Asset Integrity of Gas Storage Sphere Legs Using Advanced Technologies

2021 ◽  
Author(s):  
Ankit Vajpayee
Keyword(s):  
Low Frequency ◽  
Mesh Size ◽  
Gas Storage ◽  
Wire Mesh ◽  
Advanced Technologies ◽  
Scanning Technique

Abstract The inspection of the steel legs that hold up gas storage spheres has been difficult because of the thickness of cement that is applied to the legs to make them "fireproof". The cement contains steel studs that are welded to the legs and wire mesh that may vary in mesh size, all of which complicate the inspection possibilities. A new, low frequency AC scanning technique has been developed which can detect corrosion under fireproofing (CUF). The technique and its industry-supported development is described.

Low Frequency Seismic Survey at a Gas Storage Reservoir

2011 ◽  
Author(s):  
M. Duclos ◽  
B. Artman ◽  
B. Birkelo ◽  
F. Huguet ◽  
J. F. Dutzer ◽  
...  
Keyword(s):  
Low Frequency ◽  
Gas Storage ◽  
Seismic Survey ◽  
Storage Reservoir

Friction Factor Determination for Flow Through Finite Wire-Mesh Woven-Screen Matrices

1997 ◽  
Vol 119 (4) ◽  
pp. 847-851 ◽  
Author(s):  
J. R. Sodre´ ◽  
J. A. R. Parise
Keyword(s):  
Cross Section ◽  
Circular Cross Section ◽  
Mesh Size ◽  
Packed Bed ◽  
Reynolds Numbers ◽  
Wire Mesh ◽  
Hydraulic Radius ◽  
Fully Developed Flow ◽  
Flow Through ◽  
Screen Mesh

Experiments were carried out to determine the pressure drop through an annular conduit filled with a plain square wire-mesh woven-screen matrix. The tests involved turbulent fully developed flow of air at steady-state conditions, with the modified Reynolds number (M(1−ε)/Re), based on the hydraulic radius of the packed bed, ranging from 5 × 10−4 to 5 × 10−3. The test section was built according to the geometry of a Stirling engine, simulating an annular regenerator with a radius ratio of 1.369 and a screen of mesh size 10. A corrected Ergun equation was used to correlate the experimental data, considering the wall effects. Comparisons with results obtained by other authors extended the validation of the correlation obtained to a wider range of modified Reynolds numbers (1 × 10−4 ≤ M(1 − ε)/Re ≤ 1) and to different screen mesh sizes. The correlation has been found to work for annular and circular cross-section beds.

Design of “SIREC-1” Wire Mesh Open Volumetric Solar Receiver Prototype

2001 ◽  
Author(s):  
Félix M. Téllez ◽  
Manuel Romero ◽  
María J. Marcos
Keyword(s):  
Development Program ◽  
Mesh Size ◽  
Computer Code ◽  
Operating Conditions ◽  
Wire Mesh ◽  
Test Facility ◽  
Receiver Design ◽  
Two Phases ◽  
Set Up ◽  
Solar Receiver

Abstract The paper describes the design and status of development of a new open volumetric air receiver prototype. This receiver design, though developed in two phases, constitutes one deliverable in a Spanish project carried out by CIEMAT, IAER and INABENSA. The project, called SIREC, is partially financed by the European Funds for the Regional Development program (FEDER). The receiver prototype is now in fabrication and will be tested in the Sulzer volumetric receiver test facility at the Plataforma Solar de Almería (PSA) in Spain. Testing is scheduled for April, 2001. The prototype design includes an air return system and modular absorber elements, to facilitate their replacement and reduce manufacturing costs. The absorber is wire mesh. A computer code has been set up to select the mesh size (wire diameter and mesh distance) and number of screens. A sensitivity analysis for a variety of operating conditions has been carried out with this code to guide the absorber design and its testing.

Adaptive Multigrid for Helmholtz Problems

2003 ◽  
Vol 11 (03) ◽  
pp. 341-350 ◽  
Author(s):  
Guido Bartsch ◽  
Christian Wulf
Keyword(s):  
Eigenvalue Problems ◽  
Low Frequency ◽  
Sound Field ◽  
Mesh Size ◽  
Adaptive Mesh ◽  
Error Norm ◽  
Discrete Eigenvalue ◽  
Solution Quality ◽  
Spatial Direction ◽  
Sound Fields

Solving Helmholtz problems for low frequency sound fields by a truncated modal basis approach is very efficient. The most time-consuming process is the calculation of the undamped modes. Using traditional FE solvers, the user has to provide a mesh which has at least six nodes per wavelength in each spatial direction to achieve acceptable results. Because the mesh size increases with the 3rd power of the highest frequency of interest, this uniform dense mesh approach is a very expensive way of creating a modal space. However, the number of modes and the accuracy of the modal basis directly influences the solution quality. It is well known that the representation of sound fields by modal basis functions φi is optimal with respect to the L2 error norm. This means that having a modal basis Φ := {φi, i = 1⋯n}, the distance between true and approximated sound field takes its minimum in the mean square. So, it is necessary to have a FE basis which also minimizes the discretization error when computing the modal basis. One can reach this goal by applying adaptive mesh refinements. Additionally, this yields the opportunity of using fast multigrid methods to solve discrete eigenvalue problems. In context of this presentation we will discuss the results of our adaptive multigrid algorithms.

