COMPARISON OF HELIOX AND AIR AS SUIT INFLATION GASES

Authors
  1. Romet, T.T.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
It is well accepted that the primary disadvantage of helium based breathing gas also acting as the suit inflation gas is its higher thermal conductivity. Although thermal conductivity of helium is six times that of nitrogen, a helium/oxygen mixture similar to air is only four times as great. It has been further suggested that for each degree C that the ambient air is below mean skin temperature, the skin will be 0.1C lower in a HeO2 gas than air. Chamber studies have shown exposure to a helium environment results in a skin cooling, higher ambient temperatures to maintain comfort but no effect on core temperature. This study investigated the differences between HeO2 and air as a suit inflation gas during in-water dives ranging in depth from 36 to 86 msw. In the double blind study neither the divers or investigators were told which gas was provided for suit inflation. Core temperature was determined by rectal thermistor and skin heat flow by heat flux transducers. TRUNCATED
Report Number
DCIEM-92-10-P-45 — @Paper presented at the DCIEM Diver Thermal Protection Workshop, North York, Ontario, Canada, 31 Jan - 2 Feb 1989; CONTAINED IN 92-03143
Date of publication
15 Jan 1992
Number of Pages
6 (p45-50)
DSTKIM No
92-03141
CANDIS No
125611
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS

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