A set of non-destructive testing methods used for diagnosing the foundations of pumping units

2020 ◽  
Vol 10 (2) ◽  
pp. 164-172
Author(s):  
Leonid Yu. Mogilner ◽  
◽  
Oleg A. Pridein ◽  
Eugeny Y. Sergeevtsev ◽  
◽  
...  
Keyword(s):  
Concrete Strength ◽  
Protective Layer ◽  
Technical Documentation ◽  
Destructive Testing ◽  
Existing Structures ◽  
Pumping Unit ◽  
Spatial Displacements ◽  
Diagnostic Work ◽  
Pumping Equipment ◽  
Pumping Units

Technical re-equipment of oil pumping stations often involves changing the power and weight of pumping equipment. In this regard, it is important to assess whether the replacement of a pumping unit foundation is feasible and, namely, whether the further use of existing facilities is possible, since the costs of replacing the foundations often exceed the costs of adapting existing structures to new equipment. The authors have developed a technology for examining pumping unit foundations to determine the possibility of increasing the load while replacing the equipment. Previously, no such survey has been conducted. The article presents the composition of the recommended diagnostic work, while describing the specifics and limitations of the methods used with some survey results given regarding more than 100 pump foundations. The average age of the samples was 44.9 years. As a result of geodetic measurements, the tilt and settlement values of the foundations were actually found to be free of changes over recent decades and complied with modern regulatory requirements, while the results of engineering and geological surveys have confirmed no serious risks of spatial displacements occurred. It was determined that during diagnostics it is necessary to control the following parameters: the existence of foundation waterproofing, concrete protective layer status, concrete strength and reinforced metal hardness, and whether the location of the reinforcement bars complies with the requirements of the design and/or regulatory and technical documentation. It is also necessary to make sure that there are no unacceptable corrosion damages to metal structures, with fastening and anchor bolt sizes being in compliance with the design and/or regulatory and technical documentation. The data on detected defects of various types are given taking into account the operating period and conditions of the foundations.

scholarly journals Research Concerning the Optimization of the Mechanism of the Conventional Sucker Rod Pumping Units

2019 ◽  
Vol 70 (5) ◽  
pp. 1795-1799
Author(s):  
Georgeta Toma
Keyword(s):  
Dynamic Analysis ◽  
Operating Parameters ◽  
Optimal Solutions ◽  
Structural Elements ◽  
Sucker Rod ◽  
Pumping Unit ◽  
Pumping Equipment ◽  
Pumping Units

Finding optimal solutions to design the mechanism of the conventional sucker rod pumping units is always present due to many problems that involve. The study in this case involves both the cinematic and dynamic analysis of the mechanism of the conventional pumping units, making sure that the optimization solution maintain unchanged certain operating parameters of the pumping equipment such as the stroke of the sucker rod column. In the paper is presented a method of determining the optimal dimensions of the structural elements of the mechanism of the conventional pumping units in order to reduce the maximum values of the connection forces in the bearings in the conditions of maintaining unchanged the stroke of the sucker rod column. The simulations have been performed in the case of a C-640D-305-120 pumping unit.

Assessment of Timber Structures Using the X-Ray Technology

2013 ◽  
Vol 778 ◽  
pp. 321-327 ◽  
Author(s):  
Steffen Franke ◽  
Bettina Franke ◽  
Florian Scharmacher
Keyword(s):  
Assessment Method ◽  
Normal Function ◽  
Structural Timber ◽  
Timber Structures ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
X Ray ◽  
Existing Structures ◽  
Effective Assessment ◽  
Non Destructive

The assessment of timber structures is a permanent task to check the normal function of individual structural timber elements. Non-destructive testing methods are preferred but the value of the information is limited due to the performance of the applied assessment method. However, X-ray is a technology which allows a view into the structural member or the connections. The mobile X-ray technology has been used in laboratory tests and practical situations at existing structures and led to excellent results which allowed detailed analyses. The method and its possibilities for non-destructive testing of timber structures will be presented. The results reached show a high potential for an effective assessment of existing structures including connections and structural timber members.

scholarly journals Assessment of Timber Roof Structures before and after Earthquakes

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 528
Author(s):  
Nikola Perković ◽  
Mislav Stepinac ◽  
Vlatka Rajčić ◽  
Jure Barbalić
Keyword(s):  
Test Methods ◽  
Timber Structures ◽  
Destructive Testing ◽  
Policy Makers ◽  
Load Bearing ◽  
Existing Structures ◽  
Roof Structure ◽  
Before And After ◽  
Timber Roof Structures ◽  
Non Destructive