An Experimental Study of Boiling Heat Transfer on Mesh-Covered Fins

2009 ◽  
Author(s):  
Liang-Han Chien ◽  
H.-L. Huang
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Mesh Size ◽  
Wire Mesh ◽  
Finned Tubes ◽  
Enhanced Tubes ◽  
Boiling Heat Transfer Coefficient ◽  
Fin Tube ◽  
Enhanced Boiling ◽  
Fin Tubes

This study investigates a new enhanced boiling surface, which is made by wrapping wire mesh on finned tubes. Pool boiling performance of the new enhanced tubes has been tested in Refrigerant-134a at 5, 10, 20, and 26.67°C saturation temperatures. Brass or copper mesh of 80, 100, or 120 meshes per inch was wrapped on finned tubes of 42 or 60 FPI (fins per inch). The fin heights were either 0.2 mm or 0.4 mm. The test results show that the mesh covered fin tubes significantly enhanced the boiling performance by forming many pores of proper sizes on the surface and sustaining vapor in the tunnels formed by the mesh and fins. The preferred mesh size decreases with decreasing heat flux. The mesh covered on 60FPI fin tube having 0.4 mm fin height and 100 mesh per inch yields the best boiling performance. It enhances the boiling heat transfer coefficient by 7∼8 folds at 5°C as compared with the smooth tube.

scholarly journals Effect of Light Intensities on Growth Performance of Tetrapleura tetraptera Seedlings Schum. (Thonn.)

2021 ◽  
Vol 25 (1) ◽  
pp. 93-97
Author(s):  
O.D. Ayeni ◽  
Q.A. Onilude ◽  
P.J. Adekola ◽  
B.M. Awosusi ◽  
N.C. Mba ◽  
...  
Keyword(s):  
Light Intensity ◽  
Plant Height ◽  
Mesh Size ◽  
Wire Mesh ◽  
Leaf Production ◽  
Mean Values ◽  
Light Intensities ◽  
Significant Difference ◽  
Tetrapleura Tetraptera ◽  
The Mean

The study assessed the effect of varying light intensities and optimum percentage of sunlight favourable for raising Tetrapleura tetraptera seedlings. The light intensity was measured through photometer. The experiment was subjected to a control without wire mesh(T1) and three other treatments (T2, T3 and T4) covered with different layers of black wire mesh with 99.5%, 75%, 49.8% and 25% light intensities respectively. Each of the treatments was replicated six times in a completely randomized design. The plant height, leaf production and stem diameter were all monitored for 12 weeks. Analysis of Variance (ANOVA) was employed and the means separated using Least Significant Difference (LSD). The results showed that the significance effect (P = α0.05) was only observed in the seedlings height of Tetrapleuratetrapteraseedlings. However, the mean values obtained for all the parameters considered revealed the treatment 1(i.e. 99.8% wire mesh) was observed to be the best performing treatment. For the plant height, mean value ranged between 13.09 cm and 16.8 cm, a range from 0.22cm to 0.28mm was recorded for stem girth while the mean values between 22 and 27 were obtained for number of leaves among the treatments. It may be concluded from the study, that light intensity of 100% i.e without interference should be used for the growth and development as well as production of Tetrapleura tetraptera seedlings in the nursery. Keywords: Growth development, light intensities, Tetraplura tetreptera seedlings, wire mesh size

scholarly journals The Influence of Finite Element Meshing Accuracy on a Welding Machine for Offshore Platform’S Modal Analysis

2018 ◽  
Vol 25 (s3) ◽  
pp. 147-153
Author(s):  
Jiuming Xie ◽  
Dengyue Sun ◽  
Chengying Xu ◽  
Jin Wu
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Mesh Refinement ◽  
Low Frequency ◽  
Mesh Size ◽  
Simulation Models ◽  
Element Analysis ◽  
Factors Affecting ◽  
Welding Machine ◽  
Finite Element Meshing

Abstract The purpose objective of this study was to investigate the influence of finite element meshing accuracy on modal analysis which is one of the basic factors affecting the accuracy of finite element analysis and mostly preoccupies the working staff in pre-processing finite element simulation models. In this paper, we established several finite element models of a welding machine for offshore platform, with the meshing accuracy as the variable and workbench software as the platform for modal analysis, as the same time, comparing the analysis results. The results indicated that for some specific structures and simulation types, mesh refinement alone does not achieve desired results, and the authors indicate that mesh refinement is rarely related to the equipment’s low-frequency modal analysis but it’s great related to the equipment’s high-frequency modal analysis. The findings of this study may serve as breaking the opinion that smaller mesh size means higher calculation precision and provides references for mesh division practices in low frequency modal analysis.

