Pump curve and system curve

Pump system curve represents the resistance offered by the system ie. AFT Fathom can easily generate a pump and system curve for your piping system. Creating a pump and system curve for a simple system with a single flow path and no control features is an easy and typically well-understood process. However, as piping systems are quite complicated with lots of branch points, control features, and dynamic.

In the pump selection software, the system curve can be manipulated by manually entering data points, and is particularly useful when evaluating the variable-speed performance of a pump.

In addition to plotting the pump and system curves , a Pump curve graph provides other elements important for choosing the correct product for your application. H sys, system head Pumping effort and friction are accounted for when the system curve intersects the pumping head curve Hpump(Q) Plot this versus Q Obtain this versus Q from the manufacturer Where the two intersect, that’s where the pump operates. Efficiency is expressed in percentages on the right of the curve graph. A system curve is a graphical representation of the head and flow characteristics of a hydraulic system. Pumps move water through hydraulic systems that include: A source of liquid Suction piping or an intake structure leading to the pump Discharge piping leading away from the pump to the discharge point.

Hi, Let you study the material attached (KSB pamphlet). The intersection between the pump curve (provided by manufacturer ) and the system curve ( Head Vs Flow rate calculated using Bernoulli equation ) is the operating point.

At each pump curve intersection, the flow and TDH is fixed. Different pumps that operate with different pump curves will all operate along the system. Curve A represents 2-inch, Curve B 1. A pump curve is developed for each pump based on its design, pump spee and impeller diameter. It plots the head pressure produced by the pump as a function of flowrate through the pump.

There may be a large flow difference between the two points. For example, the pump head curve initially intersects the system curve at 3gallons per minute (gpm), but the head (pressure) also corresponds to a point at 1gpm. The true system head-capacity curve not only permits the accurate determination of the current pump. Knowing how to read a centrifugal pump curve is essential to the health of your system. Running too far out on the curve , or too far back, can cause damage to the pump , excessive energy consumption, and overall poor performance.

Jordan, an Application Engineer at Crane Engineering, explains how to read a centrifugal pump curve in the video below. Hope those documents can support your work. Doceri is free in theapp store.

When a system consists of mostly frictional resistance, it is termed a steep system curve. Proper low pressure sewer system design requires minimizing retention time and friction losses while maintaining adequate scouring velocities.

They are graphical representations of the energy required to move a given flow rate through a piping system and are used to identify some of the necessary characteristics of the system ’s pump. System curves are performance curves of piping systems. The required energy is plotted on the vertical axis and is given in terms of head.

The process of selecting centrifugal pumps in pumping stations for potable, sewage and storm water requires the designer to analyze several aspects, of a hydraulic nature, that depend not only on the pump ’s characteristic curve but also on the characteristic curve of the pipeline system against which pumping is performed. Clarus offers sustainable environmental products, solutions, and services for the collection, treatment, and dispersal of residential and community wastewater. This curve is the system curve , and it naturally looks like a parabola. This is, in general, true for all fluid systems without any type of controls response (acting under natural behavior). You can plot this curve on top of the pump curve , and find out where the system will reach equilibrium.

This would be true if the system -head curve were flat. The dP taken by the control valve is simply the difference between your pump head curve and the system resistance curve. If the pump is putting out 1psig at the new flow and the system resistance curves says you need psi to get the new flow through the system , the control valve takes the difference or psi.