China Petroleum Pipeline Research Institute

Langfang, China

China Petroleum Pipeline Research Institute

Langfang, China
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Ligang L.,Yanshan University | Hong X.,Yanshan University | Qiang L.,Hebei University of Technology | Yu L.,China Petroleum Pipeline Research Institute | And 3 more authors.
Materials Science and Engineering A | Year: 2017

The quasi-static fracture toughness KIC and J0.2BL(JIC), Charpy V-notch impact toughness CVN of ferrite-bainite (F/B) X70 pipeline steels with different phase content and morphologies were studied by experiments and numerical simulations at content temperature of −10 ℃. The stress-strain curves were obtained by experiments and unit cell model simulation. The results show that fracture toughness is strongly affected by bainite content. The fracture toughness increases with decreasing the bainite volume fracture fB and increasing aspect ratio Ra and neighboring factor Nf. Meantime, the aspect ratio Ra is more effective in improving the fracture toughness of tested steels compared with the neighboring factor Nf. For F/B X70 pipeline steel, two quantitative relationships have been derived, which correlates J0.2BL(JIC) and CVN with bainite content and morphologies in equations. It means that J0.2BL(JIC) can be calculated when CVN, fB, Ra and Nf of several typical F/B X70 pipeline steels are obtained. Although the quantification is specific to F/B X70 pipeline steels, the approach and model developed in this work can be applied to other metal structure materials. © 2017 Elsevier B.V.


Li X.,China University of Petroleum - East China | Shang C.,University of Science and Technology Beijing | Han C.,Petroleum ChinaWest East Gas Pipeline Company | Fan Y.,China Petroleum Pipeline Research Institute | Sun J.,China University of Petroleum - East China
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2016

After decades of development, mechanical properties of pipeline steels have a good combination of strength and toughness. But after welding, in the heat affected zone (HAZ), microstructure of the base plate was erased by the welding thermal cycle. Several subzones with different microstructures were formed in the HAZ due to different thermal histories they went through. Toughness of the HAZ varies due to the heterogeneous microstructure. In this work, toughness of the HAZ of X100 pipeline steel was examined with two notch locations. Low toughness of 51 J was obtained when the notch encountered intercritically reheated coarsen-grained (ICCG) HAZ and high toughness of 183 J when the notch did not contain ICCGHAZ. Meanwhile, different sub-zones in the HAZ were simulated using Gleeble thermal simulation machine. Simulated coarsen-grained (CG) HAZ, finegrained (FG) HAZ and intercritically reheated (IC) HAZ with uniform microstructure had good toughness of 244, 164 and 196 J, respectively. In contrast, toughness of simulated ICCGHAZ was only 32 J. Therefore, ICCGHAZ consisting of coarse granular/upper bainite and necklace-type martensite-austenite (M-A) constituent along grain boundaries was proved to be the primary reason for low toughness. Instrumented Charpy impact test results showed that ICCGHAZ could notably embrittle the sample and lower the crack initiation energy. Characterization on the fracture surfaces of the as-fractured Charpy impact specimens showed that ICCGHAZ was found to be the crack initiation site of the whole fracture, and M-A constituent in the ICCGHAZ was characterized as cleavage facet initiation. Fracture mechanisms in the CGHAZ and ICCGHAZ were separately investigated using EBSD. The results showed that necklace-type M-A constituent in the ICCGHAZ notably increased the frequency of cleavage microcracks nucleation. Fracture mechanism changed from nucleation controlled in the CGHAZ to propagation controlled in the ICCGHAZ due to the existence of necklace-type M-A constituent. Therefore, the formation of necklace- type M-A constituent in the ICCGHAZ could not only cause notable drop of toughness in the HAZ, but also change the fracture behavior/mechanism. Hence, research on how to control the distribution status of M-A constituent in the ICCGHAZ is the key to improve the toughness of a weld joint. © All right reserved.


