Horizontal Centrifugal Pump Research Articles

Fault diagnosis of horizontal centrifugal pump orifice ring wear and blade fracture based on complete ensemble empirical mode decomposition with adaptive noise-singular value decomposition algorithm

Horizontal centrifugal pump orifice ring wear and blade fracture failure will not only affect the hydraulic performance but also affect the safety and stability of the whole unit. In this paper, the horizontal centrifugal pump orifice ring wear and blade fracture failure are studied, and carry out condition monitoring and fault identification through the vibration signal under the failure. Combined with the Complete Ensemble Empirical Mode Decomposition with Adaptive Noise and Singular Value Decomposition algorithm of adaptive noise, a vibration feature extraction method of horizontal centrifugal pump based on intrinsic mode singular value is proposed. Through the BP neural network, based on the time domain, frequency domain, wavelet packet-AR spectrum, and intrinsic mode singular value characteristics of single-point and double-point vibration, the identification model is constructed and the identification effect is compared. The research shows that the vibration feature recognition effect of CEEMDAN-SVD decomposition is verified based on BP neural network model, and the BP neural network is improved by Particle Swarm Optimization to further improve the recognition effect and speed, which provides the diagnosis model for the design of subsequent diagnosis system.

Модель информационно-измерительной системы контроля центробежного грузового насоса на танкере-химовозе типа «Иван Поддубный»

On chemical tankers, the main cargo devices are pumps, so it is necessary to constantly monitor their operating conditions and performance indicators during operation. The article discusses modeling using MATLAB/Simulink software of a single-stage horizontal centrifugal pump, which can be used to create an information-measuring system for monitoring the performance of cargo pumps using the example of a chemical tanker of the Ivan Poddubny type. An analysis of the modeling results is carried out, including an assessment of pump efficiency, pressure loss and other indicators in various operating modes. The results allow us to draw conclusions about the operation of the pump under various loads and variable conditions. The simulated pump worked with seven different liquids pumped in chemical tankers: ethyl alcohol, N-propyl alcohol, phenol, chloroform, castor oil, 55% nitric acid and water. After this, a neural network was created using the MATLAB/Neural Network Fitting Tool application. The input data of the network were volumetric flow, pressure, shaft power, torque and suction pressure. The output value was the pump efficiency, the value of which was estimated for each fluid. The root mean square error of approximation was very close to zero. According to these results, the artificial neural network showed satisfactory results for predicting the efficiency of the centrifugal cargo pump of the Ivan Poddubny type chemical tanker; therefore, it can be used in ship information and measurement systems. Overall, this paper represents a valuable research contribution to the field of modeling horizontal centrifugal pumps using Simulink that can be useful to engineers and researchers involved in the design and optimization of these pumps.

The influence of blade fracture on the internal flow characteristics and rotor system of horizontal centrifugal pumps

The blade fracture of horizontal centrifugal pump will not only affect the hydraulic performance of the pump, but also affect the safety and stability of the whole unit. In this paper, for horizontal centrifugal pumps, five single-blade fracture schemes are designed and numerical simulations are carried out under different operating conditions. The results show that with the increase of fracture size, the influence on the hydraulic characteristics of the pump shows a decreasing trend, and it will also affect the turbulent kinetic energy distribution near the impeller inlet, so that the internal flow becomes complex and the flow loss increases. The radial force on the impeller changes periodically, and its magnitude shows a nonlinear decreasing change with the increase of the fracture size. The pressure pulsation analysis of several monitoring points in the worm shell shows that as the fracture size increases, the amplitude of the lobe frequency slowly rises, and the shaft frequency, which is second only to the lobe frequency, becomes higher and higher and begins to dominate. A study of the rotor system shows that the maximum deformation of the impeller occurs at the edge of the impeller cover and the maximum equivalent stress occurs at the blade exit; blade fracture causes a significant reduction in the latter third-order intrinsic frequency.

A Study on Booster Pump System with Flow Sensor for Individual Flow Control Method

Booster pump system (BPS) can control the number of revolutions through an inverter by combining two or more vertical or horizontal centrifugal pumps in a series. Efficiency and energy savings, the most appealing aspects of booster pump systems, can be improved by controlling the operating conditions of individual pumps by measuring the flow rate of each pump. For improved operation, a booster pump system with a flow sensor to detect individual pump flow rates and a control algorithm to manage each low and high flow rate pump’s revolutions per minute are critical. To achieve this, first, the turbine-type flow sensor was developed through computational fluid dynamics and experimentation. The flow sensor was improved using computational fluid dynamics, and its accuracy was validated through experiments. The resulting flow measurement accuracy of the designed flow sensor was within 4%, with a measurement uncertainty of 0.4%. In addition, an experimental pump facility was built and used to evaluate booster pump system performance to investigate the energy saving rate. Then, after driving one low-flow rate pump at a set pressure, the flow and frequency control operation algorithm was used. This algorithm increased the allowed output of the drive pump by increasing the inverter’s frequency. When the frequency corresponding to the allowed output is achieved in the low-flow rate pump rather than the high flow rate pump, power savings increased due to the low-flow rate pump’s extended drive range. The investigations on the developed system’s energy consumption revealed that the energy savings were approximately 6.2% compared to the conventional system, depending on the system in question. The development of a booster pump system with a flow sensor was tested, and it was found to be effective.

Predicted resource of the most loaded bearing of a horizontal centrifugal pump

The paper gives a derivation of the formula for calculating the predicted resource of the most loaded bearing of a horizontal centrifugal pump. A model of a horizontal centrifugal pump, as well as the action of axial forces and radial reactions, are considered.

