Abstract
Storage tanks are important parts of volatile organic compound (VOC) fugitive emission sources of the petrochemical industry; the floating roof tank is the main oil storage facility at present. Based on the mechanism of withdrawal loss and the type of rim seal, octane and gasoline were taken as the research objects. A model instrument for simulating the oil loading process by the 316 stainless steel and A3 carbon steel as the test piece was designed, and the film thickness was measured by wet film thickness gauge to investigate the influence of the corrosion of the tank wall and rim seal on the withdrawal loss for floating roof tanks. It was found that withdrawal loss was directly proportional to the shell factor, and the oil thickness of the octane and gasoline increased with the strength of the wall corrosion with the same wall material and rim seal. Compared with the untreated test piece, the oil film thickness of the octane/gasoline was increased by 7.04~8.57 μm/13.14~21.93 μm and 5.59~11.49 μm/11.61~25.48 μm under the corrosion of hydrochloric acid for 32 and 75 h, respectively. The oil film thickness of octane and gasoline decreased with the increasing of the rim seal, and the oil film thickness of the octane decreased by 11.97~28.90% and 37.32~73.83% under the resilient-filled seal and the double seal, respectively. The gasoline dropped by 11.97~31.18% and 45.98~75.34% under the resilient-filled seal and the double seal, respectively. In addition, the tank surface roughness reduced the compression of the rim seal on the tank wall, and the effect of scraping decreased. The API withdrawal loss formula for a floating roof tank was recommended to take into account the effect of the rim seal to improve the accuracy of the loss evaluation. Finally, some measures of reducing the withdrawal loss were proposed.
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Acknowledgements
The guidance of Appraisal Center for Environment and Engineering, Ministry of Environmental Protection is acknowledged.
Funding
This work was sponsored by the project of the National Natural Science Foundation of China (21505156) and the Fundamental Research Funds for the Central Universities (18CX02122A).
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Responsible editor: Philippe Garrigues
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Wang, Y., Liu, M., Liu, F. et al. Research on the effect of wall corrosion and rim seal on the withdrawal loss for a floating roof tank. Environ Sci Pollut Res 25, 18434–18442 (2018). https://doi.org/10.1007/s11356-018-1978-2
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DOI: https://doi.org/10.1007/s11356-018-1978-2