US NAVY DIVE MANUAL CHAPTER 13 MIXED GAS OPERATIONAL PLANNING

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US NAVY DIVE MANUAL CHAPTER 13 MIXED GAS OPERATIONAL PLANNING
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2015-08-11 02:34:04
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US NAVY DIVE MANUAL CHAPTER 13 MIXED GAS OPERATIONAL PLANNING
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US NAVY DIVE MANUAL CHAPTER 13 MIXED GAS OPERATIONAL PLANNING
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  1. 13-1.5
    Medical Considerations
    • Typical medical problems in mixed gas and oxygen diving include decompression sickness, oxygen toxicity, thermal stress, and carbon dioxide retention.
    • Deep saturation diving presents additional concerns, including high pressure nervous syndrome (HPNS), dyspnea, compression arthralgia, skin infections, and performance decrements
  2. Table 13‑1. 
    Average Breathing Gas Consumption Rates.
    • Normal: 1.4 ACFM
    • Max: 6.0 ACFM (free flow)
  3. 13-3.1
    Mixed Gas Diving Methods.
    • The three types of mixed gas diving equipment are:
    • Surface supplied gear (MK 21 MOD 1, EXO BR MS, KM­37 NS) 
    • Semiclosed circuit and closed circuit UBAs 
    • Saturation deep dive systems
  4. 13-3.1
    Helium­-oxygen diving methods should be employed
    • For deep dives (190-­300 fsw) of short duration
    • For shallower dives where nitrogen narcosis reduces mental acuity and physical dexterity,
  5. 13-3.1
    Saturation diving is the preferred method for dives:
    • Deeper than 300 fsw
    • Shallow dives where extensive in­water times are required
  6. 13-3.2
    In mixed gas diving, the principle factors influencing the choice of a particular method are:
    • Depth and planned duration of the dive
    • Equipment availability
    • Quantities of gas mixtures available
    • Qualifications and number of personnel available
    • Type of work and degree of mobility required
    • Environmental considerations such as temperature, visibility, type of bottom, current, and pollution levels
    • Communication requirements
    • Need for special operations procedures
  7. Table 13‑2. 
    Equipment Operational Characteristics.
    • Normal working limits: 300FSW*
    • Maximum working limits: 380FSW*
    • Chamber requirements: Level I
    • Minimum personnel: 12

    *Depth limits are based on considerations of working time, decompression obligation, oxygen tolerance and nitrogen narcosis
  8. 13-3.5
    Environment, exposure to adverse environmental conditions prior to diving
    • Subjective thermal comfort does not accurately indicate adequate rewarming.
    • Complete rewarming of the diver has taken place, as shown by sweating, normal pulse, and return of normal core temperature
  9. 13-4.2
    Personnel Requirements, minimum stations shall be manned by formally trained (NDSTC) mixed gas divers:
    • Diving Officer
    • Master Diver
    • Diving Supervisor
  10. 13-4.3
    Diver Fatigue, rest requirements:
    All divers making mixed gas dives must have at least 8 hours of sleep within the last 24 hours before diving
  11. Table 13‑4.
    The following stations shall be manned by formally trained (NDSTC) surface supplied divers
    • Diver 
    • Standby Diver 
    • Rack Operator 
    • Console Operator 
    • Timekeeper/Recorder
  12. Table 13-4.
    When circumstances require the use of a non-diver, ensure that the personnel has been thoroughly instructed. These stations include:
    • Tender 
    • Standby Tender 
    • Winch Operator
  13. 13-8.2
    Operational Considerations:
    • 1. Adequate mixed gas supply
    • 2. Master Diver required on dive station for mixed gas operations
    • 3. Diving Medical Officer required on dive station for all exceptional exposure dives and dives exceeding the equipment normal working limits
    • 4. Recompression chamber required on dive station
    • 5. Planned exceptional exposure dives or dives exceeding normal working limits require CNO approval
    • 6. Breathing gas heater
    • 7. Hot water suit

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