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[Noise exposure in a dry dock]

S Atzeri1, L Vacca

  • 1Istituto di Medicina del Lavoro, Università di Cagliari.

La Medicina Del Lavoro
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

Noise exposure in dry docks, primarily from manual tools, varied by task. Daily noise exposure levels ranged from 15-30 dBA, fitting normal distribution patterns for sampling strategies.

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Area of Science:

  • Occupational Health and Safety
  • Environmental Acoustics
  • Industrial Hygiene

Background:

  • Noise exposure in ship refitting environments, particularly dry docks, presents unique challenges due to manual tools and non-routine tasks.
  • Worker noise exposure can be influenced by extraneous factors, simultaneous job roles, and confined workspaces.

Purpose of the Study:

  • To assess personal noise exposure levels for various tasks in a dry dock environment.
  • To investigate the impact of different job roles and task variations on daily noise exposure.
  • To evaluate the suitability of noise exposure data for compliance and epidemiological studies.

Main Methods:

  • Personal noise exposure monitoring using Larson Davis mod. 700 integrating sound level meters over 13 days.
  • Recording time history of equivalent continuous sound level with 10-second integration time, with microphones placed on helmets.

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  • Statistical analysis including analysis of variance and Kolmogorov-Smirnov test to assess significance and distribution.

    • Main Results:

    • Daily noise exposure levels ranged from 15 to 30 dBA for most tasks, excluding woodworkers.
    • Analysis of variance showed no significant differences in mean noise exposure for welders (p > 0.3) and painters (when considered solely).
    • Experimental distributions of daily noise exposure for all tasks fit a normal distribution (p > 0.1 confidence level).

    Conclusions:

    • Noise exposure levels in dry docks are task-dependent but generally fall within a specific range.
    • The normal distribution of noise exposure data supports the development of effective sampling strategies for compliance and epidemiological research.
    • Understanding task-specific noise exposure is crucial for managing occupational health risks in ship repair facilities.