The pressure and flow at the outlet of the centrifugal pump, as well as the relationship between the flow rate, head, and those values indicated on the nameplate at that time
Thread Content
What is the relationship between the pressure and flow rate at the oil pump’s outlet and those specified on the nameplate? What is the relationship between the actual head and power of the oil pump and those indicated on the nameplate? I hope someone experienced can help me analyze this
The outlet pressure and flow rate indicated on the pump nameplate are generally parameters based on water as the medium, and there is a certain difference between these values and the actual outlet pressure and flow rate; it is necessary to take into account the density of the medium under operating conditions.
According to the flow rate, the performance curve of the pump can be determined; the random data for each pump includes its performance curve, and the pump’s outlet pressure is the pressure resulting from the conversion of head value plus the pump’s inlet pressure. In short, compared to the pump’s rated flow rate (the value indicated on the nameplate), the lower the flow rate, the higher the pressure at the pump outlet. Pumps are rarely operated beyond their rated flow rate; when this does happen, it is mainly determined by whether the motor current exceeds its limit.
I mean, why is the pressure and flow rate at the oil pump outlet always lower than those indicated on the nameplate? The same is true for head and power
The nameplate indicates the design pressure and flow rate, which are the maximum values allowed; it’s normal for the actual values to be lower than these
The outlet pressure and flow rate indicated on the pump nameplate are generally parameters based on water as the medium, and there is a certain difference between these values and the actual outlet pressure and flow rate; it is necessary to take into account the density of the medium under operating conditions.
Basically, the parameters on the nameplate represent the operating performance of the pump. For example, in terms of flow rate, if the actual flow rate is higher than that indicated on the nameplate, there are basically two possibilities: 1) the system shuts down due to overcurrent, 2) the head pressure cannot be achieved
Everything on the nameplate is based on water as the medium, and in reality those conditions cannot be achieved.
The nameplate indicates the design pressure and flow rate, which are the maximum values permitted
The flow rate and head indicated on the nameplate represent the optimal pressure and flow rate for the pump’s design; within the performance curve range of this pump, the valves in the outlet pipeline can be used to adjust the desired flow rate and pressure.
The value on the nameplate is the rated value, that is, the design value. As taught in junior high school physics, the actual value should be within a certain range below the rated value