Unconsciousness

The term chemical injury refers to the introduction of a caustic solution from the carbon dioxide scrubber of the UBA into the upper airway of a diver. 17-11.4.1 Causes of Chemical Injury. A caustic alkaline solution results when water leaking into the canister comes in contact with the carbon dioxide absorbent. When the diver is in a horizontal or head down position, this solution may travel through the inhalation hose and irritate or injure the upper airway. 17-11.4.2...

Operational Planning

Because the MK 16 UBA maintains a constant partial pressure of oxygen and only adds oxygen or diluent gas as needed, dives of long duration are possible. Mission capabilities, dive procedures, and decompression procedures are radically different from any other methods. This requires a high level of diver training and awareness and necessitates careful dive planning. Chapter 6 provides general guidelines for operational planning. The information provided in this section is supplemental to the MK...

Diluent Bottle Primary Battery

MK 16 MOD 0 UBA Functional Block Diagram. 17-2.1 Recirculation and Carbon Dioxide Removal. The diver's breathing medium is recirculated in a closed-circuit UBA to remove carbon dioxide and permit reuse of the inert diluent and unused oxygen in the mixture. The basic recirculation system consists of a closed loop that incorporates inhalation and exhalation hoses and associated check valves, a mouthpiece or full face mask FFM , a carbon dioxide removal unit, and a diaphram assembly....

The MK 16 UBA provides no visual warning of excess CO2 problems The diver should be aware of CO2 toxicity symptoms

Gas Addition, Exhaust, and Monitoring. In addition to the danger of carbon dioxide toxicity, the closed-circuit UBA diver encounters the potential hazards of hypoxia and central nervous system CNS oxygen toxicity see Volume 5 . It is essential that these hazards be avoided. The UBA must control the partial pressure of oxygen ppO2 in the breathing medium within narrow limits for safe operation and be monitored frequently by the diver. Hypoxia can occur when there is insufficient oxygen in the...