In many civil engineering construction processes, the concrete pump pipe is more and more applicable scope and use scenarios. With the continuous improvement of the quality of concrete pump pipe and the expansion of t...In many civil engineering construction processes, the concrete pump pipe is more and more applicable scope and use scenarios. With the continuous improvement of the quality of concrete pump pipe and the expansion of the type of concrete pump pipe, now in the process of civil engineering construction, the application of concrete pump pipe is increasingly widespread. Pump pipe is one of the important equipment in engineering construction, its role is to transport mixed concrete, pump pipe is particularly important in high-rise buildings, can save labor, while improving the efficiency of engineering building brick. However, when pumping concrete, the pump pipe will produce strong vibration, which may lead to pump pipe rupture and support system instability collapse accident, resulting in casualties, and it is easy to destroy the cross-section size of the formwork and cause the location of the structural reinforcement to deviate, thus affecting the quality of concrete forming. For this purpose, the pump pipe needs to be fixed. The existing fixing method is to reinforce the pump pipe through the well-shaped scaffold, which is mostly rigid structure, and the impact force produced by the pump pipe in the pumping process is easy to damage the pump pipe. Based on the above situation, this paper conducts an experimental study on the impulse force generated by concrete pump pipe in the actual construction process of civil engineering and construction.展开更多
As one of the countries that use the most concrete in the world, the development of concrete industry plays an important role in promoting the economic development of our country. Therefore, the actual operation of ea...As one of the countries that use the most concrete in the world, the development of concrete industry plays an important role in promoting the economic development of our country. Therefore, the actual operation of each concrete enterprise should be paid sufficient attention to. If the actual effect of concrete enterprises can be truly brought into full play, it will have an important impact on promoting the promotion of China's comprehensive national strength. But in the development process of concrete enterprises, they often have a great impact on the natural environment. Because the concrete enterprise is a very consumption of water resources industry. In the concrete pump pipe cleaning process, it will produce a large number of waste water waste residue, these waste water and waste residue will not only produce huge pollution to the surrounding residents of water resources, but also cause a great waste of water resources. At the same time, the production of a large number of industrial waste water will also have a bad effect on the development of concrete enterprises.展开更多
Concrete pump pipe pulse force fixed device is one of the important equipment in engineering construction. Its role is to transport mixed concrete. Concrete pump pipe pulse force fixed device is particularly important...Concrete pump pipe pulse force fixed device is one of the important equipment in engineering construction. Its role is to transport mixed concrete. Concrete pump pipe pulse force fixed device is particularly important in high-rise buildings, because it can save labors, and improve the production efficiency of engineering construction. However, when pumping concrete, the pump pipe will produce strong impulse impact force, which may lead to pump pipe rupture and support system instability collapse accident, resulting in casualties, and it is easy to destroy the cross-section size of the formwork and cause the deviation of the position of the structural reinforcement, affecting the quality of concrete, thereby endangering the safety of the structure. For this purpose, the pump pipe needs to be fixed. The existing fixing method is to reinforce the pump pipe through the well-shaped scaffold, which is mostly rigid structure, and the impact force produced by the pump pipe in the pumping process is easy to damage the pump pipe. Based on the above research, this paper explores the invention of a reusable pulse force fixing device for concrete pump pipe, hoping to be helpful to other workers in the concrete industry.展开更多
A study on the character of pressure wave propagation was proposed for the gas liquid oxygen two-phase flow in the pipe between pumps.According to the practical working conditions,the homogenous model based on the com...A study on the character of pressure wave propagation was proposed for the gas liquid oxygen two-phase flow in the pipe between pumps.According to the practical working conditions,the homogenous model based on the compressibility theory regarding a single bubble in an infinite liquid,and Redlich-Kwong gas equation was derived a model for the low temperature and high pressure case,especially considering the change of the ratio of density of gas to one of liquid.The numerical tests were conducted.The results not only show the agreement between numerical simulation for this model and experiment at the normal temperature and pressure is good,but also show that the modifications of the model for the low temperature and high pressure condition are necessary.The study is of reference to further study of oscillation restrain and relative pipe tests.展开更多