The global objective of sustainable development has been greatly directed toward the preservation of existing structures. Therefore, condition assessment and reconstruction of existing timber structures have been gaining importance in recent times. This is particularly evident on timber roofs whose elements are exposed to degradation, either because of rheological effects or due to the direct influence of moisture and biological factors. In case of accidental events, such as an earthquake, the question of the structure’s condition is essential for the condition of the entire building. In order to prove the load-bearing capacity and serviceability of existing structures, as well as to check the need for reconstruction, it is necessary to define crucial parameters that are influencing the condition of materials, elements, and systems. Although there are many non destructive testing methods, the frequency and scope of their use, as well as the decision-making approach, have not been defined. In the paper, non-destructive and semi-destructive methods frequently used for timber structures are explained. A systematic review of criteria to be used in the assessment of load-bearing timber structures in a seismic active area was the main objective of this paper as well as the illustration of non-destructive and semi-destructive test methods through a case study involving roof construction of a hundred-year-old building in Zagreb, Croatia. Pre- and post-earthquake inspection was made. The overall condition of the roof structure after two significant earthquakes can be assessed as satisfactory given that the observed system is a large-span and massive roof structure. The presented results and identification of typical damages after the earthquake are presented in order to facilitate policy makers and for the future implementation of development strategies in the renovation of the city.

scholarly journals Improving the Efficiency of Gas Pumping Units: Problems and Solutions

2019 ◽  
pp. 104-118
Author(s):  
E.M. Komarov ◽  
Zh.M. Kokueva
Keyword(s):  
Gas Turbine ◽  
Problems And Solutions ◽  
Pumping Unit ◽  
Gas Pumping ◽  
Gas Pumping Unit ◽  
Pumping Units ◽  
Turbine Drive

The paper describes the process of initiating a project to improve the efficiency of gas turbine plants for driving centrifugal superchargers at compressor stations. The study shows the main trends of increasing the efficiency of gas turbine drives of gas pumping units, gives the constructive-functional appearance of the modern gas turbine drive of the gas pumping unit, and proposes a method for increasing its efficiency.

scholarly journals Estimation of In-situ concrete strength using drilling resistance

2019 ◽  
Vol 289 ◽  
pp. 06001
Author(s):  
Serkan Karatosun ◽  
Muhammet Asan ◽  
Oguz Gunes
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Condition Assessment ◽  
Assessment Practice ◽  
Destructive Testing ◽  
Seismic Safety ◽  
Concrete Mixtures ◽  
Priority Task ◽  
Compressive Strength Of Concrete ◽  
Drilling Resistance

Rapid and reliable condition assessment of reinforced concrete structures in high seismicity regions is a priority task in estimating their seismic safety. Non-destructive testing (NDT) methods may contribute to the condition assessment practice by providing fast and reliable strength estimation while causing minimal or no damage to the structure. Drilling resistance is an NDT method that has been used for mechanical characterization of natural stone and wood by measuring the force response for constant penetration rate and rotational speed. This paper focuses on the relationship between drilling resistance and compressive strength of concrete, including when it is combined with other NDT methods. Concrete cube samples produced using 6 different concrete mixtures were tested. Correlation equations were then obtained using statistical analysis. The results reveal that it may be possible to reliably estimate the compressive strength of concrete using drilling resistance method.

scholarly journals The Structural Diagnosis of Existing RC Buildings: The Role of Nondestructive Tests in the Case of Low Concrete Strength

2020 ◽  
Vol 5 (11) ◽  
pp. 100
Author(s):  
Silvia Santini ◽  
Angelo Forte ◽  
Lorena Sguerri
Keyword(s):  
Mechanical Properties ◽  
Concrete Strength ◽  
High Strength ◽  
Ultrasonic Pulse ◽  
Assessment Process ◽  
Structural Safety ◽  
Existing Structures ◽  
Nondestructive Tests ◽  
Compression Properties ◽  
Pull Out

In the structural safety assessment process of existing structures, knowledge of the mechanical properties of the materials is key. Different experimental activities carried out on materials extracted from existing reinforced concrete buildings show a high strength variability, especially concrete. In the past, the lack of standardized quality control for materials and workmanship caused nonuniform and homogeneous properties within the same structure. The most accurate and reliable experimental technique consists of performing direct tests on the materials, but these are considerably expensive and invasive. In this paper, alternative indirect methods that estimate material properties by correlating different physical measures were proved to reduce invasive inspections on existing buildings and infrastructures, especially in built heritage. A complete experimental activity concerning destructive and nondestructive tests was conducted on elements (four portions of a column and a beam portion) removed from an Italian school building built in 1940. Destructive and nondestructive methods were compared and appropriate correlation laws developed to predict the main mechanical properties of the studied material. Reliable correlations were identified considering the pull-out test, Sonic–Rebound (SonReb) combined method and ultrasonic pulse velocities (UPVs). The latter were mapped by tomography, which highlighted the compression properties of concrete in the different structural sections.

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