Application Analysis of Metal Membrane Coupling in the Low-temperature DL Vertical Centrifugal Pumps
0
Citation
0
Reference
20
Related Paper
Abstract:
Vertical low-temperature centrifugal pumps were introduced as well as structure and working principle of metal diaphragm coupling,common faults and cause analysis of vertical centrifugal pumps.The relation of vertical cryogenic pump common faults with the installation condition of the coupling was discussed.In the Turpan-Hami oilfield division hydrocarbon storage and work area,in order to increase and improve the loading capacity,the metal diaphragm coupling was used to replace the fixed coupling.After the transformation,application conditions and economic advantages were analyzed.The results show that the transformation can not only save maintenance time,but also significantly lower maintenance costs,and improve the operating efficiency of pump.Keywords:
Diaphragm (acoustics)
Fluid coupling
Cite
Based on the principle of centrifugal pump and the idea of compact design, an electric-motor-pump is developed. It is integrated by an electric motor, a hydraulic vane pump and a port-plate centrifugal pump as a compact hydraulic power unit. The vane pump is as the main pump of the unit. The port-plate centrifugal pump is designed specially for the main pump to improve the suction performance of the electric-motor-pump. The integrated pump demonstrates some attractive advantages such as more compact structure, lower noise, higher efficiency and no external leakage. By computational fluid dynamics (CFD) method, the effects of the main structural parameters of the port-plate centrifugal pump on its outlet pressure and the efficiency are investigated. The design rules for the port-plate centrifugal pump are concluded. The simulation results show that the port-plate centrifugal pump can raise the inlet pressure of the main pump obviously. When the slope angle of the eccentric tube is 45° and the bias angle is between 45°~60°, the maximum power consumption is only about 0.41% of the electric-motor-pump, which also shows that the port-plate centrifugal pump almost do not influences the whole power characteristics of the electric-motor-pump. Its efficiency can be above 95 percent, and the whole efficiency of the centrifugal pump including the outlet channel is 22%. Power loss occurs due to eddy flow from the outlet of the centrifugal pump to the outlet channel to the main pump.
Rotodynamic pump
Axial-flow pump
Axial piston pump
Cite
Citations (0)
Positive displacement meter
Water pumping
Rotodynamic pump
Piston (optics)
Axial piston pump
Submersible pump
Cite
Citations (5)
The centrifugal pump has been widely used in offshore platform because of its wide performance range, flow uniformity,simple structure,reliable transportation,relatively low sensitivity on the failure,easy maintenance and many other advantages.However,due to the sensitivity of Centrifugal Pump on NPSR,how to setect suitable pumps becomes very difficult,when pumping heat transmission medium or operating at low inlet pressure condition.In this paper,a series of solutions for NPSH is listed and the vertical barrel centrifugal pump is described in detail.
NPSH
Cite
Citations (0)
Rotodynamic pump
Circulating pump
Cite
Citations (0)
The head of the centrifugal pump at the zero-charge and low-charge conditions has direct influence on the pump startup. In this paper, a large-size single-suction and single-stage vertical centrifugal pump with medium-low specific speed, which used in the Ganhe pump-station of water transferring project from Niulan River to Dianchi Lake, was taken as the research target. The optimization on the basic design of impeller and guide vanes, was to study the pump's head characteristics of the low flow conditions, especially focused on improving the head on the low-flow conditions by using the hydraulic design with CFD method and finally to get the optimal matching between impeller and guide vanes. The study was verified by both the model pump tests and prototype pump test at zero-charge condition. The results show that, the head of the low-charge conditions converted according as the results of the model pump tests is higher than the head analyzed by CFD method, the head of the prototype pump at the zero-charge condition has sufficient margin and meets hydraulic design requirements.
Specific speed
Speedup
Cite
Citations (0)
Specific speed
Rotodynamic pump
Axial-flow pump
Hydraulic head
Volumetric efficiency
Cite
Citations (8)
Fluid coupling
Cite
Citations (1)
Centrifugal pumps using in ships have an evident vibration and noise in operation.It is improved on design and manufacture process of a certain type centrifugal pump using in ships for the sake of controlling the noise index,considering the factors which result in vibration and noise.The pump body is changed from single-shell into double-shells and the connection form of pump is changed from rigid connection into elastic connection.While the arrangement mode of the bearing is used in reason,the axial thrust of pump is supported by the pump rather than the electromotor.The pump is designed strengthening the baseboard,changed the weldments into foundry goods of the base and bracket and also improved on fabrication technology.Numerical simulation of interior flow in the improved pump and frequency analysis of the pump base structure are carried out and as well the vibration and noise experimentation of the pump in operation.From the experimentation results it can be concluded that the improved pump satisfies the requirements of the vibration and noise indices.
Axial-flow pump
Axial piston pump
Cite
Citations (0)
The structural and hydraulic design method is presented on low specific speed high speed centrifugal pump for hangling high temperature liquids.Theoretically optimum design is carried out with objective function of efficiency to achieve best efficiency,and structurally comlex impeller and combined seals are designed to achieve operating reliability.The experimental results and on spot operation show that the developed pump achieve perfect performance and sealing reliability.Figs 7,table 1 and refs 3.
Specific speed
Volumetric efficiency
Turbomachinery
Cite
Citations (0)
The rotating speed has an influence on the pump performance.The operating point of centrifugal pump is affected by the characteristics of both pumps pipelines.By changing the rotating speed of pump in both open and closed pipelines,together with experimental data and calculated results for 50-160 type pumps,the effects of power are studied in detail.The effects of energy saving of variable speed pumps in the closed circuit are different from those in the open pipeline system.The reason is that there is a static head in the open system causing the pump efficiency varying.The energy saving effects of variable speed pumps in open systems are discussed and calculation examples are provided.According to the calculated result of 50-160 type pumps,the pump power in closed system is 76.47% of that in open system.
Rotodynamic pump
Specific speed
Operating point
Cite
Citations (0)