This paper uses FLUENT software building the three-dimensional unsteady state model of ground source heat pump single U and double U underground pipe to study on heat exchange of underground pipe system in the conditi...This paper uses FLUENT software building the three-dimensional unsteady state model of ground source heat pump single U and double U underground pipe to study on heat exchange of underground pipe system in the condition of unsteady state long-term continuous running, analyzes the change of soil temperature filed around underground pipe and performance of underground pipe heat exchange between single U and double U pipe system. The results show that double U pipe system is better than single U system, which can improve unit depth heat exchange efficiency, reduce the number of wells and reduce the initial investment.展开更多
This paper presents the applications of vibration monitoring and a diagnosis technique on the predictive maintenance of pipe line pumps on offshore platforms. The monitored ten pumps are distributed on the past three...This paper presents the applications of vibration monitoring and a diagnosis technique on the predictive maintenance of pipe line pumps on offshore platforms. The monitored ten pumps are distributed on the past three petroleum platforms of the CACT (C: China offshove Southern; A: Agip; C: Chivron; T: Texaco) Operation Group in the Huizhou oil field. By the periodical vibration survey in recent three years, the typical faults and the vibration features of these pumps have been summarized, which set up the basis for efficient predictive maintenance of this key equipment offshore.展开更多
Water hammer occurs whenever the fluid velocity in vertical lifting pipe systems for deep-sea mining suddenly changes. In this work, the shock wave was proven to play an important role in changing pressures and period...Water hammer occurs whenever the fluid velocity in vertical lifting pipe systems for deep-sea mining suddenly changes. In this work, the shock wave was proven to play an important role in changing pressures and periods, and mathematical and numerical modeling technology was presented for simulated transient pressure in the abnormal pump operation. As volume concentrations were taken into account of shock wave speed, the experiment results about the pressure-time history, discharge-time history and period for the lifting pipe system showed that： as its concentrations rose up, the maximum transient pressure went down, so did its discharges; when its volume concentrations increased gradually, the period numbers of pressure decay were getting less and less, and the corresponding shock wave speed decreased. These results have highly coincided with simulation results. The conclusions are important to design lifting transporting system to prevent water hammer in order to avoid potentially devastating consequences, such as damage to components and equipment and risks to personnel.展开更多
The objective of present work is to find out the sources of fluid-borne noise in vertical inline pump for various flow rates. The three-dimensional unsteady Reynolds Average Navier Stokes equation was solved using com...The objective of present work is to find out the sources of fluid-borne noise in vertical inline pump for various flow rates. The three-dimensional unsteady Reynolds Average Navier Stokes equation was solved using computational fluid dynamics code to predict the acoustic distribution. The pump chosen for study was of low specific speed and the experimental performance characteristic was very well matched with computational head developed. PROUDMAN sound power contour analysis showed the critical zone of noise in inlet pipe,impeller,and volute. Based on this,the variations of acoustic power were depicted over the cross section of inlet pipe,along the mean streamline of inlet pipe,as well along the volute circumference. The result concludes that the predominant flow noise is at tongue region and followed by noise generated due to turbulence in inlet pipe which occurs by the sudden variation in flow passage as well it depends on the operating condition of pump. The frequency analysis gives a glimpse of understanding about the broadband noise distribution due to flow phenomenon over a frequency range.展开更多
With net zero carbon emissions targets approaching over the next 20 to 30 years, the water industry must act now to develop energy efficient techniques and designs to reduce emissions and reduce the carbon footprint o...With net zero carbon emissions targets approaching over the next 20 to 30 years, the water industry must act now to develop energy efficient techniques and designs to reduce emissions and reduce the carbon footprint of water utility providers. There is also the potential for significant energy and therefore financial savings to be realised from the adoption of more energy efficient designs approaches. Water utility providers account for a significant proportion of national electricity consumption. The purpose of this research is to determine if, over the long term, opting for a larger diameter pipe at design stage can lead to significant financial and emissions savings for water utility providers when considering pumping mains. Pumping mains are widely used throughout the water and wastewater industry where a gravity solution is not possible. 72 hypothetical water main design scenarios were analysed and the long term financial and environmental impact of each hypothetical water main was assessed. It was found across all design scenarios that larger diameter water mains were capable of delivering the same rate of flow of smaller diameter pipes at a much reduced velocity and requiring reduced pumping power. It was concluded that pumped mains of larger diameters can ultimately be more energy efficient and cost effective over the long term when selected in favour of smaller diameter pumped mains in otherwise identical design scenarios.展开更多
