Pump performance curves and matching a pump to a piping. Pump performance curve and its data tolerance limits. Berkeley type b hydraulic performance by product group b series centrifugal pumps pump model nomenclature. Cornell pump company clackamas, oregon performances shown are for s. Ebara submersible sewage pumps dlkfu performance curves project. What follows is a brief presentation of the different pump performance curves.
Pumps can generate high volume flow rates when pumping against lowpressure head or low volume flow rates when pumping against highpressure head. The class h squirrelcage induction motor delivers outstanding performance and superior heat trans. The impeller, of course, is the moving element inside the pump volute, which drives the liquid. The most efficient point of two curves is illustrated in figure 1. Every flygt pump is performance tested in the factory can handle dry solids up to 8% sustained high efficiency is priceless flygt npumps take on the toughest applications and get the job done. Reading pump curves by james mcdonald, pe, cwt originally published. Understanding of centrifugal pump performance curve is very important for select a proper pump for the required application. Dlkc6039203 solid dia 1 12 lm65 0 0 0 20 40 60 80 100 120 140 160 180.
Positive displacement pumps are those in which energy is imparted to the liquid in a fixed displacement volume, such as a casing or a cylinder, by the rotary motion of gears. Before we start first we will understand the basics of centrifugal pump performance curve. How the shape of the pump performance curve is related to changes in well performance. Actual on site performance will be given by the intersection of the pump curve with the actual system curve. A curve is defined for a specific operating speed rpm and a specific inletoutlet diameter. Smaller impellors produce less pressure at lower flow rates. And finally, some advice on what to expect from the results of performance tests. Affinity laws modify the pump curve the performance of a centrifugal pump will vary with speed according to the formulae below fig 4. This is an overview of pump capabilities as detailed on the pumps performance curve. Point a o on the performance curve is where the desired flow rate gpm and total dynamic head tdh points intersect. Below you will find performance curve information for the vaughan horizontal, vertical, pedestal and submersible pumps. By understanding all of the information provided by a performance curve, one can make intelligent decisions about the pump type, size, rpm, horsepower and efficiencies that will be required for the system. It is good practice to select a pump with an impeller.
Knowing how to read a centrifugal pump curve is essential to the health of your system. The curves for power consumption and efficiency will normally only cover the pump part of the unit i. A system curve can be defined as the relationship between flow and head in a fixed hydraulic network. The triangle representing the rated duty point is the location where the system resistance curve that the pump is feeding, crosses the pump headflow curve. The pump performance curve describes the relation between the flowrate and the head for the actual pump. Composite curve for size selection performance curves based on 0 psig differential pressure at 12 of maximum speed. To select a proper pump for a particular application it. Cavitation can be recognised by a strongly increased noise level of the pump with a simultaneous reduced flow rate.
These pdf s contain detailed information, but please consult vaughan or your vaughan representative to assist with your final pump. Running too far out on the curve, or too far back, can cause damage to the pump, excessive energy consumption, and overall poor performance. In general, pump curves are designed according to iso 9906 annex a, which specifies the tolerances of the curves. Pump performance curves generally show performance for various impeller diameters or trims. On one axis of the pump curve, you will find capacity, and on the other, total dynamic head tdh. The relationship of these variables is depicted in pump performance curves which are usually supplied by the manufacturer of the pump.
Teikoku canned motor pumps playing a role in various situations around the globe teikoku electric, the worlds leading canned motor pump manufacturer. The free delivery condition is achieved when there is no flow restriction at the pump inlet or outletin. Selecting a centrifugal pump by system analysis 2012 instructor. Selecting a positive displacement pump using performance curves choosing a pump series a. The head and flow rate determine the performance of a pump, which is graphically shown in the figure as the. Ebara submersible sewage pumps dlkfu performance curves. The overall performance curve of centrifugal pumps connected in series can be calculated by adding the differential head of each pump at the relevant flow rate.
Manufacturers will put several different trim curves on a pump performance curve to make pump specification easier, although this sometimes makes the pump performance curve more difficult to read. Microsoft powerpoint 4 tea water services pump curves final mf author. Gather all application information including product nature, viscosity, temperature, nipa, flow rate and pressure loss. Booster service spraying systems irrigation water circulation liquid transfer general purpose pumping features and benefits the 3656 and 3756 sgroup pumps from goulds water technology have been designed with technical benefits to meet the needs of users in a variety ofread.
These calculations result in a set of curves called affinity curves, with imaginary lines affinity lines that. Components of centrifugal pump performance curve 1. Back to basics w hen i left university, i found that i needed additional information to turn my theoretical knowledge of fluid mechanics into the practical knowledge required to specify a pump. How to read a pump curve for centrifugal pumps pumpworks. A pump performance curve provides us with all sorts of useful information, including pump model, size, speed, flow rate gpm, efficiency, etc.
