How to size an electric motor for use with a centrifugal pump. For example, if a pump were to be driven by an electric motor at 60 hertz powersupply determine if the pump can be selected to run at 2pole speed, or 3600 rpm. Selecti on informati n pumps are available in a range of volute and impeller combinations that meet the requirements of various pumping systems. Electric motor driven centrifugal pumps dual pumps. Centrifugal pump with motor pumps and parts online. Pump sizing and selection made easy chemical engineering. What types of electric motors are used for water pumps. Effect of specific speed nq on centrifugal pump characteristic. In many cases, it will make sense to select a motor large. Types and selection of pumps the mechanical device or arrangement by which water is caused to flow at increased pressure is known as a pump and the process of using a pump for this purpose is known as pumping. Centrifugal pumps can be used in many applications, but in order to operate reliably, with optimal energy use and maximum life span, a pumps design characteristics must suit the intended service. The pump first converts this energy from water into velocity with a circular centrifugal force and then into head or elevation pressure energy as it passes from the eye of the pump, through the impeller and finally through the casing and volute. A few simple steps will help you select the right motor for your centrifugal pump application.
Centrifugal pumps centrifugal water pumps absolute. A volute is the stationary housing in which the impeller rotates that collects, discharges and recirculates water entering the pump. Amt inline centrifugal circulator pump 569095, 32 gpm, 0. Electric motors operate at their peak power factor and efficiency when fully loaded. Electric motors are generally sized at predetermined intervals. The following is an explanation of how motors are designed to operate at a certain speed and how motors speed varies when installed to drive a centrifugal pump. Amt straight centrifugal pump 2500 gpm, 30 hp, 230460 volts, 3phase nema 286jm, 30 hp, 1780 rpm, 3phase, open, drip proof electric motor 9. As in any other application, a wellchosen pump motor must match the application. Will he supply a c or d frame adapter, or will the pump to motor.
How to size an electric motor for use with a centrifugal pump intro. Centrifugal pump motor selection, installation and start up pump. The following is a pump sizing problem to illustrate the calculations in this article. It is particularly important to consider pump suctionside line losses when pumping viscous fluids. Centrifugal pump is pumping fluid with density of 1, kgm 3 from open reservoir to reactor. Pump selection guide the right pump for the right application. Centrifugal pump motor selection, installation and start. When choosing a motor for a centrifugal pump, you must consider the impeller size, maximum capacity, specific gravity of the fluid, and service application in case api requirements apply. Hollow shaft pumps are driven from the solid shaft on the electric motor or gas engine. The ace electric motor driven pumps are primarily used for the circulation of liquids in air conditioning and refrigeration applications. You are told to purchase a pump for your manufacturing facility that will carry water to the top of a tower at your facility. Due to the renewed interest in energy saving, it has become more popular to utilize electrical variable frequency drives evfd to power pumps which results. Electric motors operate at their best power factor and efficiency when fully loaded. In the majority of cases, the driver in a centrifugal pumping system is an electric motor.
End suction centrifugal pumps horizontal multistage pump. Double seal models also available for spraying abrasive liquids. Pumps can also be driven by other drivers such as natural gas engines or even steam turbines. The electric motor is an electromechanical energy converterdrive that converts electrical into mechanical energy. How to select the right centrifugal pump plant services. Heat is produced by the driving motor and by friction in the pump itself. Amt straight centrifugal pump 440a95 absolute water pumps. We are proud to announce the next generation food safe, stainless steel motor platform for extreme environments within the food and beverage industry. Like any fixed speed pump vs pumps also required proper sizing. Electric motordriven pumps can be used as primary, supplemental, or emergency backup hydraulic power in a variety of aerospace applications.
The most common pumping unit combines a centrifugal pump driven by an electric motor. Selecting an appropriate pump motor machine design. This heat normally dissipates through the pumped fluid but under low flow conditions. Although factory defects do occur, they are rare and tend to be quite apparent when a failed motor is inspected. The electric motor does the opposite of the generator. This design requires that the electric motor be removed to replace the mechanical seal. Common types of centrifugal pumps include submersible, priming, and axial flow. Back pullout, overhung centrifugal pump with a flexible coupling between the electric motor and the pump. Pump selection north america water franklin electric. Franklin electric offers selection tools to help you find the correct product to fit your specific needs. So, you do not want to purchase a motor that is too big. What this means is that in most cases you will need to round up to the next available motor size when determining how large a motor to couple up to a pump.
Pump can be operated within the operating envelop provided by the pump vendor, flow and corresponding head can be achieved within operating envelop along with system resistance curve. Types of enclosure for electric motors to en 60 5 9 and. This article is part of pumps 101, an elevenpart series of articles designed as an introduction to the fundamentals of centrifugal pump design, selection, and. Kent and shaun show you how to troubleshoot a motor and adjust centrifugal switches in another one of grizzly industrials easy to. Dc motors in hydraulic pump applications ohio electric. So if the pump power requirements indicate that the motor should be rated for at least 4. High viscosity fluids result in reduced centrifugal pump performance and increased power requirements. Pacer s series centrifugal pumps flow 350 to 880 lpm. Hm hms stainless steel close coupled end suction pump. Large centrifugal pumps, however, demand to be known precisely or you may not. The three phase variants will be squirrel cage due to their maintenance free nature, and mostly constant speed of operation. Pacer pumps electric drive centrifugal pump 16,800 gph, 3in.