文摘In many civil engineering construction processes, the concrete pump pipe is more and more applicable scope and use scenarios. With the continuous improvement of the quality of concrete pump pipe and the expansion of the type of concrete pump pipe, now in the process of civil engineering construction, the application of concrete pump pipe is increasingly widespread. Pump pipe is one of the important equipment in engineering construction, its role is to transport mixed concrete, pump pipe is particularly important in high-rise buildings, can save labor, while improving the efficiency of engineering building brick. However, when pumping concrete, the pump pipe will produce strong vibration, which may lead to pump pipe rupture and support system instability collapse accident, resulting in casualties, and it is easy to destroy the cross-section size of the formwork and cause the location of the structural reinforcement to deviate, thus affecting the quality of concrete forming. For this purpose, the pump pipe needs to be fixed. The existing fixing method is to reinforce the pump pipe through the well-shaped scaffold, which is mostly rigid structure, and the impact force produced by the pump pipe in the pumping process is easy to damage the pump pipe. Based on the above situation, this paper conducts an experimental study on the impulse force generated by concrete pump pipe in the actual construction process of civil engineering and construction.
文摘As one of the countries that use the most concrete in the world, the development of concrete industry plays an important role in promoting the economic development of our country. Therefore, the actual operation of each concrete enterprise should be paid sufficient attention to. If the actual effect of concrete enterprises can be truly brought into full play, it will have an important impact on promoting the promotion of China's comprehensive national strength. But in the development process of concrete enterprises, they often have a great impact on the natural environment. Because the concrete enterprise is a very consumption of water resources industry. In the concrete pump pipe cleaning process, it will produce a large number of waste water waste residue, these waste water and waste residue will not only produce huge pollution to the surrounding residents of water resources, but also cause a great waste of water resources. At the same time, the production of a large number of industrial waste water will also have a bad effect on the development of concrete enterprises.
文摘Concrete pump pipe pulse force fixed device is one of the important equipment in engineering construction. Its role is to transport mixed concrete. Concrete pump pipe pulse force fixed device is particularly important in high-rise buildings, because it can save labors, and improve the production efficiency of engineering construction. However, when pumping concrete, the pump pipe will produce strong impulse impact force, which may lead to pump pipe rupture and support system instability collapse accident, resulting in casualties, and it is easy to destroy the cross-section size of the formwork and cause the deviation of the position of the structural reinforcement, affecting the quality of concrete, thereby endangering the safety of the structure. For this purpose, the pump pipe needs to be fixed. The existing fixing method is to reinforce the pump pipe through the well-shaped scaffold, which is mostly rigid structure, and the impact force produced by the pump pipe in the pumping process is easy to damage the pump pipe. Based on the above research, this paper explores the invention of a reusable pulse force fixing device for concrete pump pipe, hoping to be helpful to other workers in the concrete industry.
文摘A study on the character of pressure wave propagation was proposed for the gas liquid oxygen two-phase flow in the pipe between pumps.According to the practical working conditions,the homogenous model based on the compressibility theory regarding a single bubble in an infinite liquid,and Redlich-Kwong gas equation was derived a model for the low temperature and high pressure case,especially considering the change of the ratio of density of gas to one of liquid.The numerical tests were conducted.The results not only show the agreement between numerical simulation for this model and experiment at the normal temperature and pressure is good,but also show that the modifications of the model for the low temperature and high pressure condition are necessary.The study is of reference to further study of oscillation restrain and relative pipe tests.
