Time current curves motor protection motor protection relays are typically programmed to operate approximately halfway between load current curve and the motor damage curve. This article will take a closer look at the table type data and concentrate on the current amps performance data. How to read a centrifugal pump curve crane engineering. Using the rpm curves, we can find how much tdh the pump will create at a given flow rate at any point on that curve. Each of the four sectors impulsive, dependent, independent, interdependent is represented by an overall cultural mindset shown in speech marks. Connectors with charges nipple connectors with pressure switch 5 5 55 43. Flow gph 10 20 30 40 50 60 70 80 90 100 rpm 65 60 55 50 45 40 35 30 25 20 15 10 5 0 absorbed power hp 0. Each mindset creates distinct organizational characteristics and relates to a certain level of. Dlkc6039203 solid dia 1 12 lm65 0 0 0 20 40 60 80 100 120 140 160 180. These pdf s contain detailed information, but please consult vaughan or your vaughan representative to assist with your final pump selection. Performance characteristics of fixed volume ratio compressors.
Ebara submersible sewage pumps dlkfu performance curves. The coefficient of performance can be estimated as the ratio of the cooling capacity to the power input. In this blog, were simply going to cover the elements of a pump curve more accurately referred to as a pump performance curve and explain why these elements are relevant to the selection of a pump. Mcquiston and parker, 1994, heating ventilating and air conditioning, john wiley and sons, inc. Horsepower increases with higher flow rates and higher tdh. If you already know about the centrifugal compressor performance curve, definitely this article will refresh your knowledge. Atmospheric pressure at the inlet for pressure curves and atmospheric pressure at the discharge for vacuum curves. Intersecting the rpm curves are horsepower requirements.
Below you will find performance curve information for the vaughan horizontal, vertical, pedestal and submersible pumps. Compressor data comes in either graph or table type. Sample performance curves for full load compressor at 125 psig. Reading centrifugal pump curves national environmental. A insert 5 data points type over underlined values from the compressor head and efficiency curves. A performance curve is one of the effective way to assess the power of a compressor. The performance of a pump is directly related to its speed in rpm, providing there is no cavitation.
This manual does not for designing centrifugal compressor and those parts. Timar department of chemical and biochemical engineering, faculty of chemical and food technology, slovak university of technology, sk812 37 bratislava email. Reading and understanding centrifugal pump curves is key to proper pump selection, and to their reliable. You can graph pumps individually, in series or in parallel and perform side byside comparisons. Performance curve for vacuum pump performance curve for. You can use the above relations to convert the various factors of the performance curves and see thier values at different rpms other than at the rpm stated by the manufacturer for that particular performance curve. Compressor characteristic is the curve to show the behaviour of fluid, like change in pressure, temperature, entropy, flow rate etc. How to read a centrifugal compressor performance curve. If you are new to the compressor, this article will definitely make yourself familiar with the centrifugal compressor performance curve.
The power required to push the fluid through the pipe, w. Reading and understanding centrifugal pump curves is key to proper pump selection, and. Reading centrifugal pump curves the environmental finance. Qtp quick time performance low profile electric exhaust cutout kit qtec66k2. Values from manufacturers predicted perfromance curves instructions.
Performance analysis of oilinjected screw compressors and its applications mitsuru fujiwara mechanical engineering research laboratory, hitachi, ltd. N is the speed of the pumo rpm, q is th flow rate, h is the head and bhp stands for brake horse power. 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. Specifying required performance when purchasing reciprocating compressors purchasing a new compressor can be an involved and expensive process. But it is unrealistic to think you can remain in this zone indefinitely, you need to recharge your battery in the comfort zone to sustain your performance long term. This design may not be reproduced, modified or redistributed without written permission from w. If clear flow impeller is mounted the performance can be up to 10% lower than on the curves shown.
The required flow is 80 m3h and a diffrential pressure of 45 m water gauge. Pump performance curves generally show performance for various impeller diameters or trims. Centrifugal compressor performance degradation centrifugal compressor performance is evaluated against the wheel curve baseline for this particular unit. For any set of motive, suction, and discharge pressures, the capacity is fixed. A pair of these might drive a 35foot sportfisherman. But a solid understanding of pump curves is absolutely necessary for anyone involved in the specification of hydronic equipment.
The power input to a compressor can be expressed as. It is good practice to select a pump with an impeller. For example, doubling the pump speed flow x 2 head x 4 power consumed x 8. A typical characteristic curve shows the total dynamic head, constant horsepower, efficiency, and net positive suction head all. The performance curves in figure 2 represent mnmum compressor power requirements. Cstn septemberoctober 2004 t he performance of a centrifugal pump can be shown graphically on a characteristic curve.
This type of ejector is essentially a constant flow device. Pressure differential or head is given in kpa or mws meter water column. Discussion includes an overview of how variablespeed drives affect. Performance curve reflects hydraulic institute tolerances and guidelines. Performance is the same only at best efficiency point. Microsoft powerpoint 4 tea water services pump curves final mf. Lets take a look at a fairly typical highoutput diesel, the yanmar 6cxmete, and see what her curves will tell us. The function of a compressor is to increase the pressure of a fluid passing through it, so that the exit pressure is higher than the inlet pressure. In the article, we will discuss how to read a centrifugal compressor performance curve. Flow, head, impeller trim diameter, efficiency, power, npshr, mcsf minimum continuous stable flow and rpm. Reading pump curves by james mcdonald, pe, cwt originally published. A method to estimate the performance of reciprocating.