Cheng M.,China Petroleum Pipeline Engineering Corporation | Zhang W.,China Petroleum Pipeline Engineering Corporation | Sun P.,China Petroleum Pipeline Research Institute | Huang L.,China Petroleum Pipeline Research Institute
ICPTT 2012: Better Pipeline Infrastructure for a Better Life - Proceedings of the International Conference on Pipelines and Trenchless Technology 2012 | Year: 2013

When MTBM is used to construct a tunnel in cohesive soil area, the main force need to resist is adhesive force generated by soil or clay around the machine, which can be reduced by the lubrication. In this case, the most commonly used lubrication is bentonite mud, which is injected through ports in the jacking head and filled outside of the pipes. In rock area, the formation is hard enough to support the pipes, if both entrance and exit are sealed well enough to prevent the lubrication lose, and also make sure the mud be injected continuously and around the pipe all the time which makes the pipes "float", frictions between pipes and rocks will be nearly zero under this "perfect" status. So we can conclude that in rock area, the lubrication system is not only to reduce the resistance force coming from the soil, but also to lower the frictional force coming from rocks. In some sedimentary rock areas, clean water might be the best lubrication. This theory has been successfully used and proved in different crossings of MTBM site in China's second West-East Gas pipeline project. © 2013 American Society of Civil Engineers.


Cheng M.,China Petroleum Pipeline Engineering Corporation | Zhang W.,China Petroleum Pipeline Engineering Corporation | Sun P.,China Petroleum Pipeline Research Institute | Huang L.,China Petroleum Pipeline Research Institute
ICPTT 2014 - Proceedings of the 2014 International Conference on Pipelines and Trenchless Technology | Year: 2014

With the construction of the first, second and third pipeline of the West-East Gas Transmission Pipeline Project, Myanmar-China Oil and Gas Pipeline and other national key oil & gas pipeline network, long distance, large diameter, high pressure, complicated geological, hydrological and environmental conditions become the key points for pipeline construction. As the critical works for the whole pipeline construction, the crossing project has inevitable construction risks. However, qualitative analysis was mainly applied for comparison and selection of the previous project proposals. Concerning risk analysis, focus given to the engineering risks while risks of construction period, investment as well as the environment risk resulted therefrom are always ignored. This may probably lead to the proposal selection going to the wrong way. The risk events encountered during implementation of project may lead to delay of the construction period and underestimated (or anticipated) investment, for some cases, temporary construction proposal is adopted to ensure the construction be accomplished as scheduled. In this case, works will be wasted and the whole project will be forced to stay at a passive state. To obtain a reliable, feasible and rational design proposal, it is inevitable to perform comparison and selection of proposals based on the risk analysis. Based on the risk analysis, comparison and selection of the crossing design proposals can proceed in the following steps: 1) A number of possible design proposals (including proposals for large excavation, directional drilling, shield tunnel and pipe-jacking tunnel), shall be preliminarily determined by combining the factors of engineering geology, hydrology, weather, site, environment, etc. 2) A variety of risk analysis shall be conducted for all the design proposals to be selected through comparison; 3) A comprehensive comparison shall be performed for the risk analysis result of each proposal; and the design proposal which involves low risk other than high risk shall be selected according to the actual conditions of the project as well as the Employer's requirements. © 2014 American Society of Civil Engineers.


Liu Y.,China Petroleum Pipeline Research Institute | Liu Y.,National Engineering Laboratory for Pipeline Safety | Ma A.,Tian Jin SERI Machinery Equipment Co. | Feng B.,China Petroleum Pipeline Research Institute | Feng B.,National Engineering Laboratory for Pipeline Safety
Materials Science Forum | Year: 2016

In this paper, the simulation heat affected zone (HAZ) continuous cooling transformation (SHCCT) curve of X90 pipeline steel was drew by using Gleeble 3500 simulator. The results show that the trend of hardening of the weld HAZ of X90 pipeline steel was moderate, and softening tendency was not significant. When cooling rate was between 1°C/s and 10°C/s, the microstructure of X90 pipeline steel weld HAZ were composed of granular bainite and lath bainite. The recommended welding heat input of X90 pipeline steel was between 21kJ/cm and 66.4kJ/cm, and the weld preheating temperature was controlled about 100°C. In conclusion, optimization control measures on the microstructure and properties of X90 pipeline steel weld HAZ are presented by above comprehensive analysis. © 2016 Trans Tech Publications, Switzerland.


Liu Q.,China Petroleum Pipeline Research Institute | Li J.,China Petroleum Pipeline Research Institute | Chen P.,Tianjin University
IET Conference Publications | Year: 2012

The forgings is widely used in mechanical manufacturing industry. The online measurement with high-precision is very important for the quality control. In order to measure the large forgings' size, a system that using linear structured light source and CCD image sensor is developed. The system puts forward to test the deformation of the light plane when the light meets the surfaces of workpieces. By analyzing the laser curve image, it calculates the spacial conic and the parameters thought coordinates transition. The measuring principle and the building process of the system are described. To detect the structuredlighted- stripe vision sensor model, a new calibration method based on the combined target is proposed. The experiments demonstrate the high repeatability and accuracy of the system. The experimental results have proved that the repeatable accuracy is within 0.04mm and the measured relative error is less than 0.13%.


