Fleet Modernized Double Lock Recompression Chamber

Outer Lock Inner Lock

1. Inner Lock

2. Outer Lock

3. Gas Supply - Inner Lock

4. Gas Supply - Outer Lock

5. Gas Exhaust

6. O2 Analyzer

7. CO2 Analyzer

8. Inner-Lock Depth Gauges (2)

9. Outer-Lock Depth Gauges (2)

10. Communications Panel

11. Sound-Powered Phone

12. Pipe Light Control Panel

13. Ground Fault Interrupter

15. Flowmeter

16. Stopwatch/Timer

17. Telethermometer

18. CO2 Scrubber

19. Fire Extinguisher

20. Chiller/Conditioner Unit

21. Gag Valve

22. Relief Valve - 110 psig

23. BIBS Overboard Dump Regulator - Outer Lock

Figure 22-4. Fleet Modernized Double-Lock Recompression Chamber. CHAPTER 22 — Recompression Chamber Operation

22-2.1.1 Chamber Volume. Navy chambers rated at the same pressure do not all have the same physical dimensions, with the exception of the aluminum chambers, ARS 50 class chambers, TRCS, and FARCC. Consequently, internal volumes of steel chambers are not standard and must be calculated for each chamber. Chamber volume is normally provided with the chamber.

The basic components of a recompression chamber are much the same from one model to another. They must be able to impose and maintain a pressure equivalent to a depth of 165 fsw (6 atmospheres absolute). The piping and valving on some chambers is arranged to permit control of the air supply and the exhaust from either the inside or the outside of the chamber. Controls on the outside must be able to override the inside controls in the event of a problem inside the chamber.

The usual method for providing this dual-control capability is through the use of two separate systems. The first, consisting of a supply line and an exhaust line, can only be controlled by valves that are outside of the chamber. The second air supply/exhaust system has a double set of valves, one inside and one outside the chamber. This arrangement permits the tender to regulate descent or ascent from within the chamber, but always subject to final control by outside personnel.

22-2.2 Modernized Chamber. Modernized chambers (Figure 22-4) have carbon dioxide and oxygen monitors, a CO2 scrubber system, a Built-In Breathing System (BIBS), and an oxygen dump system which together reduce the ventilation requirements. These chambers also include a chamber environment control system that regulates humidity and temperature.

22-2.3 Transportable Recompression Chamber System (TRCS). In addition to the chambers described above, a Transportable Recompression Chamber System (TRCS) is currently in fleet use (Figure 22-5). The TRCS consists of two pressure chambers. One is a conical-shaped chamber (Figure 22-6) called the Transportable Recompression Chamber, and the other is a cylindrical shaped vessel (Figure 22-7) called the Transfer Lock (TL). The two chambers are capable of being connected by means of a freely rotating NATO female flange coupling.

When a recompression chamber is required on site per Figure 6-14, or surface decompression dives are planned, the full TRCS system (including both TRC and TL) shall be on site.

When a recompression chamber is not required on site per Figure 6-14, the inner lock (TRC) may be used for emergency recompression treatment.

22-2.4 Fly Away Recompression Chamber (FARCC). This chamber system consists of a 60-inch double lock modernized chamber in a 20' x 8' x 8' milvan (Figure 22-8 and Figure 22-9). The Fly Away Recompression Chamber (FARCC) also includes a life support skid (Figure 22-10). In addition, a stand-alone generator is provided for remote site power requirements.

Carbon Dioxide Scrubber Design
Figure 22-5. Transportable Recompression Chamber System (TRCS).
Navy Trcs Dive Chamber

Design Pressure 110 psig

Design Temperature 0-125°F Length 95.7"

Height

Width

Weight

Internal Volume Door Opening View Ports Medical Lock Mating Flange Life Support Scrubber

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