Large Storage Tank Structure Design Cases-Based Teaching in Teaching Reform for Major of Oil&Gas Storage and Transportation Engineering

As one of the compulsory courses of oil and gas storage and transportation engineering,“Strength Design and Safety Management of Storage and Transportation Facilities”is a comprehensive course of both practicality and theory.In order to solve the unbalanced distribution of theoretical and applied content in the teaching process,the teaching team reformed the teaching mode of the structure design of large storage tanks in the course of“Strength Design and Safety Management of Storage and Transportation Facilities”and introduced case-based teaching.On the basis of the original course,practical engineering case analysis such as wind-induced buckling of large storage tank and uneven settlement of tank foundation was added,which increased the proportion of application content.It is a new type of discussion teaching integrating case collection,group discussion and afterclass experience exchange.According to the recent three years of teaching practice,students’interest in this course has increased greatly and teaching quality has improved significantly,which fully verified the feasibility of engineering case-based teaching in teaching reform.The teaching team has gradually improved the teaching process according to the relevant experience and lessons in classroom practice and made a successful attempt in the teaching reform of storage and transportation structure safety courses,which is of positive significance for training application-oriented composite talents with the ability to solve practical problems in the new era.

The Research Application of 3D Laser Scanning Technology in the Deformation Detection of Large Cylindrical Oil Tank

In order to ensure the safety in using a large cylindrical storage tank,it is necessary to regularly detect its defonnatioii.The traditional total station method has high accuracy in determining the deformation,however,it has a low measxirement efficiency.Long-term observation means,there are more risks in the petrochemical plant,therefore,this paper proposes the usage of the 3D laser scanner,replacing the traditional total station to determine the defbnnation of a large cylindrical storage tank.The Matlab program,is compiled to calculate the point cloud data,while the tank deformation is analyzed from two different points which are,the local concave convex degree and the ovality degree.It is concluded that,the difference between the data obtained by 3D laser scanning,and total station is within the range of oil tank deformation limit,therefore,3D laser scanner can be used for oil tank deformation detection.

Numerical simulation of stirred tanks using a hybrid immersed-boundary method

Conventionally, multiple reference frame(MRF) method and sliding mesh(SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary(IB)technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units(CPUs) and graphics processing units(GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation(LES). Finally the proposed methodology is coupled with discrete element method(DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries.

Wind‑resistant design theory and safety guarantee for large oil and gas storage tanks in coastal areas

Large oil and gas storage tanks serve as crucial industrial energy infrastructures,which are usually thin-walled steel structures with large volumes and light weights,and they are sensitive to wind loads.Under the influence of strong winds or typhoons,large oil and gas storage tanks may suffer wind-induced damage,resulting in the leak-age of gas or liquid inside the tanks,posing hazards to the ecological environment and public safety.Therefore,it is of great theoretical and engineering significance to research the wind resistance of large oil and gas storage tanks.This paper provides a comprehensive review of key issues in wind resistance for large oil and gas stor-age tanks,including characteristics of flow around circular cylinders,wind effects on structures with circular cross-sections,near-surface wind field characteristics,wind effects on large oil and gas storage tanks,wind-induced interference effects,struc-tural dynamic characteristics,wind loads and wind-induced response calculations,multiple load effects,and wind-induced vibration control.The deficiencies of current research are summarized.The prospects for research on the design theory and safety assurance of large oil and gas storage tanks are presented through various methods,including field measurements of near-surface wind fields and wind effects,wind tunnel tests utilizing aeroelastic models,numerical simulations involving fluid–solid coupling,theoretical analysis,and machine learning.