Surfacesupplied Heliumoxygen Emergency Procedures

In surface-supplied mixed-gas diving, specific procedures are used in emergency situations. The following paragraphs detail these procedures. Other medical/physiological factors that surface-supplied mixed-gas divers need to consider are covered in detail in Volume 5. The U.S. Navy Treatment Tables are also presented in Volume 5.

14-4.1 Bottom Time in Excess of the Table. In the rare instance of diver entrapment or umbilical fouling, bottom times may exceed 120 minutes, the longest value shown in the table. When it is foreseen that bottom time will exceed 120 minutes, immediately contact the Navy Experimental Diving Unit for advice on which decompression procedure to follow. If advice cannot be obtained in time:

1. Decompress the diver using the 120-minute schedule for the deepest depth attained.

2. Surface the diver after completing 30 minutes on oxygen at 40 fsw.

3. Quickly recompress the diver to 60 fsw in the chamber.

4. Treat the diver on Treatment Table 6 (Figure 21-8).

14-4.2 Loss of Helium-Oxygen Supply on the Bottom. Follow this procedure if the umbilical helium-oxygen supply is lost on the bottom:

1. Shift the diver to the emergency gas system (EGS).

2. Unless the loss is momentary, abort the dive.

Date:

PPO :

Bottom Mix:

Diver 1 :

Rig:

PSIG:

O %

Left Surface:

Diver 2:

Rig:

PSIG:

O %

Left Surface:

Diver 3:

Rig:

PSIG:

0%

Table/Sched:

Left Bottom: Total Bottom Time:

Reached Surface: Reached Surface:

Total Decompression Time:

Total Time of Dive:

Diving Supervisor (print):

Diving Supervisor (signature):

Descent Rate (75 fpm max)

Emergency Decompression Table

Ascent Rate (30 fpm)

Stop Depth (fsw)

Decompression Time

Time

Water

Chamber

Water

Chamber

0 0

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