Diving For Science 2005 Proceedings Of The American

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Diving For Science 2005 Proceedings Of The American Academy Of Underwater Sciences Table 2: Summary of CSCR 190 Scrubber Test Results Radial Flow Canister RMV, lpm= 40 CO2 Injection rate, slpm= 1.35 Water temperature, F= 40 Duration, min Depth, FSW UBA mode Absorbent Type Weight, lbs 0.5% SLE 1.0% SLE 25 Closed 8-12 Sofnolime 5.16 197.1 227 66 Semi-Closed 8-12 Sofnolime 5.16 153.5 176.7 25 Closed 4-8 Sofnolime 5.08 132 166 66 Semi-Closed 4-8 Sofnolime 4.98 67.5 101 Axial Flow Canister RMV, lpm= 40 CO2 Injection rate, slpm= 1.35 Water temperature, F= 40 Duration, min Depth, FSW UBA mode Absorbent Type Weight, lbs 0.5% SLE 1.0% SLE 25 Closed 8-12 Sofnolime 6.72 248 272 66 Semi-Closed 8-12 Sofnolime 6.75 234.8 254.3 25 Closed 4-8 Sofnolime 6.5 208 243.5 66 Semi-Closed 4-8 Sofnolime 6.52 163.5 193.5 Duration, min 300 250 200 150 100 50 0 Canister Durations To Reach 1% SLE 8-12 Sofnolime Absorbent 25 66 Depth, FSW 40 Radial Flow Canister Axial Flow Canister Figure 8: Comparison to canister durations for axial and radial flow scrubbers tested with the CSCR 190.
Conclusions Diving For Science 2005 Proceedings Of The American Academy Of Underwater Sciences The CSCR 190 has been shown to meet operational requirements for shallow water, pure oxygen diving missions currently satisfied by the U.S. Navy MK 25 Closed Circuit Breathing Apparatus, with the added capability of being switched to semi-closed, mixed-gas operations to make excursions to depths up to 190 FSW. Its simple, mechanically-controlled gas injection system is respiratory-coupled to minimize the effects of variations in diver activity on circuit oxygen levels. Additionally, a shallow water injection system provides safe circuit oxygen levels even when the rig is operated in the semi-closed mode near the surface. In effect, this new UBA design crosses over between the capabilities of the U.S Navy MK 25 (closed-circuit, pure oxygen) and the U.S. Navy MK 16 (closed circuit, electronicallycontrolled mixed gas) while satisfying the following ♦ depth capability beyond that of the MK 25 ♦ reduced complexity, cost, and maintenance as compared to the MK 16 ♦ expanded versatility to satisfy multiple missions ♦ predictable circuit oxygen levels over the full range of diver activities (unlike conventional semi-closed rebreathers) resulting in increased safety Conceivably, the CSCR 190 could approach a fixed oxygen partial pressure, simulating electronically controlled rigs, by reducing the exhaust volume ratio as the diver depth increases. This reduction in the EVR could potentially be achieved mechanically using a piston/cylinder design to reduce the volume of the exhaust bellows as depth increases. This would reduce the injection rate of makeup gas as the diver descends, resulting in a reduction in the circuit oxygen level rise with depth. Acknowledgments This research was made possible through funding from Dr. Thomas Swean, Jr., Team Leader of the Ocean Engineering and Marine Systems Science and Technology Program, Office of Naval Research, ONR Code 321OE. Literature cited Carson, D., 1998. Rebreather Revolution: The Secret to Longer, Quieter Dives. Scuba Times, July/August, pp12-14. Clarke, J.R., D.L. Junker and S.C. Allain, April 1996. Evaluation of the U.S. Divers DC 55 Semi-Closed Underwater Breathing Apparatus. Report No. 5-96, Navy Experimental Diving Unit, Panama City, Florida. Clarke, J.R., M.E. Knafelc, D.L. Junker and S.C. Allain, 1996. Evaluation of the Draeger Extreme Semi-Closed Underwater Breathing Apparatus. Report No. 7-96, Navy Experimental Diving Unit, Panama City, Florida. 41
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Discussion Diving For Science 2005
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Patterns of Mixed-Species Foraging
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Group Size 3 2 Diving For Science 2
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Predatory Behavior of Piscivorous R
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NOAA’s Diving Accident Management
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The Risk of Decompression Sickness
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Reciprocities Diving For Science 20
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University of South Florida College
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Community Science - Recruiting, Tra
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Diving in two Marine Lakes in Croat
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Scientific Diving Techniques Applie
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Diving for Science: Teaching Divers
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Scientific Diving and ROV Technique
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The Southern California Regional Ke
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