文摘This paper uses FLUENT software building the three-dimensional unsteady state model of ground source heat pump single U and double U underground pipe to study on heat exchange of underground pipe system in the condition of unsteady state long-term continuous running, analyzes the change of soil temperature filed around underground pipe and performance of underground pipe heat exchange between single U and double U pipe system. The results show that double U pipe system is better than single U system, which can improve unit depth heat exchange efficiency, reduce the number of wells and reduce the initial investment.
文摘This paper presents the applications of vibration monitoring and a diagnosis technique on the predictive maintenance of pipe line pumps on offshore platforms. The monitored ten pumps are distributed on the past three petroleum platforms of the CACT (C: China offshove Southern; A: Agip; C: Chivron; T: Texaco) Operation Group in the Huizhou oil field. By the periodical vibration survey in recent three years, the typical faults and the vibration features of these pumps have been summarized, which set up the basis for efficient predictive maintenance of this key equipment offshore.
基金supported by the National Natural Science Foundation of China(Grant No.50875081)China Postdoctoral Science Foundation(Grant No.20080440992)+1 种基金the Planned Science and Technology Support Project of Hunan Province(Grant No.2009SK3159)Graduate Innovation Fund of Hunan University of Science and Technology(Grant No.S100109)
文摘Water hammer occurs whenever the fluid velocity in vertical lifting pipe systems for deep-sea mining suddenly changes. In this work, the shock wave was proven to play an important role in changing pressures and periods, and mathematical and numerical modeling technology was presented for simulated transient pressure in the abnormal pump operation. As volume concentrations were taken into account of shock wave speed, the experiment results about the pressure-time history, discharge-time history and period for the lifting pipe system showed that： as its concentrations rose up, the maximum transient pressure went down, so did its discharges; when its volume concentrations increased gradually, the period numbers of pressure decay were getting less and less, and the corresponding shock wave speed decreased. These results have highly coincided with simulation results. The conclusions are important to design lifting transporting system to prevent water hammer in order to avoid potentially devastating consequences, such as damage to components and equipment and risks to personnel.
基金State Key Program of National Natural Science Foundation of China(51239005)
文摘The objective of present work is to find out the sources of fluid-borne noise in vertical inline pump for various flow rates. The three-dimensional unsteady Reynolds Average Navier Stokes equation was solved using computational fluid dynamics code to predict the acoustic distribution. The pump chosen for study was of low specific speed and the experimental performance characteristic was very well matched with computational head developed. PROUDMAN sound power contour analysis showed the critical zone of noise in inlet pipe,impeller,and volute. Based on this,the variations of acoustic power were depicted over the cross section of inlet pipe,along the mean streamline of inlet pipe,as well along the volute circumference. The result concludes that the predominant flow noise is at tongue region and followed by noise generated due to turbulence in inlet pipe which occurs by the sudden variation in flow passage as well it depends on the operating condition of pump. The frequency analysis gives a glimpse of understanding about the broadband noise distribution due to flow phenomenon over a frequency range.
文摘With net zero carbon emissions targets approaching over the next 20 to 30 years, the water industry must act now to develop energy efficient techniques and designs to reduce emissions and reduce the carbon footprint of water utility providers. There is also the potential for significant energy and therefore financial savings to be realised from the adoption of more energy efficient designs approaches. Water utility providers account for a significant proportion of national electricity consumption. The purpose of this research is to determine if, over the long term, opting for a larger diameter pipe at design stage can lead to significant financial and emissions savings for water utility providers when considering pumping mains. Pumping mains are widely used throughout the water and wastewater industry where a gravity solution is not possible. 72 hypothetical water main design scenarios were analysed and the long term financial and environmental impact of each hypothetical water main was assessed. It was found across all design scenarios that larger diameter water mains were capable of delivering the same rate of flow of smaller diameter pipes at a much reduced velocity and requiring reduced pumping power. It was concluded that pumped mains of larger diameters can ultimately be more energy efficient and cost effective over the long term when selected in favour of smaller diameter pumped mains in otherwise identical design scenarios.
