Papers by Keyword: Pump

Abstract: The southern part of Malang Regency, particularly the coastal area, has experienced rapid development in tourism, infrastructure, and new settlements in recent years, which has impacted water availability. Clungup Mangrove Conservation (CMC) in Sendang Biru is one of the ecotourism sites facing water availability constraints, particularly for meeting the needs of public facilities in the CMC area. Various efforts have been made, but they have not been fully effective in providing clean water. This case study uses direct observation and clean water pipeline network modeling using EPANET 2.0 to identify the causes of clean water constraints in the CMC area. Based on observations and modeling, it was found that the flow rate in the distribution pipes is suboptimal due to differences in pipe diameters within the network. Additionally, the water source currently used is surface water from rivers, which contains sediment during the rainy season and affects pump performance. Therefore, the solutions proposed in this case study not only involve replacing pipe diameters but also optimizing the use of the Sendang Biru water source. This research is not purely theoretical but includes the implementation of solutions. Based on evaluations after implementation, the newly designed pipeline network operates effectively and produces the expected water flow.

Abstract: Shaft failures often occur, even in the shafts of centrifugal pumps. This study aims to determine the cause of shaft fracture through experimental and numerical study. The fracture surface was observed using Scanning Electron Microscopy (SEM) to identify the initial crack. The chemical composition test results show that the material used was in accordance with the AISI 420 standard, which is necessary to make Finite Element Analysis (FEA) modelling. Shear stress, strain and stress intensity factors were analysed around the fillet using FEA. The results show that the value of maximum stress intensity factor, K_I, occurs in the multilevel shaft fillets that experienced initial cracks due to torsional loads. The shear stress value, obtained from the FEA, was higher than the shear stress value of the material. The K_I value, also derived from the FEA, was higher than the K_IC value of the material.

Abstract: The paper focuses on the metallographic analysis of the damaged inner shaft of a centrifugal pump with a magnetic clutch. This pump was used for the pumping of viscous suspensions. The damaged part of the centrifugal pump was made of stainless steel and transmitted power from the magnetic clutch to the impeller of the pump. The pump was overhauled by the Manufacturer after ten years of routine work. Slightly worn parts of the pump, including the inner stainless steel shaft, were replaced by the Manufacturer according to the preserved documentation. The overhauled pump failed after two days of running in the original conditions. The problematic is solved by an analysis of three used inner shafts with the aid of a metallographic analysis of the microstructure of the material, using light microscopy and scanning electron microscopy, and an EDS microanalysis of the chemical composition and hardness measurements.

Abstract: The article analyses corrosive stock in an oil and gas field, and the protection method for the equipment in boreholes and in oil pipelines is discussed. Subsurface pumping equipment corrosion rate monitoring method has been improved. In an oil and gas field, the inhibitor is pumped into the oil pipeline directly into the oil-gathering line and into the production boreholes with different dosages. Pilot testing was carried out to optimize the corrosion inhibitor dosage.

Abstract: This paper deals with a comparative study of the outlet pressure-energy between a conventional and normal blade impeller and an airfoil-shaped blade impeller of a centrifugal pump. Although the volute casing is an important component along with an impeller [1], the present comparative analysis makes the volute casing redundant to the study, hence neglected. All centrifugal pumps are usually designed and manufactured using backward swept blades with equal camber on the top and bottom sides. An increased camber on the top side is an ideal trait for a lift generating airfoil. The purpose is to implement the principle of lift generation of airfoil for centrifugal pumps. As a result, a local suction side and pressure side can be visualized using CFX-post processor. The 3D analysis of such a centrifugal pump impeller is designed in SOLIDWORKS® and analyzed using ANSYS® CFX. The SST (Menter’s Shear Stress Transport) model is used as it combines both the k-ω and k-ε turbulence models.

Abstract: This article is focused on finding the most appropriate solution for eliminating vibrations that pose harmful influences in mechanical systems. To find this solution, the kinetic equations were generated from dynamical model of truck bodybuilding. The block diagram for natural frequencies calculation was made up out of these equations. Two solutions were suggested – to place flexible shaft coupling between high pressure pump and Power Take off and to connect the pump and Power Take Off directly with shaft. It is important to note that vibrations emerging may be reduced more effectively by using of the former solution – flexible shaft coupling.

Abstract: Groundwater source pumps are popular recently in worldwide. More and more pumps have been built in city. It is well known that the heat recharged to ground aquifer from refrigeration and air-conditioning in summer will migrate along with groundwater flow. So it is worthy to study the problem such as whether it impact on the safety of oil station. This paper presents a model which use simulation the heat of groundwater pump migrate process to study the impact on oil station downstream. Through simulation the heat field diffusion procedure and temperature change are obtained. Results show that the recharged heat issued from summer groundwater source pump will spread for a long distance to oil-station with downstream flow, the temperature around oil-station rise significant. The heat may influence the safety of storage tank and oil station.

Abstract: The rapid prototyping with ice is a new manufacturing technology that can generate three-dimensional objects from ice by depositing and rapidly freezing water layer by layer. In order to freeze the water droplets, the plate must meet certain conditions, among those it is worth to be mentioned, the surface temperature, which should not surpass 0°C. The equipment presented in the paper is a part of rapid freeze prototyping equipment, designed and built by the authors. The authors analysed various freezing systems and they discovered that the classical cooling systems are not appropriate to be used in rapid freeze prototyping technology. The unique solution is the utilisation of thermoelectric cells, generic named as Peltier cells. The modern technology can be used in obtaining Peltier cells, with a high degree of reliability, electrical consumption and yield. This can be successfully used as heat pumps in industry. The author developed an original system that permitted to implement the Peltier cells. The cold plate was designed by using CAD software. In addition, the cold plate was produced and tested. The equipment obtained, has a greater power in comparison with the classical ones, even if it has smaller dimensions. The electrical power supply has to be well filtered in order to generate a higher efficiency. Through the main advantages of the Peltier cells can be mentioned: no maintenance have to be performed as this type of cells have no moving parts, thus having a major advantage; no CFC or other consumables parts have to be used, thus proving to be more economical than other systems; the heat regulation can be performed easier compared with the classical systems offering a better control and precision; it can be used in severe environments where conventional cooling systems can fail, being successfully used in the presence of liquid nitrogen; it can perform in various positions and is reversible similar to heat pumps. The main drawback of this system is that it uses a great amount of electrical energy, consequently can have a low yield.

Abstract: The article reviews some questions regarding replaceable hydraulic parts (RHP) for pumps with spiral volute. A range of optimal pump parameters achievable using RHP is considered.

Abstract: The influence of pumping unit’s elements on the overall energyefficiency of its work is viewed in the article. The areas of pumping unit’s operation effectiveness are identified and evaluated within the field of his QH characteristics and efficiency of its use in real technological process. The methodology of pumping unit’s operation evaluation in different modes through indicators of unit electrical energy consumption is developed.