Failure analysis of girth weld cracking of mechanically lined pipe used in gasfield gathering system

被引：20

作者：

Fu, A. Q. ^{[1
,2
]}

Kuang, X. R. ^{[1
,2
]}

Han, Y. ^{[1
,2
]}

Lu, C. H. ^{[1
,2
]}

Bai, Z. Q. ^{[1
,2
]}

Yin, C. X. ^{[1
,2
]}

Miao, J. ^{[1
,2
]}

Feng, Y. R. ^{[1
,2
]}

Wei, Y. G. ^{[3
]}

Tang, Q. ^{[3
]}

Yang, Y. ^{[3
]}

机构：

[1] China Natl Petr Corp, Tubular Goods Res Inst, Xian 710077, Peoples R China

[2] State Key Lab Performance & Struct Safety Petr Tu, Xian 710077, Shaanxi, Peoples R China

[3] PetroChina Co Ltd, Tarim Oilfield Co, Korla 841000, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2016年 / 68卷

关键词：

Mechanically lined pipe; Girth weld; Cracking; Martensite; Stress;

D O I：

10.1016/j.engfailanal.2016.05.034

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Girth weld cracking of mechanically lined pipe was occurred after 75 days operation in a gasfield gathering system in China. Failure causes were analyzed based on operation histories, field documents, and laboratory tests. Results showed that the girth weld failure was mainly due to two aspects, girth weld martensite microstructure and external stress. The crack was initiated 'from sealing pass zone and filling pass zone, which is a hard and brittle martensite structure with hardness of HV 350-450. The failed pipe area had undergone the heavy rain for 2 days, pulling stress, bending stress, and shear stress generated by soil movement resulted in high stress concentration at girth weld. The girth weld cracking failure was initiated from outer carbon steel, and propagated along the weld-fusion line in intergranular mode, which is a typical stress corrosion cracking failure. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：64 / 75

页数：12

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