National Engineering Laboratory for Pipeline Safety

Beijing, China

National Engineering Laboratory for Pipeline Safety

Beijing, China

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Zeng C.,National Engineering Laboratory for Pipeline Safety | Wu C.,National Engineering Laboratory for Pipeline Safety | Zuo L.,National Engineering Laboratory for Pipeline Safety | Zhang B.,National Engineering Laboratory for Pipeline Safety | And 3 more authors.
Energy | Year: 2014

In this paper artificial neural network is introduced to forecast the daily electricity consumption of a multiproduct pipeline which is used to drive oil pumps. Forecasting electricity energy consumption is complicated since there are so many parameters affecting the energy consumption. Two different sets of input vectors are selected from these parameters by detailed analysis of energy consumption in this study, and two corresponding multilayer perceptron artificial neural network (MLP ANN) models are developed. To enhance the generalization ability, the numbers of hidden layers and neurons, activation functions and training algorithm of each model are optimized by the trial-and-error process step by step. The performances of the two proposed MLP ANN models are evaluated on real data of a Chinese multiproduct pipeline, and compared with two linear regression and two support vector machine (SVM) models which are produced using different inputs. Results show that the two MLP ANN models have very high accuracy for prediction and better forecasting performance than the other models. The proposed input vectors and MLP ANN models are useful not only in the effective evaluation of batch scheduling and pumping operation, but also in the energy consumption target setting. © 2014.


Yao D.,China National Petroleum Corporation | Zhang L.,China Petroleum Pipeline Bureau International | Fan Y.,China National Petroleum Corporation | Fan Y.,National Engineering Laboratory for Pipeline Safety | And 4 more authors.
Materials Science Forum | Year: 2016

To confirm pipeline designs and validate the weld toughness, extensively works of Curved Wide Plate (CWP) test methods was carried out. The method of Two Clip Gauge-CTOD was firstly introduced in CWP test in this paper. The test results of CWP analyzed by Two Clip Gauge-CTOD method and Compliance—J method was compared. The CTOD-R curves achieved by these methods showed the good consistence with each other. Furthermore, the difference of the test results among SENB(single edge-notched bend), SENT(single edge-notched tensile) and CWP was discussed. It shows that the toughness obtained by SENB is relatively conservative, and CWP and SENT are recommend to be chosen for pipeline steel welds toughness test. © 2016 Trans Tech Publications, Switzerland.


Wu J.,China National Petroleum Corporation | Yao D.,China National Petroleum Corporation | Yao D.,National Engineering Laboratory for Pipeline Safety | Yuan X.,China National Petroleum Corporation | And 4 more authors.
Materials Science Forum | Year: 2016

In the pipeline construction, the girth welds tend to be the weakness because of defects and microstructure. The importance of suitable assessment of various defects in the weld is not only to prevent the cracks from unstable growth to cause catastrophic accident but also can effectively reduce the weld repair to reduce construction cost. Although many welding defects assessment methods and codes are used in this field, there are many differences among them. In this paper, the welding defect assessment methods, such as API 1104 and BS7910, were studied. The results show the key factors that affect the result of these assessment methods. The application of these methods was also discussed. The results indicate that API 1104 level1 has the highest conservatism, while API 1104 level 2 is next. © 2016 Trans Tech Publications, Switzerland.


Wang F.,China Petroleum Pipline Research Institute | Wang F.,National Engineering Laboratory For Pipeline Safety | Shi C.,Petroleum and Natural Gas Pipeline Engineering Quality Supervision Master Station | Fan Y.R.,China Petroleum Pipline Research Institute | And 3 more authors.
Advanced Materials Research | Year: 2013

16Mn flanges cracked during producing.Physical and chemical analysis of the cracking 16Mn flange were performed, it was found that the chemical composite of 16Mn flange agreed well with standard NB/T 47008-2011, but the physical properties of it were abnormal, the sharpy values of which were far below standard requriemet furthermore, the metallographic of the cracking 16Mn flange were bulky network polygonal ferrite and pearlite. And this was the main reason that caused the failure. And on the end some control motheds were suggested to this accident. © (2014) Trans Tech Publications, Switzerland.


Yang J.,National Engineering Laboratory for Pipeline Safety | Wang W.,National Engineering Laboratory for Pipeline Safety | Wang W.,China University of Petroleum - Beijing | Shi B.,National Engineering Laboratory for Pipeline Safety | And 5 more authors.
Fluid Phase Equilibria | Year: 2016

In present work, an improved regular solution model is established, based on the concept of regular solution and local composition theory. The local volume fractions φij are considered to include the influence of interaction energy between molecules on molecules' local distribution. A new expression for molar excess Gibbs free energy (gE) is developed for the calculation of activity coefficients. Regular solution (RS), Wilson (W) and modified regular solution (MRS) are used for the non-ideality of solid phase and regular solution is adopted for liquid phase. Compared with the experimental data of binary, ternary and quaternary n-alkane systems, the advantage of RS-MRS is illustrated, with the best predictions of wax appearance temperature (WAT) and solid precipitation curve, which proves that the non-random molecules distribution caused by interaction energy between molecules is essential for gE. It is the application of φij that enhances the prediction accuracy of RS-MRS. © 2016 Elsevier B.V.


