Numerical Simulation of Thermal Cycle of In-Service Welding on X70 Steel Gas Pipeline

2009 ◽  
Vol 79-82 ◽  
pp. 1169-1172 ◽  
Author(s):  
Yu Hua Chen ◽  
Yong Wang ◽  
Zheng Fang Wang
Keyword(s):  
Flow Rate ◽  
Thermal Cycle ◽  
Gas Flow ◽  
Gas Pressure ◽  
Gas Pipeline ◽  
Peak Temperature ◽  
Coarse Grain ◽  
Air Cooling ◽  
Gas Flow Rate ◽  
Oil Gas

In-service welding is a kind of important method to ensure the integrality of oil gas pipeline and the thermal cycle of which is significant for repairing. Used SYSWELD to establish model and simulate thermal cycle of in-service welding on X70 steel gas pipeline, compared thermal cycles of in-service welding and air-cooling welding, studied the influence of gas pressure and flow rate on thermal cycle. The result shows that peak temperature of the coarse grain in heat affected zone (CGHAZ) of in-service welding is similar to air cooling welding, but the cooling time of t8/5, t8/3 and t8/1 decreases at certain degree. Peak temperature of CGHAZ of in-service welding doesn’t vary match with gas pressure and flow rate either. t8/5, t8/3 and t8/1 decrease when gas pressure increases. t8/5 varies with the gas pressure linearly. When the pressure is less than 4MPa, t8/3 and t8/1 decrease rapidly while gas pressure increases. When the pressure is more than 4MPa, t8/3 and t8/1 decrease slowly while gas pressure increases. t8/5, t8/3 and t8/1 decrease when the flow rate increases. When gas flow rate is less than 10m/s, t8/5, t8/3 and t8/1 decrease rapidly while flow rate increases. When gas flow rate is more than 10m/s, t8/5, t8/3 and t8/1 decrease slowly while flow rate increases.

METHODOLOGICAL ASPECT OF ASSESSING RELIABILITY OF MEDIUM PRESSURE GAS PIPELINES

2021 ◽  
pp. 97-107
Author(s):  
A.I. Pashentsev ◽  
A.A. Garmider
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Methodological Approach ◽  
Gas Pipeline ◽  
Methodological Aspect ◽  
Gas Pipelines ◽  
Gas Flow Rate ◽  
Medium Pressure ◽  
Reliability Calculation

The author’s vision of the methodological aspect of assessing the reliability of medium pressure gas pipelines is presented. Analysis of existing methods for assessing the reliability of gas pipelines with the identification of positive and negative features was carried out, a methodological approach to assessing the reliability of medium pressure gas pipelines by gas flow rate and pressure was developed and tested, and a scale for identifying the results of reliability calculation was developed. The test conducted on the example of a really working gas pipeline with a test for reliability showed its promise.

The effect of gas flow rate on the wax deposition in oil-gas stratified pipe flow

2018 ◽  
Vol 162 ◽  
pp. 539-547 ◽  
Author(s):  
Jimiao Duan ◽  
Songsheng Deng ◽  
Shuo Xu ◽  
Huishu Liu ◽  
Ming Chen ◽  
...  
Keyword(s):  
Flow Rate ◽  
Pipe Flow ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Wax Deposition ◽  
Oil Gas

scholarly journals Measurement of Gas-Oil Two-Phase Flow Patterns by Using CNN Algorithm Based on Dual ECT Sensors with Venturi Tube

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1200 ◽  
Author(s):  
Zhuoqun Xu ◽  
Fan Wu ◽  
Xinmeng Yang ◽  
Yi Li
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Venturi Tube ◽  
Phase Flow ◽  
Gas Flow Rate ◽  
Two Phase ◽  
Oil Flow ◽  
Oil Gas

In modern society, the oil industry has become the foundation of the world economy, and how to efficiently extract oil is a pressing problem. Among them, the accurate measurement of oil-gas two-phase parameters is one of the bottlenecks in oil extraction technology. It is found that through the experiment the flow patterns of the oil-gas two-phase flow will change after passing through the venturi tube with the same flow rates. Under the different oil-gas flow rate, the change will be diverse. Being motivated by the above experiments, we use the dual ECT sensors to collect the capacitance values before and after the venturi tube, respectively. Additionally, we use the linear projection algorithm (LBP) algorithm to reconstruct the image of flow patterns. This paper discusses the relationship between the change of flow patterns and the flow rates. Furthermore, a convolutional neural network (CNN) algorithm is proposed to predict the oil flow rate, gas flow rate, and GVF (gas void fraction, especially referring to sectional gas fraction) of the two-phase flow. We use ElasticNet regression as the loss function to effectively avoid possible overfitting problems. In actual experiments, we compare the Typical-ECT-imaging-based-GVF algorithm and SVM (Support Vector Machine) algorithm with CNN algorithm based on three different ECT datasets. Three different sets of ECT data are used to predict the gas flow rate, oil flow rate, and GVF, and they are respectively using the venturi front-based ECT data only, while using the venturi behind-based ECT data and using both these data.

