Overlaying the system curve on the pump curve indicates how the pump will perform given a specific flow rate and head pressure, depending on the position of the pump control valve and the impeller diameter. Understanding the information communicated by each part of the curve is critical to ensuring that the pump selected is a good fit for the application’s hydraulics. The best operating conditions will in general be close to the Best Efficiency Point - BEP. The point at which the pump curve and system curve intersect on the graph indicates the pump’s actual operating point in that particular system. The intersection of system curve and pump curve may not match the manufacturer's published curve for several reasons, including worn or incorrectly set clearances, a liquid with viscous properties (fluids other than water), or a different speed or diameter. A pump curve and system curve do not have to intersect, as in the case where the system curve has a high static head, say 100 ft, but the pump has a shutoff head of only 50 ft. Oh wait, it intersects when the pump is in reverse flow! Best Efficiency Point - BEP . Therefore in these cases, the intersection between the system head curve and combined pump curve is not the operating point of the station.
Given the lower system head, the intersection of the H-Q curve with the system-head curve is out towards the right end of the H-Q curve at or near runout. It's possible that the "maximum flow" is not set high enough or the model is not balanced during the system curve calculations. So, you would not be able to simply add up all the flows and compare to the operating point.
Different pumps that operate with different pump curves will all operate along the system curves but at different fixed points. The corresponding head and flow are called “Rated Head” and “Rated Flow”. A system head curve is a common type of tool used in pump selection and system design and sizing. What is meant by a "system curve" that is used to determine the operating point of a pump. The main advantage of a variable speed pump is its ability to operate at many different points. It combines elements of the performance (H-Q) curve of the specific pump under consideration with the combined static, operating, and frictional loss heads (the total dynamic head or TDH) of the system under design. Multiple Speeds. RE: Pump curve doesn't cross system curve BigInch (Petroleum) 18 Jun 13 03:59 Just in time to find out that the new reduced head system curve was the result of somebody not considering connection backpressure at the end of the downstream pipeline. Pump impeller and casing wear can significantly affect pump performance when compared to the original conditions that produced the factory pump curve. In the pump vs. system curve for this model in Figure 5, you can easily see that the pump and system curves intersect at the operating point of 500 gpm (113.6 m^3/hr) and 381 ft (116 m). I'd recommend contacting technical support.
Head, the QH-curve The QH-curve shows the head the pump is able to perform at a given flow. 2: The curves for power consumption and efficiency will normally only cover the pump part of the unit – i.e.,P2 and ηP. This chart shows how a basic performance curve of a variable speed pump will intersect the system curve at different speeds expressed in RPM. To read about pump performance curve Click Here.
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Given the lower system head, the intersection of the H-Q curve with the system-head curve is out towards the right end of the H-Q curve at or near runout. It's possible that the "maximum flow" is not set high enough or the model is not balanced during the system curve calculations. So, you would not be able to simply add up all the flows and compare to the operating point.
Different pumps that operate with different pump curves will all operate along the system curves but at different fixed points. The corresponding head and flow are called “Rated Head” and “Rated Flow”. A system head curve is a common type of tool used in pump selection and system design and sizing. What is meant by a "system curve" that is used to determine the operating point of a pump. The main advantage of a variable speed pump is its ability to operate at many different points. It combines elements of the performance (H-Q) curve of the specific pump under consideration with the combined static, operating, and frictional loss heads (the total dynamic head or TDH) of the system under design. Multiple Speeds. RE: Pump curve doesn't cross system curve BigInch (Petroleum) 18 Jun 13 03:59 Just in time to find out that the new reduced head system curve was the result of somebody not considering connection backpressure at the end of the downstream pipeline. Pump impeller and casing wear can significantly affect pump performance when compared to the original conditions that produced the factory pump curve. In the pump vs. system curve for this model in Figure 5, you can easily see that the pump and system curves intersect at the operating point of 500 gpm (113.6 m^3/hr) and 381 ft (116 m). I'd recommend contacting technical support.
Head, the QH-curve The QH-curve shows the head the pump is able to perform at a given flow. 2: The curves for power consumption and efficiency will normally only cover the pump part of the unit – i.e.,P2 and ηP. This chart shows how a basic performance curve of a variable speed pump will intersect the system curve at different speeds expressed in RPM. To read about pump performance curve Click Here.
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