With an understanding of the terminology unique to centrifugal air compressor performance curves, you can develop a predictable and probable actual projected operating efficiency based on a manufacturers performance curve. Running too far out on the curve, or too far back, can cause damage to the pump, excessive energy consumption, and overall poor performance. Appendix cperformance curves for models d51 and f51 c. Pump performance curves ef 04w2 ef 04w2 60hz 3480 rpm discharge frequency 2 reference curve curve number rated power hydraulic efficiency 62. 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. The new york blower company is committed to supporting and supplying necessary equipment to meet the critical demands of the supply chains essential to aid america in this time of need. Care must be taken to correctly read the performance data from pump curves. As shown below, this unit had an 11% deviation in head at the point shown, likely due to impellor fouling, impellor wear, andor increased clearances. Understanding fan performance curves new york blower. Vaughan pump performance curves resources to assist you. Centrifugal pump performance curves and technical information. For example, doubling the pump speed flow x 2 head x 4. C is the compression efficiency, ratio between the theoretical power to the. Specifying required performance when purchasing reciprocating.
Differential pressure or some cases polytrophic head vs inlet flow rate. Understanding pump performance curves progressive dairy. The pump curve also displays the pump model, the pump size and number of stages for multistage pumps. Trane engineers newsletter live series variablespeed compressors on chillers abstract this enl discusses the operational, performance and application differences for centrifugal dynamic compression and helicalrotary positive displacement compressors. Cds shows the water equivalent iso performance curve. Beta monitors the compressors performance to detect changes in performance. Understanding engine performance and engine performance. From there you can adjust operating speeds, viewsave electronic curves and data sheet reports in a pdf. Centrifugal compressor performance is evaluated against the wheel curve baseline for this particular unit. Pump performance charts with multiple pump curves are shown below. Compressor performance curves are available from the compressor manufacturer for each of their compressors. Centrifugal compressors performance is usually expressed in terms of a group of curves that graphically display the range of. Jordan, an application engineer at crane engineering, explains how to read a centrifugal pump curve in the video below.
A pump performance curve indicates how a pump will perform in regards to pressure head and flow. The curves reflect maximum performance characteristics without exceeding full load nameplate horsepower. Pump performance curves are based on clear water at sealevel. Then, curve fitting was used to develop the pv, qv, pf, and qf relationships for motor running and stalling states. Vantage point business village, mitcheldean, gloucestershire, gl17 0dd uk tel. Compressor performance an overview sciencedirect topics. For variablespeed pumps, the performance curve is given at minimum and maximum rpm. Using manufacturer performance curves to develop projected operation efficiency. Because the inertia of the airconditioning motor is very small. Centrifugal pump curves show 8 important factors that are critical in selecting the right pump for your application. Sanden performance curves allow our consumers to have an overview of the compressors power consumption, refrigerating capacity and a ratio of performance from these two values.
Opposite the point where the line 2 cuts the efficiency curve for 4. The resulting performance model ignores the dynamic response of the airconditioning motor. Aug 31, 2018 if you already know about the centrifugal compressor performance curve, definitely this article will refresh your knowledge. Performance curve model description a xfe20 5 hp, single speed full rated a xfet20 5 hp, tefc superduty single speed g xfk20 5 hp, 3phase, superduty motor b xfe12 3 hp, single speed full rated b, e xfds12 3 hp, 2speed full rated b xfet12 3 hp, tefc superduty single speed h xfk12 3 hp, 3phase, superduty motor c xf12 3 hp, single speed full rated d xfe8 2 hp, single speed full. From there you can adjust operating speeds, viewsave electronic curves and data sheet reports in a pdf format, generate. Each gbh1 type can be applied both as vacuum pump and compressor in continuous operation over the total stated performance curve range. Understanding fan performance curves covid19 update. The performance curves are based on air at a temperature of 59 f and an atmospheric pressure of 401. Knowing how to read a centrifugal pump curve is essential to the health of your system. The original performance curves of polytropic head against volumetric flow for varying rotational speeds are used as an input to define a range of mach numbers within which the nondimensional invariant performance curve of head and volume flow coefficient is generated. Therefore, it is prudent that companies require a full array of compressor performance from bidding compressor packagersoems. Performance analysis of oilinjected screw compressors and.
The performance of thermocompressors as related to paper. Ese01061en 1507 alfa laval reserves the right to change specifications without prior. The centrifugal compressor performance curve consisting of the following three important curves. This is the zone of maximum performance when you are energised and focused ready to meet a new challenge. The three curves show the effect of three motive steam rates. Manual purpose to be used for selection, application into the system, power and cooling water estimation. For other conditions see page 16 features, descriptions, applications met bel concept in out 1. Performance curves for underground lpg tanks will vary based on the specific installation.
The following multipliers are used to correct performance and b. Physically, this is achieved by three different size steam nozzles. Operation below these curves would require a decrease in entropy, violating the second law of thermo dynamics. The characteristic curves apply to pumps with cast iron or bronze impellers. Performance curves griswold pump company 1 grs10010c01 1 12 x 1 6aa 1800 rpm curve. The pump performance curve shows the correlation between media flow q and the pressure differential or head h that the pump creates. For submittal data documents caret right click here. Centrifugal air compressor basics part ii understanding the. Dimensionless characteristics of centrifugal pump p. The performance curve the performance curve depicts the impact of culture on performance. This tech brief examines how pump curves can provide data about a pumps abili.
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