EX 19 Performance Testing at 850 and 450 FSW (Feet of Seawater)
NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL
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The EX 19 is a self-contained closed-circuit underwater breathing apparatus UBA capable of controlling the partial pressure of oxygen PO2 at a specified level. The Naval Coastal System Center prototype underwent manned evaluations in February 1988 and was accepted for continued development. In addition, it was found that the overall design could be adapted to an expanded mission requirement. This potential retains the perspective that was outlined in the operational requirement for the Conventional Dive system in which the EX 19 is the designated UBA. Reference 1 contains a complete description of the NCSC EX 19. The initial study performed on the prototype design was at a depth of 150 feet of seawater FSW using a PO sub 2 of 0.7 ATA in nitrogen. The divers reported low dyspnea scores and had no difficulty performing their work cycles. When evaluating performance with respect to gas density, the 150 FSW study is more difficult for the diver when compared to a 1000 FSW dive using HEO sub 2. It was concluded that the EX 19 had an overall breathing resistance that would support a working diver at a deeper depth. The purpose of this study was to perform a manned evaluation of the advanced design model ADM of the EX 19. Due to the engineering constraints of the ADM, the maximum test depth was 850 FSW. The EX 19 was also tested at 450 FSW.
- Stress Physiology
- Marine Engineering