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23-09: Design and Practical Considerations for Large Scale Asbestos Cement NDCT Refurbishments

$20.00 USD
$20.00 USD
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Multiple large power stations in South Africa operate using natural draft wet cooling towers (NDWCT). Most of these cooling towers were built using asbestos cement fill and have reached their end of life. Poor water quality at many of these plants has resulted in severe fill fouling which has led to significant reductions in cooling tower performance. In 2020, projects were initiated to replace the asbestos cement fill of multiple large NDWCTs to improve their thermal performance. In contrast to typical projects of this nature which use thermal performance guarantees to ensure a successful project, an alternative approach was followed. The process was guided by the outcomes of upfront test work and research which identified and documented the risks involved with such replacements. Following the alternative approach, the paper explores design considerations of such a project from initiation to execution. Matters of interest include fill selection, structural and mechanical characteristics of the fill, quality control of the plastic, thermal performance, a new fill support platform and fixed geometric challenges etc. Recommendations based on the experiences of both the end-user and design contractor, for future fill replacement of this nature have been provided.

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