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Support service for the 480 m heliox simulated saturation -493 m excursion dive

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Author:
No author available
Journal Title:
Chinese Journal of Nautical Medicine and Hyperbaric Medicine
Issue:
6
DOI:
10.3760/cma.j.issn.1009-6906.2011.06.002
Key Word:
饱和潜水;巡回潜水;设备保障;Saturation diving;Excursion diving;Support service

Abstract: Objective To check and test the simulated saturation diving facility for the successful implementation of the 480 m heliox simulated saturation-493 m excursion dive.Methods Four divers performed the deep saturation-excursion dive in our laboratory by using the 500 m Simulated Saturation Diving System and KMB 18(B) diving apparatus.The mission of the support service was to repair and test the diving system before the experiment and to get it ready for the dive.During the experiment,our mission as specified in the support service protocol,was to control the chamber pressure,the partial pressures of oxygen and carbon dioxide,the temperature and humidity,to enable the divers to complete excursion dives,to help them in their daily life,and to ensure that they would come to the surface in a safe and timely manner.Results After 82hours of compression,the divers reached the simulated saturation depth of 480 m and stayed at this pressure for 49.6 h.The maximum excursion depth the divers reached was 493 m.The duration for decompression was 302.4 h and total time for hyperbaric exposure was 434 h.During the process of compression and stay at the saturation depth,the O2 partial pressure was kept between 35 kPa and 45 kPa; and during decompression,the O2 partial pressure was maintained between 48 kPa and 52 kPa.When they were decompressed to a pressure of 12 m,the O2 partial pressure was kept at 21% -23%.The CO2 partial pressure was constantly kept within the limit of 0.5 kPa.Relative humidity was maintained between 60% and 80% and temperature in the living chamber was kept between 29 ℃ and 32 ℃.Conclusions The divers showed good physical fitness when they came out of the saturation chamber,and felt that the chamber environment was quite comfortable.The result of the support service coincided with what the protocol had expected,indicating that the protocol was a complete succcess.

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