-22

14-4.9 CNS Oxygen Convulsion at the 50-fsw Stop or 40-fsw Stop 14-22

14-4.10 Omitted Decompression 14-23

14-4.10.1 Blowup from a Depth Greater Than 50 fsw 14-23

14-4.10.2 For Saturation Systems 14-24

14-4.10.3 For Nonsaturation Systems 14-24

14-4.11 Light-Headed or Dizzy Diver on the Bottom 14-26

14-4.11.1 Initial Treatment 14-26

14-4.11.2 Vertigo 14-26

14-4.12 Unconscious Diver on the Bottom 14-26

14-4.13 Decompression Sickness in the Water 14-28

14-4.13.1 Management 14-28

14-4.13.2 Deeper than 50 fsw 14-28

14-4.13.3 At 50 fsw and Shallower 14-28

14-4.13.4 Resolution/Nonresolution 14-28

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