Analysis of unsteady radial forces of multistage centrifugal pump with double volute

PurposeRadial vibration of horizontal centrifugal pump has a close association with radial exciting forces. The purpose of this paper is to analyze the unsteady radial force in multistage centrifugal pump with double volute in detail and investigate the relevance of static pressure, radial force and radial vibration.Design/methodology/approachThe unsteady numerical simulation with realizable k-ε turbulence model was carried out for a multistage centrifugal pump with double volute using computational fluid dynamics codes Fluent. The performance tests were conducted by use of a closed loop system and performance curves from numerical simulation agree with that of experiment. Vibration tests were carried out by vibration probes instrumented on the bearing cover of pump near no-driven end. Fast Fourier transform was used to obtain the frequency components of radial forces on the impellers from numerical simulation, which are compared with ones of radial vibration from experiment in Y and Z direction. And the static pressure distributions in the impeller were analyzed under different flow rates.FindingsThe symmetrical double volute can effectively balance radial forces. The maximum radial force and vibration velocity appear at 0.6 Q among the three flow rates 0.6 Q, Q and 1.2 Q. The frequencies corresponding to relatively large amplitude of vibration velocities and radial forces on the impellers in Y direction are blade passing frequency of the impellers. Blade passing frequency of first-stage impeller and shaft frequency are predominating in Z direction. It indicates that the radial vibration of centrifugal pump is closely related to the unsteady radial force.Originality/valueThe unsteady radial forces of the impeller in multistage centrifugal pump with double volute were comprehensively analyzed. The radial forces should be considered to balance during the design of multistage centrifugal pump.

Excitation Force Identification of Rotating Machines Using Operational Rotor/Stator Amplitude Data and Analytical Synthesized Transfer Functions

Hydraulic excitation forces of rotating machinery are normally determined by direct measurement techniques like strain gages, load cells, etc. This paper presents an indirect method, in which frequency response transfer functions are analytically generated, using linear rotor/stator models. Inverse transfer function matrices are multiplied with operational vibration data to yield fourier transformed operational excitation forces. Analytical excitation techniques and numerical inversion methods of the system transfer function matrix are evaluated. External error sources and guidelines for an error sensitivity analysis of the predicted forces are described. Experimental verification is presented on a large horizontal centrifugal pump, with reasonable results. Typical application is shown on multistage hydro carbon and boilerfeed pumps.

How To Keep Well Pumps Operating

Knowing how a well pump and the well in which it is installed function together is essential to proper operation of water well supplies. The horizontal centrifugal pump and the submersible pump are discussed. Also of importance is an understanding of well construction and its two main elements, the part of the well that serves as housing for the pumping equipment and as a vertical pipe through which water flows upward from the aquifer to the point where it enters the pump itself, and the intake portion of the well. Well system failures are briefly discussed, and monitoring well performance and anticipating problems with wells and pumps are also mentioned.

Vertical Short-Coupled Turbine Pumps

horizontal to the vertical type of pump for use in public water systems, irrigation condenser systems, bilge and sump service, drydock and fire equipment, mine drainage, steel plants, and many other industries. These applications represent a very considerable field in which the horizontal centrifugal pump has served long and admirably and in which the vertical type of pump offers a challenge. Some very large units of the volute type with vertical shafts have been installed, but the type of pump under consideration at present is the concentric-case unit used in deep wells. The rapid agricultural development of the arid and semiarid portions of the western United States can be largely attributed to progress in the use and improvement in the design of deep well pumps. For some time this type of pump has been accepted as a reliable machine for industrial projects and the public utility field. The modern version develops efficiencies as high as and sometimes higher than horizontal pumps. Consequently, it no longer is considered a special pump to be used only in deep settings where the impellers operate at an elevation below the suction limit of the horizontal pump. The short-coupled vertical pump can be arranged for either underground or aboveground discharge. The general design is illustrated in Fig. 1. Prior to the war many small cities mounted vertic l-turbine pumps directly over s rvoirs, with the pumping element submerged in the water and discharging into the service mains. The pump is admirably adapted for such operations as booster cooling and circulating, ground drainage, air conditioning, caisson and mine dewatering, fire protection, and general-purpose pumping. A few of the advantages of the vertical pump are: 1. A minimum amount of space is required for foundations, as the motor support and discharge elbow are in egral. 2. Variation of the length of the discharge column makes this type of pump installation very flexible. 3. No priming is required because the pumping element is generally submerged. 4. The pump head and the motor can be located above the high-water level to avoid flooding and motor burnouts.

The Value of Efficiency in the Purchase of Pumping Equipment

So many different types of equipment are available to meet the many variations in pumping requirements that no attempt will be made in this paper to compare the efficiency of one type of equipment with another; that is, centrifugal pumps as against airlift or plunger pumps for wells, or horizontal centrifugal pumps against reciprocating pumps for work from surface reservoirs. Briefly stated, the value of efficiency in any pumping equipment is the monetary saving which will accure to the owner throughout the life of a pump, due to the more effective use of power purchased or generated to drive the pump, whether it be electric power purchased, or coal, fuel oil, natural gas, or gasoline purchased to generate electric power, or to operate the driving mechanism. Let us take the horizontal centrifugal pump, direct connected to an electric motor, for which current is purchased from some utility company. Depending upon its location and the size of the city, electric power can be purchased through most companies at various rates, from about 0.7 to 3 cents per kilowatt hour. We will assume that its cost is 1 cent per kilowatt hour, as this is a fair average except in very small towns. Centrifugal pumps have been developed to the point where efficiencies now range up to as high as 90 percent in the larger sizes, and for a user to purchase a pump with an efficiency of less than 70 percent would be more costly during the life of the pump than would be a pump with an efficiency of 80 percent or better, even at an increased cost, if the pump operated as much as ten hours daily