scholarly journals Nonlinear Vibration Analysis of Tubing Strings in Underground Gas Storage Using Multiscale Wavelet Transform

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Hang Yan ◽  
Yifei Yan ◽  
Xiangzhen Yan
Keyword(s):  
Wavelet Transform ◽  
Nonlinear Vibration ◽  
Vibration Analysis ◽  
Transient Flow ◽  
Gas Injection ◽  
Sudden Change ◽  
Low Frequency ◽  
Gas Storage ◽  
Underground Gas Storage ◽  
Injection Process

The tubing string exposed to transient flow may undergo nonlinear vibration due to sudden change in pressure in conveying gas. But, the drag on such structures often leads to fatigue failure of the strings that may significantly affect the vibrations through the combined effects of the first sections of gas injection, annulus pressure, the inclined structures, and the large transient flow component. In this paper, the nonlinear vibration analysis of tubing strings in underground gas storage using the multiscale wavelet transform has been studied. The vibration characteristics of strings in the steady gas injection process have been analyzed by numerical simulation. Results of the calculation model are compared to numerical ones reported previously, and the excellent agreement is obtained. The nonlinear vibration experiment of strings in the gas injection process has been studied for discussing the change rules of the string pressure, the wall velocity, and the amplitude in the gas injection process. The results show that the near-injection port section and the inclined section of strings are the high-incidence areas of nonlinear vibration of strings in underground gas storage. We also find that significant alteration of the dynamics is due to low-frequency pressure fluctuation forces on the tubing strings.

Experimental Investigations on the Premixed Flames Stabilized on Wire Mesh Materials

2008 ◽  
Author(s):  
H. S. Lee ◽  
Paul L. Senn ◽  
Kevin M. Field ◽  
Charles W. Adams
Keyword(s):  
Pressure Drop ◽  
Premixed Flames ◽  
Combustion Process ◽  
Mesh Size ◽  
Linear Increase ◽  
Wire Mesh ◽  
Experimental Investigations ◽  
Excessive Heat ◽  
Firing Rates ◽  
Surface Temperatures

Experiments were performed to identify the combustion characteristics of the premixed flames stabilized on the Inconel and Kanthal wire woven mesh materials. NOx emissions linearly increased at lower firing rates, followed by a rapid increase at higher firing rates. At the lower firing rates, the prompt NOx mechanism was the major route, and the thermal NOx formation became dominant at the higher firing rates due to an increase in gas temperatures. The CO concentrations generally decreased to reach the minimum and increased again with firing rates. The wire surface temperatures rapidly increased at lower firing rates, suggesting that the heat generated from the combustion process was effectively dissipated from the materials by radiation. The gradual, linear increase in the surface temperatures at higher firing rates supported that the flame was detached from the materials due to excessive heat from combustion. These behaviors of the flame were thought to be responsible for the trends of the CO and NOx formations. The pressure drop in the material was dominated by the mesh size, which determined the velocity of unburned mixture, rather than the material properties. The coefficients of the Forchheimer equation were deduced from the measured pressure drop. The Inconel 24×24 and 26×26 meshes showed the best performance in the materials tested, in terms of the NOx and CO emissions and pressure drop.

scholarly journals Performance of Retrofitted Square Reinforced Concrete Column using Wire Mesh and SCC Subjected to Cyclic Load

2021 ◽  
Vol 7 (4) ◽  
pp. 720-729
Author(s):  
Hence M. Wuaten ◽  
Herman Parung ◽  
A. Arwin Amiruddin ◽  
Rita Irmawaty
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Load ◽  
Control Method ◽  
Plastic Hinge ◽  
Mesh Size ◽  
Wire Mesh ◽  
Reinforced Concrete Column ◽  
Entire Cross Section ◽  
Control Column ◽  
Displacement Control Method

One way to restore or increase the strength of the structure against earthquakes is to use retrofit method and wire mesh is a material that has high prospects as retrofit material. The purpose of this study was to examine the use of wire mesh as a retrofit material on reinforced concrete columns burdened with cyclic loads. In this study, testing of 3 square column samples of reinforced concrete with dimensions of 300  300 mm. The first specimen is fully retrofit on the entire cross-section of the column, the second specimen is retrofitted on the plastic hinge area of the column and the third specimen is a control column without retrofit. In the first and second specimens were retrofitted with wire mesh size M6 using SCC which was then tested with a cyclic load using displacement control method based on the provisions stipulated in the Indonesian Standard SNI 7834:2012. From the test results and analysis results, it was found that the capacity and ductility of displacement in retrofit specimens increased significantly compared to specimens that were not retrofit. In addition, the decrease in stiffness in retrofit specimens was smaller than in non-retrofit specimens. As for the value of energy dissipation in fully retrofit specimens and in retrofit on the plastic hinge area is almost close. Based on these conditions, the use of wire mesh size M6 and SCC can be used as retrofit material on the column that is burdened with cyclic load. Doi: 10.28991/cej-2021-03091685 Full Text: PDF

Sign in / Sign up

Export Citation Format

Share Document