Us Navy Dive Manual Chapter 21 Rev 6 Change A

Front 1

Define a Level I Chamber

Back 1

A U.S. Navy certified recompression chamber close
enough to the dive site to support surface decompression with a surface interval of 5 minutes.
Commanding Officer may authorize a 7 min SI

Front 2

Level II

Back 2

A U.S. Navy certified recompression chamber accessible within one hour of the casualty.

Front 3

Level III

Back 3

A U.S. Navy certified recompression chamber accessible within six hours of the casualty

Front 4

May a non-Navy certified chamber be used to fulfill Level I-III requirements?

Back 4

Level I/II: A non-Navy chamber may be used to satisfy this requirement if approved in writing by the CNO.
Level III: A non-Navy chamber may be used to satisfy this requirement if approved in writing by the Commanding Officer.

Front 5

During extreme circumstances when a chamber cannot be reached within 6 hours the _________________ can give authorization to use the nearest approved recompression facility.

Back 5

Commanding Officer

Front 6

Most chamber-equipped U.S. Navy units will have one of seven commonly provided chambers. What are they?

Back 6

1. Double-lock, 200-psig, 425-cubic-foot steel chamber
2. Recompression Chamber Facility: RCF 6500
3. Recompression Chamber Facility: RCF 5000
4. Double-lock, 100-psig, 202-cubic-foot steel chamber (ARS 50 class and Modernized)
5. Standard Navy Double Lock Recompression Chamber System (SNDLRCS)
6. Transportable Recompression Chamber System (TRCS)
7. Fly-Away Recompression Chamber (FARCC)

Front 7

Does the Emergency Evacuation Hyperbaric Stretcher (EEHS) qualify as a recompression chamber? What is it used for?

Back 7

The EEHS has a single lock and allows a
patient to be administered oxygen at 60 feet while in transport to a recompression chamber. However, it does not provide hands-on access to the patient and therefore does not qualify as a recompression chamber.

Front 8

All chambers should be certified to what depth?

Back 8

165 fsw

Front 9

True or False: When a level I chamber is required or when surface decompression dives are planned, the full TRCS system shall be included.

Back 9

True

Front 10

True or False: When a level I recompression chamber is not required on site, the TRC may be used to satisfy LVL II/III requirements.

Back 10

True

Front 11

What are the rules for chamber ventilation while breathing air when no monitoring devices are in use?

Back 11

1. When air is breathed, provide 2 cubic feet per minute (acfm) for each diver at rest and 4 cubic feet per minute (acfm) for each diver who is not at rest (i.e., a tender actively taking care of a patient).

2. If ventilation must be interrupted for any reason, the time should not exceed 5 minutes in any 30-minute period. When ventilation is resumed, twice the volume of ventilation should be used for the time of interruption and then the basic ventilation rate should be used again.

Front 12

What are the rules for chamber ventilation while breathing oxygen when portable or installed oxygen and carbon dioxide monitoring systems are not available?

Back 12

1. When oxygen is breathed from the built-in breathing system (BIBS), provide 12.5 acfm for a diver at rest and 25 acfm for a diver who is not at rest. When these ventilation rates are used, no additional ventilation is required for personnel breathing air. These ventilation rates apply only to the number of people breathing oxygen and are used only when no BIBS dump system is installed.

2. If ventilation must be interrupted for any reason, the time should not exceed 5 minutes in any 30-minute period. When ventilation is resumed, twice the volume of ventilation should be used for the time of interruption and then the basic ventilation rate should be used again.

3. If a BIBS dump system or a closed circuit BIBS is used for oxygen breathing, the ventilation rate for air breathing may be used.

Front 13

What are the rules for ventilation if portable or installed oxygen and carbon dioxide monitoring systems are available?

Back 13

Ventilation may be adjusted to maintain the oxygen level below 25 percent by volume and the carbon dioxide level below 1.5 percent surface equivalent (sev).

Front 14

How often shall recompression chambers be pressure tested?

Back 14

When initially installed, at 2-year intervals thereafter, and after a major overhaul or repair.

Front 15

What does a diver candidate pressure test consist of?

Back 15

The candidates and the tender enter the recompression chamber and are pressurized to 60 fsw on air, at a rate of 75 fpm or less as tolerated by the occupants. Stay at 60 fsw for at least 10 minutes and ascend to the surface following standard air decompression procedures.

Front 16

How long must all pressure test candidates remain at the immediate chamber site for?

Back 16

A minimum of 15 minutes and at the test facility for 1 hour.

Front 17

In regards to sound powered phones in the chamber, what can be done to the phone inside of the chamber to keep and "open circuit" for the supervisor?

Back 17

Tape down the button.

Front 18

True or false: Emergency lights for both locks and the external control station are required.

Back 18

True

Front 19

What is the air requirements for use in regards to recompression chamber operations? What is the minimum TT that this requirement satisfies?

Back 19

TT-6A. Have sufficient air to press the IL once and the OL twice to 165' and ventilate the chamber for the provided category requirement.

Front 20

What must be done in regards to Sur 'D' when calculating the minimum air requirement for the recompression chamber.

Back 20

Must add the required air for Sur 'D' to the minimum air required.

Front 21

Does a closed circuit BIBS mask with a CO2 scrubber satisfy the requirements for "BIBS overboard dump"?

Back 21

Yes

Front 22

How often shall a recompression chamber be inspected and cleaned?

Back 22

Every year or at the activities discretion.

Front 23

What is the greatest single hazard in the use of a recompression chamber?

Back 23

Explosive fire.

Front 24

What clothing shall be worn inside of the chamber?

Back 24

100% cotton or 65%polyester/35%cotton for diver swim trunks.

Front 25

If use of lubricants is required, where can you find the guidance for approved lubricants and their use?

Back 25

NSTM 262

Front 26

What does the diver candidate pressure test consist of?

Back 26

Press to 60' @ 75fpm or less, as tolerated.
Stay @ 60' for a minimum of :10
Stay in immediate area of chamber for :15 once surfacing, and at the test facility for 1 hour.