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Related Experiment Videos

The thermal performance of partial coverage wet suits.

J R Allan, D H Elliott, P A Hayes

    Aviation, Space, and Environmental Medicine
    |November 1, 1986
    PubMed
    Summary

    This study assessed a partial wetsuit for offshore helicopter passenger safety. While offering some insulation, water flushing beneath the suit can significantly reduce its protective effectiveness.

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    Area of Science:

    • Occupational safety
    • Thermal physiology
    • Protective clothing

    Background:

    • Offshore oil field operations pose risks to helicopter passengers during emergency evacuations.
    • Short-term immersion protection is crucial for survival in cold water environments.
    • Existing protective gear may not adequately address the specific needs of helicopter passenger immersion.

    Purpose of the Study:

    • To evaluate the effectiveness of a partial wetsuit as short-term immersion protection for offshore helicopter passengers.
    • To quantify the thermal insulation provided by the wetsuit in water.
    • To predict survival times based on insulation values and identify potential limitations.

    Main Methods:

    • Manikin measurements were used to determine the effective insulation (in togs) of the wetsuit on covered and uncovered body areas.
    • Heat flux measurements were conducted to assess water flushing beneath the suit.
    • Model predictions of survival time were generated for different body types ('thin' and 'average') at a specific water temperature.

    Main Results:

    • The wetsuit provided a mean insulation of 0.54 togs for covered areas and 0.09 togs for uncovered areas.
    • Model predictions suggest adequate protection for approximately 1 hour at 5°C, contingent on proper fitting.
    • Direct heat flux measurements revealed significant water flushing under the suit, indicating a potential loss of insulation.

    Conclusions:

    • The partial wetsuit offers limited short-term immersion protection for offshore helicopter passengers.
    • Effective fitting is critical to maximize the wetsuit's thermal insulation.
    • Water flushing beneath the suit is a significant concern that can compromise its protective capabilities.

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