Experimental study on failure features of petrochemical pipelines under jet fire

doi:10.16265/j.cnki.issn1003-3033.2022.01.018

Abstract

Abstract:

In order to explore thermodynamic response law of petrochemical pipelines under jet fire, a scale-up test platform was built according to similarity theory to carry out experimental study on this topic. Based on analysis on pipelines' thermodynamic response and domino evolution in fire, influence of various factors on their temperature rise and failure was discussed, and a quantitative calculation model of pipeline failure time was established by adopting strength theory. The results show that fire power is a dominant factor of pipeline failure, along with its increase, failure time will be shortened. Horizontal jet fire has the greatest impact, and the peak temperature of pipeline is nearly doubled compared with the case of vertical jet fire. Under the situation of multiple jet fire sources, flame intensity and coverage area increase sharply, while peak temperature reaches as far as 800 ℃, resulting in failure of steel structure pipelines' strength. Liquid medium will accelerate pipeline failure, and pipeline pressure, size, distance from fire source all have significant influence on its failure.

Key words: jet fire, petrochemical pipeline, thermal response, pipe failure, fire power

ZHOU Ning, WU Lulu, LI Xue, LI Xuwei, SHI Jingjie, CAO Linlin. Experimental study on failure features of petrochemical pipelines under jet fire[J]. China Safety Science Journal, 2022, 32(1): 135-141.

Figures/Tables 9

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Tab.1

Thermal response law of No. 44 and No. 265 pipeline under different jet fire sources

喷射火源	44号管道		265号管道
喷射火源	峰值温度/℃	温升速率/(℃· $s - 1$ )	峰值温度/℃	温升速率/(℃· $s - 1$ )
65型单源喷射	680	8	350	2.5
35&65型双源喷射	705	12.5	800	15
50&65型双源喷射	710	13	850	17

Tab.1

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管道编号	工作压力 p/MPa	实际压力 σ_M/MPa	失效温度 t_s/℃
44	4	38	400
管道编号	工作压力 p/MPa	实际压力 σ_M/MPa	失效温度 t_s/℃
265	3.5	35.18	400
55	1.8	14.56	550
54	1.8	37.39	310
167	1.6	30.48	450
17	1.5	20.53	400
18	1.9	22.84	500

管道编号	44(液)			265(液)			55(气)			54(液)
喷嘴孔径/mm	35	50	65	35	50	65	35	50	65	35	50	65
是否失效	否	是	是	是	是	是	否	否	否	否	否	否
失效时间/s	—	75	55	285	34	20	—	—	—	—	—	—
管道编号	167(气)			17(液)			18(气)
喷嘴孔径/mm	35	50	65	35	50	65	35	50	60
是否失效	否	否	否	否	是	是	否	否	否
失效时间/s	—	—	—	—	125	99	—	—	—