Changes in flow and head of ordinary chemical process centrifugal pumps
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This post was last edited by 3983596_FPPZ on 2019-3-5 at 12:48. What happens to the head when the flow rate increases? Does it change? Seeking advice from fellow sailors
Adjustment valves are used. Flow rate increases while head decreases. The speed is increased using variable frequency, resulting in an increase in flow rate and head pressure
The poster can take a look at the performance curve of the pump; under normal conditions, as the flow rate increases, the head decreases.
Oh, okay. I’m not very familiar with mechanical pumps; I feel that flow rate and head aren’t closely related, which makes me confused
Oh, okay. I’m not very familiar with mechanical pumps; I feel that flow rate and head aren’t closely related, which makes me confused
Power equals = flow rate * resistance!
The flow rate increases while the head decreases. You can take a look at the design curve
You can refer to the performance curve of this pump, which is usually provided by the manufacturer. Furthermore, it is best not to use the pump with the valve fully open
We often talk about the performance curve of pumps; each pump’s official documentation comes with a corresponding performance curve graph. So what is a performance curve, and how do we interpret such graphs? Definition: When the rotational speed n is constant, the functional relationships between parameters such as head (H), shaft power (N), efficiency (η), and NPSHr as they vary with flow rate (Q) are established. When these equations are represented by curves, such curves are known as the characteristic curves of the centrifugal pump.
As flow rate increases, head decreases – this is the principle behind the size of the outlet pipe.