It is necessary to calculate required power of electric motor pump and electric motor efficiency should be taken as 0. Electric motor driven centrifugal pumps for use in agriculture, horticulture, industry and home. It has been my observation that the vast majority of new electric motor failures can be attributed to improper. Amt selfpriming cast iron centrifugal pumps are designed for a broad range of high capacity applications, including dewatering, liquid transfer, circulation, drainage and irrigation. If a pump is run at the same speed as the motor or gas engine, a suitable bell housing and flexible coupler combination can be used to direct drive the pump. The selection and design of all of these components will have an effect on the overall efficiency of the pump. An impeller is a rotating disk with a set of vanes coupled to the enginemotor shaft that produces centrifugal force within the pump casing. Closecoupled centrifugal pump directly coupled to an electric motor, thereby reducing the space requirement. If you take these things into account, you will select the. Correct pump selection is the first step to ensure this, as eduardo larralde and rafael ocampo demonstrate in this first of two articles. It is preferable to select the pump with the highest specific speed within the same type of rotodynamic pump, example, within the radial flow type pumps.
Entering along or near the rotational axis through the eye of the housing, fluid is caught in the impeller blades, which accelerate the fluid and cause it to flow radially outward. Depending on the size of pump, there can be either three phase induction machines, or single phase induction machines. A typical centrifugal pump is illustrated in figure 1. During selection of the type of pump three groups of criteria can be distinguished. The selection of a vfd would just have to be added in a total wiretowater calculation gpm x tdh x s. These pumps are equipped with builtin ejector systems providing suction. Size products through fe select or franklin pump selection online.
Pump selection guide brown brothers engineers australia. Also, with a low flow, there can be problems with heat buildup. Centrifugal pump selection michael smith engineers. For more than 75 years, gormanrupp has manufactured the high performance, high quality pumps and pumping systems required for lasting service in the municipal, water, wastewater, sewage, industrial, construction, petroleum, mining, fire and oem markets.
Centrifugal pumps, diaphragm pumps, transfer pumps, car wash pumps, piston pumps, roller pumps, pump systems, pump equipment and accessories and more from dultmeier sales. By joe evans, pump ed 101 it has been my observation that the vast majority of new electric motor failures can be attributed to improper selection, installation and start up. Baldorreliance food safe motors, designed with smooth contours and advanced sealing, exceed ip69k for water, to maximize motor life in high pressure, sanitary cleaning environments. Energy efficiency considerations in pumps and pump stations. The pump is a centrifugal pump that will need to pump 800 galmin when in normal operation. Primarily, this discussion will be in regard to centrifugal pumps.
Water pump and electric motor home mindong electric. Centrifugal pumps employ a rotating impellor that uses centrifugal force to drive fluid from the inlet to the discharge side of the pump. Either you or the supplier must select the correct size electric motor, or some other type of driver for the pump. Irrigation pumps, in general, are driven either by engines or electric motors. How to troubleshoot a motor and adjust centrifugal. However, the selection of a drive could have an effect on where the various motors would be operating on their prospective motor curves full load or partial load.
Available with electric motor, gas engine, hydraulic, pto. In choosing a pump, you firstly need to select a pump appropriate for your application. Electric motor driven centrifugal pumps uk pump supplies ltd. With independent intellectual property rights, fujian mindong electric co. Typical pump efficiencies pump only brake, no motor nonclog centrifugal, 25 hp. The following is a short guide to proper selection, installation and start up of. See table 2 or 5, page 9 or 11 for the motor selection. Cat pump offers clutch options 75 to 100 ftlbs of torque on the 3cp through 15 frames. Most of our sizeable products are available in fe select, with the remaining available in franklin pump selector online.
Lets assume well be selecting the motor for the pump described by the pump. Choosing the right motor for centrifugal pump applications. Centrifugal pumps transport fluids by converting rotational kinetic energy produced by an electric motor to the hydrodynamic energy of the fluid flow. The power required to drive the pump at the rated design condition should always be less than the nameplate horsepower rating of the motor. Now select the eaton heavy duty motor with a working power range rating equal to or greater than the power range calculated for the vehicle, machine, winch, etc. The centerline discharge feature is specifically designed to prevent vapor binding and makes for convenient. There are many subcategories of centrifugal pumps based up their specific application. Motor selection for centrifugal pump applications made easy. Ideal for spraying clear liquids at pressures to 120 psi and flowrates to 200 gpm or more. Both dc and ac motors with full control are available and can be adapted to the applications individual need. Pump types typical selection criteria for centrifugal pumps are their design data flow rate or capac ity q, discharge head h, speed of rotation n and npsh, the properties of the fluid pumped, the application, the place of installation and the applicable regulations, specifications, laws and codes.
418 1166 747 764 957 508 426 546 1138 1314 1470 533 1001 313 1149 1178 1211 803 334 1123 1022 1266 1191 900 878 24 774 964 1407 515 1242