How to read a pump performance curve part 1 espsystemwize. Pump performance charts with multiple pump curves are shown below. Care must be taken to correctly read the performance data from pump curves. Pump performance curvetechnical informationproduct lines. Performance curve free delivery the maximum volume flow rate through a pump occurs when its net head is zero, h 0. What is the importance of performance curve of pumps in. As we covered in a previous article, reading a pump performance curve is not always as easy as it seems, but once you understand the basics, it appears to be pretty straight forward. The performance of a pump is directly related to its speed in rpm, providing there is no cavitation. A pump will operate where its performance curve intersects the system resistance curve above centre as shown by the dotted lines. Department of energys industrial technologies program itp and the hydraulic institute hi. Centrifugal pump characteristic curve for an operations engineer who is working in a chemical process industry or a process engineer who is involved in hydraulic calculations understanding the centrifugal pump performance curve is an important aspect. Darley fire pumps, apparatus, water systems, robotics. Selecting a positive displacement pump using performance.
The presentation of parameters in a characteristic curve can provide. Depending on its horsepower, size or speed, a pump can operate at any point up or down the system curve. Head is a measurement of the height of the incompressible fluid column the pump could create from the kinetic energy, that the pump gives to the liquid. Pump performance curve a centrifugal pump performance curve is a tool that shows how a pump will perform in terms of head and flow. With this in mind, the curves typically plotted are head vs. An increasing volume is opened to suction, filled, closed, moved to discharge. We are adding these curves to our electronic downloads as time permits. The starting point for the curve at no flow, will be the same. In our example below, these curves show the performance at 1450 rpm for a 3 inlet2 outlet. Positive displacement pumps performance and application by david b. Cstn septemberoctober 2004 t he performance of a centrifugal pump can be shown graphically on a characteristic curve. Improving pumping system performance acknowledgements this second edition of improving pumping system performance.
How to read a centrifugal pump curve crane engineering. If everything in the field matches everything the pump was tested at. To verify if the pump is performing properly or establish if we have the right pump for the. Firefighting equipment, pumps, and firetrucks located in itasca illinois. Centrifugal pump performance curves and technical information 0 20 40 60 80 100 120 140 0 10 20 30 40 50 60 70 80 0 100 110 capacity ead ft nps in feet 10 20 30 40 50 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 160 npsh req u i r e d 2 5 0 m i mp e l r dia t r 9 16 45 h e a d c a p a c i t y 0 5 10 15 20 25 30 35 40 gpm lbs. What is the importance of performance curve of pumps in industry. Understanding centrifugal pump curves when selecting a centrifugal pump, one should match the performance of the pump to that needed by the system. A pump performance curve indicates how a pump will perform in regards to pressure head and flow.
The possible combinations of total pressure and volume flow rate for a specific pump can be plotted to create a pump curve. The power input curve of a low specific speed pump has its minimum value at q 0 shutoff point, whereas the power input of a high specific speed pump reaches a maximum at q 0. The possible combinations of total pressure and volume flow rate for. Let us look again at examples of stable and unstable pump curves. Centrifugal pump performance curves and technical information 0 20 40 60 80 100 120 140 0 10 20 30 40 50 60 70 80 0 100 110.
A typical characteristic curve shows the total dynamic head, constant horsepower, efficiency, and net positive suction head all. In this article, pump performance curve is further detailed and we will answer the following two questions. Centrifugal pump characteristic curve components of. Below is a pump curve showing flow, head, hp, npshr, efficiency, impeller diameter and the mcsf.
Make sure that the actual pump speed matches the speed of the pump s characteristic curve to avoid errors. B series centrifugal pumps model b1xrs curve 7328 date type ccmd fm cplg fm belt sae hydraulic ac engine model b1xrs b1xrs rpm 20003600 20003600 nominal. As you may know that flow, head and power consumption vary with the pump speed. A typical composite curve includes the pump performance curves, horsepower curves and npsh required. System curves raphical representation of the relationship between discharge and head loss in a system of pipes the system curve is completely independent of the pump characteristics the basic shape of the system curve is parabolic because the the head loss equation and on the velocity head term is 2. Centrifugal pump performance curves and technical information. In fluids dynamics the term pump head is used to measure the kinetic energy which a pump creates. To do that, an engineer would refer to a pumps composite curve. The above factory performance curve is from a job in houston texas with a 10 38 impeller. Understanding pump performance curves progressive dairy. The curve defines the range of possible operating conditions for the pump. Judging by the questions i see asked nearly every week on linkedin and elsewhere, i believe this is a problem shared by many engineers early in. Pumps and pumping system bureau of energy efficiency 118 figure 6.
Jordan, an application engineer at crane engineering, explains how to read a centrifugal pump curve in the video below. Pump curves pumps can generate high volume flow rates when pumping against low pressure or low volume flow rates when pumping against high pressure. As an example in the above curve, consider an ndp40 series pump performance curve with rubber diaphragms, pumping 80 gpm at 50ft tdh. The pump characteristic is normally described graphically by the manufacturer as the pump performance curve. In this article, we will discuss how to read a centrifugal pump performance curve. The pump performance curve shows the performance of a given pump with multiple size impellers, so the engineer can specify not only the best pump but the best impeller.