Centrifugal Pumps and Allied Machinery

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Think pump selection is an complex exercise? The addition of splitter blades on the outer side of the impeller with 0. The best efficiency point of water flow rate pump Qbep was 3. Prediction of centrifugal pump -cleaning ability in waste sludge. Radioactive waste at the Savannah River Plant SRP is being transferred from older waste tanks to new, stress-relieved tanks for more effective waste management.

The technology developed for waste removal involves the use of long-shaft, recirculating, centrifugal pumps slurry pumps. Testing completed at the Savannah River Laboratory's meter-diameter mock-up waste tank related the effective cleaning radius ECR of a slurry pump to critical pump and materials characteristics.

Presently, this theory is being applied to radioactive waste at SRP. However, the technology can be applied to other remote handling situations where the slurry rheology can be determined. Using this relationship, the cleaning performance of a pump operating in any SRP sludge environment can be predicted.

Specifically, yield stress and density measurements on sludge samples can be used to predict the required number and effective location for slurry pumps in actual SRP waste tanks. An implantable centrifugal blood pump for long term circulatory support. A compact centrifugal blood pump was developed as an implantable left ventricular assist system. The impeller diameter is 40 mm and the pump dimensions are 55 x 64 mm. This first prototype was fabricated from titanium alloy, resulting in a pump weight of g including a brushless DC motor.

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Weight of the second prototype pump was reduced to g. The entire blood contacting surface is coated with diamond like carbon to improve blood compatibility. A newly designed mechanical seal with a recirculating purge system "Cool-Seal" is used as a shaft seal. In this seal system, seal temperature is kept under 40 degrees C to prevent heat denaturation of blood proteins. Purge fluid also cools the pump motor coil and journal bearing. The purge fluid is continuously purified and sterilized by an ultrafiltration filter incorporated into the paracorporeal drive console.

In vivo experiments are currently ongoing using calves.

9:00 PM - RRB JE 2019 - Mechanical Engg by Neeraj Sir - Centrifugal Pump

Via left thoracotomy, left ventricular apex-descending aorta bypass was performed utilizing a PTFE Polytetrafluoroethylene vascular graft, with the pump placed in the left thoracic cavity. All plasma free hemoglobin levels were measured at pump function. In vivo evaluation of centrifugal blood pump for cardiopulmonary bypass-Spiral Pump. The SP is a disposable pump with an internal rotor-a conically shaped fuse with double entrance threads. This rotor is supported by two ball bearings, attached to a stainless steel shaft fixed to the housing base.

Worm gears provide axial motion to the blood column, and the rotational motion of the conically shaped impeller generates a centrifugal pumping effect, improving pump efficiency without increasing hemolysis. In vitro tests were performed to evaluate the SP's hydrodynamic performance, and in vivo experiments were performed to evaluate hemodynamic impact during usual CPB. A commercially available centrifugal blood pump was used as reference. In vivo experiments were conducted in six male pigs weighing between 60 and 90 kg, placed on CPB for 6 h each.

Values of blood pressure, mean flow, pump rotational speed, and corporeal temperature were recorded.

Also, ergonomic conditions were recorded: presence of noise, difficulty in removing air bubbles, trouble in installing the pump in the drive module console , and difficulties in mounting the CPB circuit. Comparing the laboratory and hemolysis results for the SP with those of the reference pump , we can conclude that there is no significant difference between the two devices. In addition, reports made by medical staff and perfusionists described a close similarity between the two devices.

During in vivo experiments, the SP maintained blood flow and pressure at physiological levels, consistent with those applied in cardiac surgery with CPB, without presenting any malfunction. Also, the SP needed lower rotational. The article deals with the effect of a bearing housing on rotor dynamics of a barrel casing centrifugal boiler feed pump rotor. The calculation of the rotor model including the bearing housing has been performed by the method of initial parameters.

The calculation of a rotor solid model including the bearing housing has been performed by the finite element method. Results of both calculations highlight the need to add bearing housings into dynamic analyses of the pump rotor. The calculation performed by modern software packages is more a time-taking process, at the same time it is a preferred one due to a graphic editor that is employed for creating a numerical model.

When it is necessary to view many variants of design parameters, programs for beam modeling should be used. Emmanuel, Efenji A. Online Monitoring detects and diagnoses incipient faults, performs predictive maintenance, and can estimate the Remaining Useful Life RUL of Active and Passive Components before they fail. The fault types, fault features, and their detection methods and effectiveness for the LCP were established by diligently following the guidelines recommended by EPRI.

Analysis of cavitation behaviour in a centrifugal pump. Cavitation is a well-known problem in centrifugal pumps , causing serious damage and substantial head losses.

However, the reason for the sudden head drop in cavitation curves is not fully understood. The blade loading and energy transfer are analyzed for various cavitation conditions. The results show that the existing of the cavities changes the load distribution on blades. With the decrease of NPSH the loads on blades tend to increases in the rear part but decreases in the front part.

If NPSH is not so low, sometimes the overall torque may increase slightly, thus the head may also increase slightly. But if the NPSH become low and reach a threshold value, the overall torque will also decrease. At the same time, the energy dissipation in the vortices increases greatly because of the growth of the cavities.

Centrifugal pumps and allied machinery

These two reasons make the head drop rapidly. Full Text Available The interflow plays important roles in centrifugal pump design. In order to study the effect of rotation and z-axis on internal flow, two-dimensional particle image velocimetry PIV measurements have been performed to measure the steady velocity field on three planes in all impeller passages of a low specific-speed centrifugal pump. The results show that the relative velocity flows in blade passages are obviously different in terms of the positions of the blade relative to the tongue.

The interaction between the impeller and tongue changes the occurrence and development of low velocity region with time. From shroud to hub, the relative velocity gradually increases, and the minimum value moves toward the suction surface. Cavitation simulation and NPSH prediction of a double suction centrifugal pump.

Centrifugal Pumps and Allied Machinery

This paper illustrates the flow field numerical analysis of the double-suction centrifugal pump. According to the Pump Linx calculation result and the Cavitation damage index, the cavitation position, level and the cavitation characteristics of the double-suction centrifugal pump has been predicted. For the further objective, the simulation of the flow field in the double-suction centrifugal pump under different inlet conditions has been carried out. By the result analysis, NPSHr has been predicted; the reliability of the results has been verified by comparing with the experimental data.

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At the same time, this practice can provide guidance for the optimal design of double-suction pump. A theoretical model for calculating the flow of the working fluid through the interior of a centrifugal pump model is presented in this paper as well as the numerical analysis on the virtual model performed with the ANSYS CFX software in order to highlight the flow parameters and flow path-lines that are formed during centrifugal pump operation.

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Origins of hydrodynamic forces on centrifugal pump impellers. Hydrodynamic interactions that occur between a centrifugal pump impeller and volute are experimentally and theoretically investigated. The theoretical analysis considers the inability of the blades to perfectly guide the flow through the impeller, and also includes a quasi-one dimensional treatment of the flow in the volute.


The disturbance at the impeller discharge and the resulting forces are determined by the theoretical model. The model is then extended to obtain the hydrodynamic force perturbations that are caused by the impeller whirling eccentrically in the volute. Under many operating conditions, these force perturbations were found to be destablizing.