Pump System Curve
Pump system curve represents the resistance offered by the system id est., the pressure developed by the pump is high enough to beat the resistance offered by the system. This pressure is additionally known as as “Total Head”. the whole head is that the addition of 2 parts. They are
- Static Head
- Friction Head
Static Head
Friction HeadPump system curve
Static head
Static head is that the distinction tall between the beginning elevation of pumping liquid to the destination of pumping liquid to be wired. The Static head as 2 parts. they’re the Static suction head (Hs) and Static discharge head (Hd)
Static suction head (Hs)
The Static suction head refers the lifting the liquid relative to the pump centerline. The Static suction head is positive if the liquid level is on top of the pump centerline, and negative if the liquid level is below the pump centerline.
Static discharge head (Hd)
The Static discharge head refers to the vertical distance between the pump centerline and therefore the surface of the liquid within the destination tank or vessel. As we have a tendency to seen from the figure and curve, the Static Head is a freelance of flow.
The static head is calculated by mistreatment the below formula
Friction head (hf)
The friction head is that the resistance loss because of the pipes, valves and pipe fittings. Friction head is additionally known as “Dynamic head loss”.
The total system head maybe an add of static head and friction head as shown the ultimate curve.
Pump performance curve
The pump performance curve is painted the whole head within the coordinate axis and therefore the flow within the coordinate axis, which is diagrammatically shown within the below pump characterisic function. As per the curve, the top step by step decreases with increasing flow.
Pump operative purpose
When we merge each the system curve and pump curve as shown within the below figure. The intersection of the system curve and pump curve is termed as pump operative purpose. The corresponding head and flow area units are known as “Rated Head” and “Rated Flow”.
As the resistance of a system will increase, the top will increase. This, in turn, causes the flow to decrease and can eventually reach zero. A zero flow is just acceptable for a brief amount while not inflicting to the pump to break down.
Important of the system curve
An error within the system curve calculation is additionally possible to steer to a wrong choice of pump. On the opposite hand, if we have a tendency to add additional safety margins to the calculated system curve, then the pump choice results in an associate outsized pump. therefore additional attention shall provide to system curve calculation.
Unlike static head, the friction head depends on flow and property of the liquid. unremarkably the friction head is proportional to the sq. of the flow.
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