An Auxiliary Gas Supply to Improve Safety During Aborted Dives with the Canadian Underwater Mine Countermeasures Apparatus (CUMA)

Un système auxiliaire d’approvisionnement en gaz augmente la sécurité des plongeurs utilisant l’appareil canadien de déminage sous-marin (ACDSM) lors des remontées d'urgence

Authors
  1. Nishi, R.Y.
  2. Eaton, D.J.
  3. Ward, A.J.
  4. Woodward, D.J.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
The Canadian Underwater Minecountermeasures (MCM) Apparatus (CUMA) was introduced into CF service in 1991 and is widely used by other Navies under the commercial name of SIVA+. Despite its success, both within the CF and abroad it is now apparent that emergency procedures were not fully researched at the time of its introduction. Subsequent research into Severe Decompression Accidents (SDA) has shown that previous emergency procedures were not sufficient to safely decompress a diver during an emergency ascent from deep or long, shallow dives. As a result of this, other decompression procedures have been instituted, based on research and practices adopted from other nations. Another option is to give the diver the option of decompressing safely in the water. This will be done using a completely independent and alternative breathing system known as the Auxiliary Gas Supply (AGS) in case of complete diving set failure. The AGS will allow the diver to decompress using existing operational tables rather than extended emergency tables. The AGS will deliver a 40% Oxygen and 60% Nitrogen mix, which will facilitate Helium off-gassing following the same proven principal used in CF Surface Supply diving.

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Keywords
Breathing apparatus failure;emergency ascent;decompression;Doppler bubble detection
Report Number
DRDC-TORONTO-TR-2010-081 — Technical Report
Date of publication
01 Nov 2010
Number of Pages
70
DSTKIM No
CA035934
CANDIS No
535717
Format(s):
Electronic Document(PDF)

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