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16 Cards in this Set
- Front
- Back
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What are the average breathging gas consumption rates for MK-21 MOD 1, EXO BR MS and the KM-37, normal and heavy work?
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-1.4 acfm (demand/normal)
-6 acfm (free flow/heavy) |
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What are the three types of mixed gas diving equipment?
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1. Surface supplied gear (MK 21 MOD 1, EXO BR MS, KM-37)
2. Semiclosed circuit and closed circuit UBAs 3. Saturation deep dive systems |
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When should helium-oxygen diving methods be employed?
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For deep dives (190-300 fsw) of short duration, or for shallower dives where nitrogen narcosis reduces mental acuity and physical dexterity
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When is saturation diving is the preferred method?
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For dives deeper than 300 fsw or for shallow dives where extensive in-water times are required (as shallow as 150')
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What is the normal and maximum working depths for MK 21 MOD 1, KM-37, and EXO BR MS using Mixed Gas?
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Normal – 300 fsw, Maximum – 380 fsw with CNO permission
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What is the chamber requirement when performing surface supplied mixed gas diving operations?
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Level I- Reuired to be accessible within 5 minutes, may be extended to 7 minutes by Commanding Officer.
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What is the minimum dive station manning levels for mixed gas diving? List positions
-One diver -Two Divers |
12 for 1 diver. 15 for 2, add 1 diver and 2 tenders.
-Diving officer -Standby Dvr + 1 Tndr -Diving Medical Officer -Timekeeper/recorder -Diving Supervisor/MDV -Winch Operator -Diving Medical Technician -Rack Operator -1/2Diver + 2/4 Tenders -Console Operator |
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ROVs used in support of diving operations must have what safety feature installed to protect the divers?
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Ground fault interrupter (GFI) system
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The gas capacity of the primary air system must meet what requirements?
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The consumption rate of the designated number of divers for the duration of the dive.
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The gas capacity of the secondary system must meet what requirements?
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Must be able to support recovery operations of all divers and equipment if the primary system fails. This may occur immediately prior to completing the planned bottom time at maximum depth when decompression obligations are the greatest. Emergency air supply is provided in the event all mixed gas supplies are lost.
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Which dive team members shall be manned by formally trained (NDSTC) mixed gas divers?
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1. Diving Officer
2. Master Diver 3. Diving Supervisor |
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All divers making mixed gas dives must have at least ____ hours of sleep within the last ____ hours before diving.
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8 hours of sleep within the last 24 hours
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True or False: A DMT and a Master Diver is required on station for all mixed gas dives.
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True
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Describe the FADS III Mixed Gas System (FMGS).
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A portable, self contained, surface supplied diver life support system designed to support mixed gas dive missions to 300'. The FMGS consists of five gas rack assemblies, one air supply rack assembly (ASRA), one oxygen supply rack assembly (OSRA), and three helium-oxygen supply rack assemblies (HOSRA). Each rack consists of nine 3.15 cu ft floodable volume composite flasks vertically mounted in rack assembly. The ASRA will hold 9600 scf of compressed air at 5000 psi. Compressed air is provided by a 5000 psi air compressor assembly, which includes an air purification system. Oxygen is stored at 3000 psi. The FMGS also includes a mixed gas control console assembly (MGCCA) and two gas booster assemblies for use in charging the OSRA and HOSRA. Three banks of two, three, and four flasks allow the ASRA to provide air to the divers as well as air to support chamber operations.
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List operational considerations for mixed gas diving.
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-Adequate gas supply
-MDV required on station -DMO required for exceptional exposure/exceeding rig limits. -Chamber required on station -Planned exceptional exposure/exceeding rig limits requires CNO approval -Breathing gas heater/hot water suit |
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What are the typical medial problems experienced in mixed gas diving?
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DCS, O2 tox, thermal stress, CO2 retention. Deep sat dives can present high pressure nervous syndrome, dyspnea, compression arthralgia, skin infections, and performance decrease.
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