You Z.,National Engineering Laboratory for Pipeline Safety | You Z.,China National Petroleum Corporation | Li Y.,National Engineering Laboratory for Pipeline Safety | Li Y.,China National Petroleum Corporation
Materials Science Forum | Year: 2016

In this paper, the application of 9% Ni steel in natural gas storage tanks and the welding thermal crack tendency of 9% Ni steel were studied. For the section shrinkage and breaking strength of tensile specimens at different temperature, the high temperature tensile test (600℃~1450℃) of 9%Ni steel was carried out by Gleeble 3500 thermal simulation machine. The nil-ductility transition temperature (NDT), nil-ductility stength temperature (NST) and ductility recovery temperature (DRT) of 9%Ni steel were identified. The result showed that the NDT for 9% Ni steel was 1400℃, the NST was 1430℃, the DRT is 1370℃, and the brittle temperature range (BTR) was 60℃. In this study, the welding hot crack of 9% Ni steel was a little sensitive. © 2016 Trans Tech Publications, Switzerland.


Xia P.,National Engineering Laboratory for Pipeline Safety | Xia P.,China National Petroleum Corporation | Yang L.,China National Petroleum Corporation | Guo X.,National Engineering Laboratory for Pipeline Safety | And 3 more authors.
Materials Science Forum | Year: 2016

The microstructural evolution of the high Nb X80 pipeline steel in Continuous Cooling Transformation (CCT) by Gleeble-3500HS thermal-mechanical simulation testing system was studied, the corresponding CCT curves were drawn and the influence of some parameters such as deformation and cooling rate on microstructure of high Nb X80 pipeline steel was analyzed. The results show that as cooling rate increased, the phase transformation temperature of high Nb X80 steel decreased, with the microstructure transformation from ferrite-pearlite to acicular ferrite and bainite-ferrite. When cooling rate was between 20°C/s and 30°C/s, the microstructure was comparatively ideal acicular ferrite, thermal deformation accelerates phase transformation notably and made the dynamic CCT curves move upward and the initial temperature of phase transformation increase obviously. Meanwhile the thermal deformation refined acicular ferrite and extended the range of cooling rate accessible to acicular ferrite. © 2016 Trans Tech Publications, Switzerland.


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.


Yang L.,China Petroleum Pipeline Research Institute | Yang L.,National Engineering Laboratory for Pipeline Safety | Sui Y.,China Petroleum Pipeline Research Institute | Sui Y.,National Engineering Laboratory for Pipeline Safety | And 6 more authors.
Materials Science Forum | Year: 2016

Two kinds of industry trial X90 pipeline steels which have different chemical composition were chosen as test objects, and the grain coarsening, microstructural characteristics and the variation rules of low-temperature impact toughness in weld CGHAZ of this two steel under different welding heat input were studied by physical thermal simulation technology, SEM, optical microscope and Charpy impact tests. The results showed that the microstructure in weld CGHAZ of 1# steel was mainly bainite ferrite(BF) and most of the M/A constituents were blocky or short rod-like; the grains of 2# steel were coarse and there was much granular bainite(GB). Meanwhile M/A constituents became coarser and their morphology changed from block to long bar; alloy content of X90 pipeline steel under different weld heat input had great effect on the grain size of original austenite. When heat input was lower than 20KJ/cm, the impact toughness in CGHAZ of lower alloy content pipeline steel was good; as heat input increased, impact toughness in CGHAZ of 1# steel increased to the values between 260J and 300J when heat input was between 20KJ/cm and 25KJ/cm and the dispersion of impact energy was small. The impact toughness of 2# steel decreased gradually and the impact energy had the obvious dispersion. © 2016 Trans Tech Publications, Switzerland.


Sheng Q.,National Engineering Laboratory for Pipeline Safety | Sheng Q.,China National Petroleum Corporation | Ye C.,National Engineering Laboratory for Pipeline Safety | Ye C.,China National Petroleum Corporation | And 6 more authors.
Materials Science Forum | Year: 2016

In this paper the water absorption properties of polyethylene shrink tape were analyzed for long-distance pipeline. In the water absorption experiments, the normal and high temperature type heat shrinkable tape from six different manufacturers were respectively immersed in water range from 24 h to 28 d. The results show that the water absorption of the normal and high temperature type heat shrinkable tape was steady under the condition of 144 h. Once exceeding 144h, the water absorption increased gradually. Furthermore, the glue layer of heat shrinkable tape had a greater impact on water absorption. And the water absorption of glue layer of heat shrinkable tape decreased with an increase of the hot glue layer thickness. © 2016 Trans Tech Publications, Switzerland.

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