Fatigue Properties Assessment of API 5L Gr. B Pipeline Steel Using Infrared Thermography

2018 ◽  
pp. 17-23 ◽  
Author(s):  
V. E. L. Paiva ◽  
R. D. Vieira ◽  
J. L. F. Freire
Keyword(s):  
Infrared Thermography ◽  
Pipeline Steel ◽  
Fatigue Properties

scholarly journals Experimental Research on Fatigue Properties of X80 Pipeline Steel for Synthetic Natural Gas Transmission

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Li Yan–hua ◽  
Feng Hui ◽  
Chi Qiang ◽  
Fei Fan ◽  
Gao Xiong-xiong ◽  
...  
Keyword(s):  
Natural Gas ◽  
Base Metal ◽  
Hydrogen Content ◽  
Volume Fraction ◽  
Pipeline Steel ◽  
Fatigue Properties ◽  
High Grade ◽  
Long Distance ◽  
X80 Pipeline Steel ◽  
Synthetic Natural Gas

In recent years, many synthetic natural gas demonstration projects have been put into operation all over the world, and hydrogen is usually contained in synthetic natural gas. X80 is the most commonly used high-grade pipeline steel in the construction of natural gas pipelines. The compatibility between high-grade pipeline steel and hydrogen directly affects safety and reliability of long-distance pipelines. Therefore, in order to study the effect of hydrogen content on fatigue properties of high-grade pipeline steel, fatigue specimens were taken from base metal, spiral welds, and girth weld of submerged arc spiral welded pipes, respectively. Specifically, the total pressure was 12 MPa and hydrogen content was from 0 to 5vol%. Experimental results indicate that the hydrogen significantly increases the fatigue crack growth rate for both base metal, spiral weld, and heat-affected zone of X80 pipeline steel for about ten times compared with reference environment nitrogen, hydrogen would greatly reduce the fatigue life of the X80 pipeline steel, and the fatigue lifetime would decrease with the increase in hydrogen volume fraction. In order to ensure the safe operation of SNG pipeline, the hydrogen content should be controlled as low as possible.

Crude Oil Corrosion Fatigue of L485MB Pipeline Steel

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Ľ. Gajdoš ◽  
M. Šperl ◽  
J. Bystrianský
Keyword(s):  
Crude Oil ◽  
Strain Rate ◽  
Corrosion Fatigue ◽  
Pipeline Steel ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Oil Pipeline ◽  
Oil Processing ◽  
Tension Loading ◽  
Aggressive Effect

An investigation was made into the fatigue properties of L485MB (X70) pipeline steel after 13 yr of exploitation as a crude oil pipeline material. Fatigue tests in zero-to-tension loading were carried out (i) in air, (ii) in crude oil, (iii) in a mixture of crude oil with rainwater, and (iv) in water separated from the crude oil phase. The aim of the investigation was to assess the degree of degradation of the fatigue properties of this steel due to the action of environments typical for crude oil processing and transport. The results are not directly comparable to any corrosion fatigue experienced by the crude oil pipeline, since the strain rate for the tests was higher by an order of five than the strain rate observed in typical loading cycles. The results showed that crude oil and a mixture of crude oil with rainwater had no aggressive effect on the steel in the sense of reducing its fatigue characteristics, while the separated water had an aggressive effect.

Fatigue Life Evaluation of Pipe Welds in Power Plant Using Advanced Nondestructive Methods

2007 ◽  
Vol 26-28 ◽  
pp. 1251-1254
Author(s):  
Sang Guk Lee ◽  
Keun Bong Yoo ◽  
Sung Keun Park ◽  
Duck Gun Park
Keyword(s):  
Fatigue Life ◽  
Power Plant ◽  
Fatigue Damage ◽  
Pipeline Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Life Evaluation ◽  
Fatigue Life Evaluation

The objective of this study is to estimate the feasibility of advanced nondestructive method(X-ray diffraction, AE(acoustic emission) and BN(barkhausen noise)measurement application for fatigue life evaluation of the high-temperature pipeline steel such as main steam pipe etc. in power plant. In this study, various nondestructive tests using various types of specimen simulated low cycle fatigue damage were performed in order to analyze fatigue properties when fatigue damage conditions become various stages such as 1/4, 1/2 and 3/4 of fatigue life, respectively. As a result of X-ray diffraction tests for specimens simulated fatigue damages, we conformed that the variation of the full width at half maximum intensity decreased in proportion to the increase of fatigue life ratio. And also, AE and BN signal due to fatigue damage has linear relationship with fatigue life ratio algebraically. From this relationship, it was suggested that direct expectation of the life consumption rate was feasible.

Synergistic action of hydrogen and stress concentration on the fatigue properties of X80 pipeline steel

2017 ◽  
Vol 700 ◽  
pp. 321-330 ◽  
Author(s):  
Teng An ◽  
Shuqi Zheng ◽  
Huangtao Peng ◽  
Xiangli Wen ◽  
Liqiang Chen ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Pipeline Steel ◽  
Synergistic Action ◽  
Fatigue Properties ◽  
X80 Pipeline Steel

Influence of hydrogen pressure on fatigue properties of X80 pipeline steel

2017 ◽  
Vol 42 (23) ◽  
pp. 15669-15678 ◽  
Author(s):  
Teng An ◽  
Huangtao Peng ◽  
Pengpeng Bai ◽  
Shuqi Zheng ◽  
Xiangli Wen ◽  
...  
Keyword(s):  
Hydrogen Pressure ◽  
Pipeline Steel ◽  
Fatigue Properties ◽  
X80 Pipeline Steel

Fatigue properties of ferrite/bainite dual-phase X80 pipeline steel welded joints

2016 ◽  
Vol 22 (3) ◽  
pp. 217-226 ◽  
Author(s):  
Z-P. Zhao ◽  
G-Y. Qiao ◽  
G-P. Li ◽  
W-W. Yang ◽  
B. Liao ◽  
...  
Keyword(s):  
Welded Joints ◽  
Pipeline Steel ◽  
Fatigue Properties ◽  
Dual Phase ◽  
X80 Pipeline Steel
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