How to understand slurry pump performance curve?
DO PUMP is a professional manufacturer of heavy duty slurry pump, vertical slurry pump, submersiible slurry pump, as well as submersible sand pumps. Submersible sand pumps are also known as submersible dredging pumps, submersible slurry pumps, submersible heavy medium pumps, hydraulic submersible sand pumps, and electric submersible sand pumps.
The characteristic curve of a slurry pump is a set of curves drawn by plotting data such as Q, H, N, and η measured by experiments. This drawing is provided by the pump manufacturer for reference when selecting the pump and operating the department.
Different pump models have different characteristic curves, but they all have the following three curves:
(1) H-Q line shows the relationship between pressure head and flow;
(2) The N-Q line represents the relationship between pump shaft power and flow;
(3) η-Q line represents the relationship between pump efficiency and flow;
(4) The characteristic curve of the pump is measured at a certain speed, so the value of speed n is noted on the characteristic curve graph.
The highest efficiency point on the characteristic curve of a slurry pump is called the design point, and the pump works most economically at the pressure head and flow rate corresponding to this point. The performance parameters marked on the nameplate of the slurry pump are the working condition parameters at the highest efficiency point.
The performance curve of the slurry pump can be used as the basis for selecting the pump. After determining the type of pump, select the pump according to the flow rate and pressure head.
Example 2-2 Use clean water to determine the main performance parameters of a slurry pump. In the experiment, the measured flow rate is 10m3/h, the reading of the pressure gauge at the pump outlet is 0.17MPa (gauge pressure), the reading of the vacuum gauge at the inlet is -0.021Mpa, the shaft power is 1.07KW, and the motor speed is 2900r/min. The vertical distance between the pressure measuring point of the vacuum gauge and the pressure measuring point of the pressure gauge is 0.2m. Try to calculate the lift and efficiency of this at the experimental point.
The main performance parameters of the solution pump include speed n, flow Q, head H, shaft power N and efficiency. The directly measured parameters are
Speed n=2900r/min
Flow rate Q=10m3/h=0.00278m3/s
Shaft power N = 1.07KW
The calculations are head H and efficiency.