Experimental Study of Nozzle Characteristics by Drainage Method

2014 ◽  
Vol 644-650 ◽  
pp. 1422-1425
Author(s):  
Da Wei Qu ◽  
Zhan Cai Sa ◽  
Lu Yan Fan ◽  
Jun Yan Ma
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Duty Cycle ◽  
Gas Flow ◽  
Gas Pressure ◽  
Gas Flow Rate ◽  
Injection Frequency ◽  
Pressure Transmitter ◽  
Nozzle Opening

The characteristic of nozzle jeting is affected by injection frequency, gas pressure in the piping and duty cycle of the control signal.The experimental study is in order to determine nozzle’s opening frequency, duty cycle and pipe pressure affect to the gas flow rate using a drainage method, nozzle opening frequency and duty cycle are controled by mototron platform and ATI Vision calibration software,while using pressure transmitter to measure the change of pipe pressure relationship with duty cycle and frequency.

Influences of sputtering gas pressure and gas flow rate on microwave characteristics of FeCoAlO thin films

2011 ◽  
Vol 519 (23) ◽  
pp. 8292-8295 ◽  
Author(s):  
Feng Xu ◽  
Qiyun Xie ◽  
Nyugen Nyugen Phuoc ◽  
Shandong Li ◽  
Chong Kim Ong
Keyword(s):  
Thin Films ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Pressure ◽  
Gas Flow Rate ◽  
Microwave Characteristics

scholarly journals Experimental Study on the Influence of Moisture Content during Gas Depressurization Extraction

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Yuexia Chen ◽  
Xuexi Chen ◽  
Jiang Xu ◽  
Tingxiang Chu
Keyword(s):  
Moisture Content ◽  
Flow Rate ◽  
Gas Flow ◽  
Effective Permeability ◽  
System Analysis ◽  
Volumetric Strain ◽  
Gas Pressure ◽  
Gas Flow Rate ◽  
Coal Deformation ◽  
The Relationship

Although there are many reports about the influence of moisture in the process of gas extraction, studies about the influence of moisture on gas flow, permeability, and coal deformation by experimental system analysis are lacking. Physical simulations of gas depressurization extraction using triaxial servo-controlled seepage equipment for hot-fluid-solid coupling were conducted. The gas flow rate, permeability, and strain were analysed during gas depressurization extraction. The relationship between gas flow rate and gas pressure was a quadratic polynomial. Permeability and strain changed continuously with the decrease of gas pressure and interacted with each other during gas depressurization extraction. In the initial stage, the effective permeability decreased. With the continuous decrease of gas pressure, the permeability gradually recovered. When the gas pressure dropped to about 0.6 MPa, the permeability increased rapidly and the corresponding volumetric strain increased gradually. With the increase of moisture content, the relationship between gas flow rate and gas pressure became less significant. The experiments showed that the higher the moisture content, the lower the effective permeability and the larger the volumetric strain.

SCIENTIFIC AND ENGINEERING PRINCIPLES OF EFFICIENT FUEL USE AND ENVIRONMENTALLY FRIENDLY GAS COMBUSTION IN STOVE PLATES. PART 1. MODERN STATE-OF-THE-ART AND DIRECTIONS FOR IMPROVEMENT THE GAS BURNING IN DOMESTIC GAS COOKERS

2017 ◽  
pp. 3-18 ◽  
Author(s):  
B.S. Soroka ◽  
V.V. Horupa
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Renewable Energy Sources ◽  
Combustion Process ◽  
Orifice Diameter ◽  
Firing Process ◽  
Gas Flow Rate ◽  
Gas Combustion ◽  
Gas Stoves

Natural gas NG consumption in industry and energy of Ukraine, in recent years falls down as a result of the crisis in the country’s economy, to a certain extent due to the introduction of renewable energy sources along with alternative technologies, while in the utility sector the consumption of fuel gas flow rate enhancing because of an increase the number of consumers. The natural gas is mostly using by domestic purpose for heating of premises and for cooking. These items of the gas utilization in Ukraine are already exceeding the NG consumption in industry. Cooking is proceeding directly in the living quarters, those usually do not meet the requirements of the Ukrainian norms DBN for the ventilation procedures. NG use in household gas stoves is of great importance from the standpoint of controlling the emissions of harmful components of combustion products along with maintenance the satisfactory energy efficiency characteristics of NG using. The main environment pollutants when burning the natural gas in gas stoves are including the nitrogen oxides NOx (to a greater extent — highly toxic NO2 component), carbon oxide CO, formaldehyde CH2O as well as hydrocarbons (unburned UHC and polyaromatic PAH). An overview of environmental documents to control CO and NOx emissions in comparison with the proper norms by USA, EU, Russian Federation, Australia and China, has been completed. The modern designs of the burners for gas stoves are considered along with defining the main characteristics: heat power, the natural gas flow rate, diameter of gas orifice, diameter and spacing the firing openings and other parameters. The modern physical and chemical principles of gas combustion by means of atmospheric ejection burners of gas cookers have been analyzed from the standpoints of combustion process stabilization and of ensuring the stability of flares. Among the factors of the firing process destabilization within the framework of analysis above mentioned, the following forms of unstable combustion/flame unstabilities have been considered: flashback, blow out or flame lifting, and the appearance of flame yellow tips. Bibl. 37, Fig. 11, Tab. 7.

Sign in / Sign up

Export Citation Format

Share Document