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http://dx.doi.org/10.7837/kosomes.2022.28.2.406

Study on the Change of Relative Humidity in Subsea Pipeline According to Drying Method  

Yang, Seung Ho (Department of Mechanical Engineering, Ulsan College)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.28, no.2, 2022 , pp. 406-413 More about this Journal
Abstract
The subsea pipeline pre-commissioning stage consists of the following processes: Flooding, Venting, Hydrotesting, Dewatering, Drying, and N2 Purging. Among these processes, drying and nitrogen purging processes are stipulated to reduce and maintain the relative humidity below dew point to prevent the generation of hydrate and the risk of gas explosion in the pipeline during operation. The purpose of this study is to develop an analysis method for the air drying and nitrogen purging process during pre-commissioning of the subsea pipeline, and to evaluate the applicability of the analysis method through comparison with on-site measurement results. An analysis method using Computational Fluid Dynamics (CFD) was introduced and applied as a method for evaluating the relative humidity inside a subsea pipeline, and it was confirmed that analysis results were in good agreement with the on-site measurement results for the air drying and nitrogen purging process of the offshore pipeline. If the developed air drying and nitrogen purging analysis method are used as pre-engineering tools for pre-commissioning of subsea pipelines in the future, it is expected to have a significant impact on the improvement of work productivity.
Keywords
Subsea pipeline; Pre-commissioning; Air drying; Nitrogen purging; Relative humidity; Dew point;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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