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* Repetitive dives are not authorized for dives below the Limit Line. CHAPTER 17 Closed-Circuit Mixed-Gas UBA Diving 17-45 * Repetitive dives are not authorized for dives below the Limit Line. CHAPTER 17 Closed-Circuit Mixed-Gas UBA Diving 17-45 Decompression Stops (fsw) Stop Times (min) Bottom Time to Depth Time First Stop (fsw) (min.) (min sec) Bottom Time to Depth Time First Stop (fsw) (min.) (min sec)

Water Entry And Descent

The maximum descent rate is 60 feet per minute. During descent, the UBA will automatically compensate for increased water pressure and provide an adequate volume of gas for breathing. During descent the oxygen partial pressure may increase as oxygen is added to the breathing mixture as a portion of the diluent. Depending on rate and depth of descent, the primary display on the MK 16 UBA may illuminate flashing green. It may take from 2 to 15 minutes to consume the additional oxygen added by the...

Scuba Bottle Floodable Volume

FV Cylinder Floodable Volume in cubic feet N Number of cylinders PI Initial pressure in psig PR Reserve pressure in psig Example A set of twin 80-cubic foot scuba cylinders is charged to 2,800 psig. The floodable volume of one cylinder is 0.399 cubic foot. After equalization, a reserve pressure of 250 psig is assumed. CDC . 0.399 x 2 x (2, 800- 250) EBS volume available - -- The following floodable volume numbers are provided for reference The volume of gas available in the EBS II may be...

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...

Diluent Bottle Primary Battery

Recirculating Pressure C3500d Army

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...