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Environ Sci Pollut Res Int. 2018 Jul;25(19):18434-18442. doi: 10.1007/s11356-018-1978-2. Epub 2018 Apr 25.

Research on the effect of wall corrosion and rim seal on the withdrawal loss for a floating roof tank.

Wang Y1,2, Liu M3, Liu F3,4, Zhao C3, Zhao D3, Han F3, Liu C3,4.

Author information

1
College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, People's Republic of China. wyqupc@163.com.
2
State Key Laboratory of Petroleum Pollution Control, China University of Petroleum (East China), Qingdao, 266580, People's Republic of China. wyqupc@163.com.
3
College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, People's Republic of China.
4
State Key Laboratory of Petroleum Pollution Control, China University of Petroleum (East China), Qingdao, 266580, People's Republic of China.

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.

KEYWORDS:

Floating roof tank; Rim seal; Volatile organic compounds; Wall corrosion; Withdrawal loss

PMID:
29696540
DOI:
10.1007/s11356-018-1978-2
[Indexed for MEDLINE]

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