Assessment and Inspection of Corrosion Induced Risk About Offshore Pressure Vessels

doi:10.11902/1005.4537.2020.029

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 592-598 DOI: 10.11902/1005.4537.2020.029

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Assessment and Inspection of Corrosion Induced Risk About Offshore Pressure Vessels

ZHOU Ran¹, ZHANG Xiaolei²(

), LI Xiangfeng¹, LING Aijun¹, DU Jiangang³

1. China Classification Society Offshore Engineering Technology Center, Tianjin 300457, China
2. China Classification Society Tianjin Branch, Tianjin 300457, China
3. China Classification Society, Beijing 100007, China

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Abstract

Referring to the standard API 581 and considering the field environmental situation as well as the relevant corrosion mechanism of pressure vessels, a quantitative analysis method has been proposed to analyze and calculate the damage coefficient of various type, failure probability and failure consequence for pressure vessels. The risk levels of the pressure vessels may be differentiated as several grades, in accordance with the established risk acceptance criteria. Therewith, a proper plant related with schedule, content and measures of inspection, as well as, the relevant control of risk consequences may be formulated for high-risk vessels and components. The research results can be beneficial to the accurate and quantitative evaluation of the risk degree of pressure vessels, and the confirmation of relevant inspection plant for risks. The proposed method is of great significance to the reasonable allocation of human and financial resources for the on-site inspection and the safe production control of platforms. In conclusion, this method has been successfully applied to FPSO in the China sea and may further be adopted as a reference for other projects.

Key words: API 581 standard pressure vessel risk inspection

Received: 03 March 2020

ZTFLH:

TE38

Fund: High Technology Ship Project of Ministry of Industry and Information Technology(G014614002);Seventh Generation of Ultra Deep Water Drilling Platform (Ship) Innovation Project

Corresponding Authors: ZHANG Xiaolei E-mail: zhangxiaolei@ccs.org.cn

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Cite this article:

ZHOU Ran, ZHANG Xiaolei, LI Xiangfeng, LING Aijun, DU Jiangang. Assessment and Inspection of Corrosion Induced Risk About Offshore Pressure Vessels. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 592-598.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.029 OR https://www.jcscp.org/EN/Y2020/V40/I6/592

Fig.1 Process of corrosion risk and inspection in pressure vessel

Table 1 Design basic date sheet of production separator vessel[I]

Table 2 Design basic date sheet of production separator vessel[II]

Table 3 On-site inspection date sheet of production separator vessel[I]

Table 4 On-site inspection date sheet of production separator vessel[II]

Table 5 On-site inspection date sheet of production separator vessel[III]

Fig.2 Corrosion states of cylinder (a) and head (b) on site

Time			D_f^thin	D_f^SSC	D_f^HIC/SOHIC-H $2$ ^S	D_f^CLSCC	D_f^ext	D_f^CUIF	D_f^ext-CLSCC	D_f^CUI-CLSCC	D_f(t)
t=0			8.65	1	0.5	50	1.92	1.92	1	5	63.65
RBI date (1.5)			11.93	1.56	0.78	78	2.58	2.63	1.56	7.8	11.93+55×t^1.1
t=2.5	A	[1,2.36]	14.45	2.74	1.37	21.92	2.56	2.57	2.74	2.74	17.02+8×t^1.1
	A	t≥2.36	14.45	2.74	1.37	21.92	2.56	2.57	2.74	2.74	14.45+9×t^1.1
	B	[1,1.26]	14.55	2.74	1.37	54.8	2.57	2.59	2.74	5.48	17.14+20×t^1.1
	B	t≥1.26	14.55	2.74	1.37	54.8	2.57	2.59	2.74	5.48	14.55+22×t^1.1
	C		14.72	2.74	1.37	137	2.57	2.62	2.74	13.7	14.72+55×t^1.1

Table 6 Calculation results of POF for cylinder

Time			D_f^thin	D_f^SSC	D_f^HIC/SOHIC-H $2$ ^S	D_f^CLSCC	D_f^ext	D_f^CUIF	D_f^ext-CLSCC	D_f^CUI-CLSCC	D_f(t)
t=0			17.31	1	0.5	50	3.85	3.85	1	5	72.31
RBI date (1.5)			20.3	1.56	0.78	78	3.92	4.58	1.56	7.8	20.3+55×t^1.1
$t = 2.36$	A	[1,4.43]	20.2	2.57	1.29	20.56	4.5	5.14	2.57	2.57	25.34+8×t^1.1
	A	t≥4.43	20.2	2.57	1.29	20.56	4.5	5.14	2.57	2.57	20.2+9×t^1.1
	B	[1,2.38]	20.4	2.57	1.29	51.4	4.51	5.18	2.57	5.14	25.58+20×t^1.1
	B	t≥2.38	20.4	2.57	1.29	51.4	4.51	5.18	2.57	5.14	20.4+22×t^1.1
	C		20.62	2.57	1.29	128.5	4.53	5.24	2.57	12.85	20.62+55×t^1.1

Table 7 Calculation results of POF for left head

Table 8 Acceptable criteria for risk of economic loss

Fig.3 Curves of left head POF

Fig.4 Curves of cylinder POF

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