Numerical simulation of currents induced by geomagnetic storms on buried pipelines: an application to the Tierra del Fuego, Argentina, gas transmission route

1999 ◽  
Vol 37 (1) ◽  
pp. 614-619 ◽  
Author(s):  
A. Favetto ◽  
A. Osella
Keyword(s):  
Numerical Simulation ◽  
Geomagnetic Storms ◽  
Tierra Del Fuego ◽  
Transmission Route ◽  
Buried Pipelines

scholarly journals Experimental and numerical simulation of buried pipelines subjected to large permanent ground displacements

2017 ◽  
Author(s):  
Άγγελος Τσάτσης
Keyword(s):  
Numerical Simulation ◽  
Buried Pipelines ◽  
Ground Displacements

[…] Η παρούσα Διδακτορική Διατριβή αποτελείται από δύο κύριες ενότητες. Η πρώτη ενότητα είναι αφιερωμένη στην απόκριση υπογείων αγωγών υποβαλλόμενων σε τεκτονική διάρρηξη κατακόρυφης βύθισης (κανονικά και ανάστροφα ρήγματα). Στόχος είναι η πλήρης προσομοίωση της διάρρηξης από το βραχώδες υπόβαθρο έως την επιφάνεια του εδάφους και η ταυτόχρονη μελέτη της δομητικής απόκρισης του αγωγού. Πλέον της ανελαστικής ανάλυσης του εδάφους και των συνθηκών επαφής εδάφους-αγωγού, ιδιαίτερη έμφαση δίδεται στην ορθή ανάλυση της εντόνως μη-γραμμικής απόκρισης του μεταλλικού κελύφους. Η δεύτερη ενότητα αναφέρεται στην απόκριση υπογείων αγωγών υποβαλλόμενων σε μεγάλες εδαφικές μετακινήσεις λόγω ενεργοποίησης περιστροφικής κατολίσθησης. Και για τις δύο (2) φορτίσεις καταρτήθηκε κατάλληλη αριθμητική μεθοδολογία η οποία εν συνεχεία βαθμονομήθηκε και επαληθεύτηκε έναντι πειραμάτων της βιβλιογραφίας αλλά και πειραμάτων μικρής κλίμακας που διεξήχθησαν στο Εργαστήριο Εδαφομηχανικής του Ε.Μ.Π. […]

scholarly journals A Study on Determining Time-Of-Flight Difference of Overlapping Ultrasonic Signal: Wave-Transform Network

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5140
Author(s):  
Zhipeng Li ◽  
Tong Wu ◽  
Wei Zhang ◽  
Xuyang Gao ◽  
Zhenqiu Yao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Arrival Time ◽  
Oil And Gas ◽  
Time Of Flight ◽  
Ultrasonic Signal ◽  
Signal Wave ◽  
Buried Pipelines ◽  
Ultrasonic Echo ◽  
Before And After ◽  
Novel Method

An ultrasonic sensors system is commonly used to measure the wall thickness of buried pipelines in the transportation of oil and gas. The key of the system is to precisely measure time-of-flight difference (TOFD) produced by the reflection of ultrasonic on the inner and outer surfaces of the pipelines. In this paper, based on deep learning, a novel method termed Wave-Transform Network is proposed to tackle the issues. The network consists of two parts: part 1 is designed to separate the potential overlapping ultrasonic echo signals generated from two surfaces, and part 2 is utilized to divide the sample points of each signal into two types corresponding to before and after the arrival time of ultrasonic echo, which can determine the time-of-flight (TOF) of each signal and calculate the thickness of pipelines. Numerical simulation and actual experiments are carried out, and the results show satisfactory performances.

Numerical Simulation on the Dynamic Response of Buried Pipelines Subjected to Blast Loads

2013 ◽  
Vol 671-674 ◽  
pp. 519-522 ◽  
Author(s):  
Guo Fu Xu ◽  
Zheng Dong Deng ◽  
Fei Fan Deng ◽  
Guo Bin Liu
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Dynamic Response ◽  
Buried Pipeline ◽  
Blast Loads ◽  
Buried Pipelines ◽  
Axis Direction ◽  
Ground Shock ◽  
Explosion Center

When the shock wave caused by explosion in geotechnical medium encountered buried pipeline, the buried pipeline may be destroyed. Use the LS-DYNA program to describe the deformation of buried pipelines under explosion ground shock. The results indicate that the process of the stress on pipe is instantaneous, and the back of buried pipelines against explosion center suffers greater instantaneous pulling stress in axis direction. The stress on the pipes, which is brought by the weaponary explosion, is involved with the distance between the pipe and explosion center and the diameter of pipe, among which the former involves greater. And the smaller pipe would get greater shock.

scholarly journals Experimental and numerical simulation on buried hot fuel oil pipelines in three modes flow regime considering temperature loss during a shutdown

2020 ◽  
pp. 345-345
Author(s):  
Mohsen Dehdarinejad ◽  
Morteza Behbahani-Nejad ◽  
Ebrahim Hajidavalloo
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Pour Point ◽  
Large Scale ◽  
Fuel Oil ◽  
Fluid Density ◽  
Temperature Dependent ◽  
Buried Pipelines ◽  
Temperature Loss ◽  
Oil Pipelines

Aiming to study the temperature distribution along buried pipelines containing hot fuel oil, a new large-scale laboratory is constructed from the perspective of the corresponding fluid thermophysical properties. Also, a modeling of the pipeline, and the soil around it, was performed along the pipeline for observation of all three modes of turbulent, laminarization, and laminar flow, which is validated by experimental results. Furthermore, the appropriate data are also gathered from the actual pipeline, 107 km of the 26? pipeline between Abadan Refinery and Mahshahr Port, and the results of the experiment and modeling are reconfirmed. The experiment shows that the viscosity and fluid density of fuel oil is strongly temperature-dependent. Many experiments are performed on the parameters affected by temperature according to their importance. The method chosen to simulate three flow modes along the pipeline shows less than 2% error in turbulent and laminar zones and reveals just a 3% error to experimental data in the laminar region. The maximum safe time during the stopping period of the pipeline (MSST) and holding fuel oil in it is calculated based on the pour point of fuel oil. This time is critical for the real pipeline in sudden shutdown and is calculated 41 hours.

Characteristics and effects of electromagnetic interference from UHVDC and geomagnetic storms on buried pipelines

2021 ◽  
Vol 125 ◽  
pp. 106494
Author(s):  
Hongzheng Liu ◽  
Qingquan Li ◽  
Haixia Li ◽  
Zhitong Xue ◽  
Mingming Han ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Geomagnetic Storms ◽  
Buried Pipelines

Corrosion Rates of Buried Pipelines Caused by Geomagnetic Storms

CORROSION ◽  
1999 ◽  
Vol 55 (7) ◽  
pp. 699-705 ◽  
Author(s):  
A. Osella ◽  
A. Favetto ◽  
E. López
Keyword(s):  
Geomagnetic Storms ◽  
Buried Pipelines ◽  
Corrosion Rates
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