Industrial Noise Measurement and Noise Contour Mapping: A Case Study in Power Plant, Rayong Province, Thailand
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Abstract
Introduction: This study aimed to assess the noise level in a working environment and to illustrate noise contour maps to define areas for wearing personal protective equipment in the electricity production process of the power plant in Rayong province.
Methods: The measurement of noise levels was divided into all areas, a total of 1,700 points, using the sound level meter model NL-42EX (Class2) standardized by IEC61672 Type2, ANSI S1.4, JISC1509-1. Then, the results were illustrated to create the noise contour map and define areas for wearing personal protective equipment.
Results: Compared to the standard noise levels that allowed employees to average receive throughout a day's work in 2018 from the Department of Labor Protection and Welfare, 45 points were detected over the standard level at 85 dB(A) (2.5 %) at the areas of machinery works continuously, steam turbines, gas turbines, steam generators, etc. Protective equipment and measures must be implemented for electricity production workers. To prevent hearing impairment, one should initially wear personal protective equipment, which can reduce noise exposure by Ear Muff. The derated NRR is 24 dB(A), and the sound level of the employee when wearing an ear muff is 65.7 dB(A), which is a safe sound level.
Conclusion: Additionally, a hearing conservation program should be implemented to comply with the legislation and reduce risks to employees' hearing performance.
Keywords: Noise Measurement, Noise contour mapping, Power plant
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