Li X.,University of Science and Technology Beijing | Fan Y.,China Petroleum Pipeline Research Institute | Ma X.,McMaster University | Subramanian S.V.,McMaster University | Shang C.,University of Science and Technology Beijing
Materials and Design | Year: 2015

The objective of the present study is to elucidate the impact of Martensite-Austenite (M-A) constituents formed at different intercritical temperatures on toughness. Gleeble thermal simulation technique has been used to produce different intercritically reheated coarse grained heat affected zone (ICCGHAZ) microstructures corresponding to different reheating temperatures between Ac1 and Ac3. The instrumental Charpy impact test results of dual pass thermal simulation showed that Charpy impact toughness improved with the increasing of second peak temperature. The fraction of M-A constituent was similar at each temperature. Near-connected coarse necklacing M-A constituents (2.4μm) formed at 760°C (near to Ac1) led to the worst toughness (42J) while those formed at 800°C and 840°C (near to Ac3) resulted in better toughness, respectively 80J and 105J. M-A constituents formed at 800°C were still coarse (2.2μm) but had larger interspace compared to 760°C. And those formed at 840°C were refined (1.9μm) and well dispersed by matrix. Notable difference in toughness values is attributed to the size and distribution of M-A constituents formed at different intercritical temperatures. It is possible to achieve better toughness if M-A constituents are well controlled: smaller in size and larger in interspacing. © 2014 Elsevier Ltd.


Li Y.,China University of Petroleum - East China | Li Z.,China University of Petroleum - East China | Li Z.,China Petroleum Pipeline Research Institute | Wang W.,China University of Petroleum - East China
Journal of Loss Prevention in the Process Industries | Year: 2015

Rollover is a potential risk to the safety of LNG storage tanks during the LNG storage process, so study of its prevention method is very important. In this paper, rollover phenomenon in a liquefied natural gas (LNG) storage tank is modeled physically and mathematically. Its evolution is simulated using FLUENT™ software from the breakdown of stratification to the occurrence of rollover. Results show that the evolution consists of three phases: the initial phase where rollover occurs near the side wall of the storage tank; the turbulent phase where rollover transfers to the center of the tank; and the final phase where new layers evolve. Based on these phases, rollovers in 160,000, 30,000, and 5000 m3 LNG storage tanks are simulated at varying initial density differences, and a rollover coefficient is defined to describe rollover intensity. The simulations show that the rollover coefficient initially increases within a small scope and then increases rapidly with the increment of initial density difference. This turning point is chosen to be the rollover threshold, which is regarded as the critical density difference in this study. The critical density differences obtained from the simulation results of the 160,000, 30,000, and 5000 m3 LNG storage tanks are 3, 5, and 7 kg/m3, respectively, which can be used as their rollover criteria to ensure the safety of LNG storage tanks. © 2015 Elsevier Ltd.


Zhang P.,China Petroleum Pipeline Research Institute | Han Z.,China Petroleum Pipeline Research Institute | Ye C.,China Petroleum Pipeline Research Institute | Zhu L.,China Petroleum Pipeline Research Institute
NACE - International Corrosion Conference Series | Year: 2012

The objective of this research was to investigate the actual status of its problems, regional distribution and mitigation measures studies of black powder inside of Chinese long-distance natural gas pipelines. The information documented in this paper was analyzing basic information, operating parameters, gas quality data, powder composition testing and pigging information of gas pipelines with the black powder. In addition the paper involved the standards of gas pipeline transportation and the related criterions in China. ©2012 by NACE International.


Wang N.,China Petroleum Pipeline Research Institute | Sun P.,China Petroleum Pipeline Research Institute | Sun J.,China Petroleum Pipeline Research Institute
ICPTT 2014 - Proceedings of the 2014 International Conference on Pipelines and Trenchless Technology | Year: 2014

This paper discusses risk identification, effective risk reduction methods, controlling measures for key construction procedures and impacts to the environment during HDD construction projects. © 2014 American Society of Civil Engineers.

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