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INDUSTRIAL NOISE continued - Retrofit
and Treatment
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Riyadh Refinery Noise Investigation Client: Fluor Daniel (Contractor) for Saudi Arabian Marketing and Refining Co. (SAMAREC) Location: Riyadh, Kingdom of Saudi Arabia Project Description: At the time of the study, the Riyadh Refinery was composed of a 120,000 barrel per day (BPD) crude refining facility plus various vacuum, hydrotreater, mercaptan oxidation, hydrocracker, asphalt treating, and hydrogen gas production units. The total refined products capacity was over 300,000 BPD plus nearly 50 million SCFD of hydrogen. The refinery processed Light Arabian and Khurais crude oil and supplied light and middle distillate products for mostly in-region usage. Scope: Noise Control Engineering: (a) On-site noise measurement survey, (b) Personnel noise exposure survey, and (c) Noise reduction investigation & planning. Regulatory Involvement and Environmental Documentation: Provided a detailed plant noise emissions survey report, personnel exposure results, and conceptual noise control methodology designs to the client for its use in discussions with kingdom environmental and worker health authorities. Noise Control Services: Being built in the early 1970’s and having on-going upgrading and expansion ever since, the on-site noise levels steadily increased over the years. As a first phase in a long-range strategy to assess and improve the general noise environment throughout the plant, a thorough and detailed existing-conditions survey was commissioned by SAMAREC refinery and corporate engineering groups. Being in a dedicated industrial park well outside of the capital’s city residential or commercial areas, there was little concern with community noise standards. Rather, the study focused on noise inside the facility, what equipment was generating the noise, how those levels might be impacting the refinery staff, and what could be done to reduce noise pollution as much as possible. In the course of the on-site measurements, noise spectrum readings were gathered at discrete sampling points, noise level data were collected at significant, individual noise sources, fenceline readings were taken all along the facility’s perimeter, and noise dosimetry samples were made on a representative number of the plants 1,200+ workers. In all, nearly 3,000 noise spectrum samples were made throughout the plant’s 17 processing and support facility areas, while nearly 100 employees were monitored for individual noise exposure over their working shifts. The discrete samples were tabulated, plotted on layout drawings, and used to construct overall noise level contour maps which depicted areas of the 550+ acre site that had noise levels at or above 85 dBA. Dozens of individual noise sources were sampled and photographed to define the noise emissions characteristics and to aid in the formulation of conceptual noise control methodologies. A comprehensive report was written with survey and dosimetry results, plus noise control recommendations (with ROM costs); encompassing two large volumes. In the report, the processing areas with noise levels above 85 dBA were depicted on color contour maps, multiple noise samples around individual equipment items were shown graphically, and the dosimetry summaries were tabulated for each worker classification. Finally, to tie all the measured information together, an encompassing set of noise reduction recommendations was presented to the client, ranked according to greatest worker benefit versus lowest cost, as a foundation for future noise control engineering efforts at the refinery. |
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