Positive Displacement Pump.
System Curve and Pump Performance Curve. The System Curve. A fluid flow system is characterized with the System Curve - a graphical presentation of the Energy Equation. The system head visualized in the System Curve above is a function of elevation - or the static head and the major and minor losses in the system and can be expressed as: h = dh + hl (1)whereh = system head (m)dh = h. A generic expression of major and minor head loss is: hl = k q. Increasing the constant - k - by closing some valves, reducing the pipe size or similar - will increase the head loss and move the system curve upwards. The starting point for the curve - at no flow, will be the same.
Pump Performance Curve. The pump characteristic is normally described graphically by the manufacturer as the pump performance curve. The pump performance curve describes the relation between the flowrate and the head for the actual pump.
Other important information for a proper pump selection is also included - like efficiency curves, NPSHr curve, pump curves for several impeller diameters and different speeds, and power consumption. Increasing the impeller diameter or speed increases the head and flow rate capacity - and the pump curve moves upwards. The head capacity can be increased by connecting two or more pumps in series, or the flow rate capacity can be increased by connecting two or more pumps in parallel. Selection of Pump.
The proper pump can be selected by combining the System Curve and the Pump Curve: The operating point is where the system curve and the actual pump curve intersects. Best Efficiency Point - BEPThe best operating conditions will in general be close to the Best Efficiency Point - BEP. Special considerations should be taken for applications where system conditions frequently changes during operation - like applications for heating and air conditioning systems or water supply systems with variable consumption and modulating valves.
Carry Out. When a pumps operates in the far right of its curve with poor efficiency - the pumps Carry Out. Shutoff Head. The Shutoff Head is the head produced when the pump operates with fluid but with no flow rate. Churn. A pump is in Churn when it operates at shutoff head or no flow.
Knowing how to read a pump curve is essential to understanding your equipment and being able to troubleshoot issues as they arise. The head of a pump is read in. Ideally a pump would run. Pump curve minimizes changes in flow through a given zone circuit as other zone valves open and close (see TD01, When Zone Valves Close,for additional information). Pump Selection Handbook. Let’s Talk About Pumps How many pumps do you own? Understanding Pump Curves Presenter: Michael Stroh. Understanding VFD Curves. CENTRIFUGAL PUMP SELECTION, SIZING, AND INTERPRETATION OF. SIZING AND INTERPRETATION OF PERFORMANCE CURVES. How to Read Pump Curves. Compare the total head of the system to the pump curve chart. Read across the horizontal axis and find the system plan's.
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Of Centrifugal Pump Operation C. As can be seen from the pump curve, the pump has a spe-ci How to Read Pump Curves & What They Mean by Jason Fletcher, PE, Project Engineer The key thing to remember when reading a pump curve is all curves are based upon.
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