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No.1 Operating Conditions Deviate From Design Parameters
In general, centrifugal pumps have a continuous downward performance curve, and the flow rate gradually increases with the decrease of the head. During the operation, due to the matching of the device, the outlet pressure of the pump decreases, and the working point of the pump passively shifts to the low-lift and high-flow point with the device curve, which will cause the head to decrease. In fact, this is due to external factors such as the device. It is caused by the change and has no special relationship with the performance of the pump itself. At this time, as long as the head of the system device is changed, such as closing a little outlet valve, the problem can be solved.
No.2 Speed Change
影响泵头th的重要因素雷竞技官网最新版at the outer diameter of the impeller is related to the actual operating speed of the pump. When other conditions remain unchanged, the pump head is proportional to the square of the speed. It can be seen that the speed has a great influence on the head. , Sometimes the speed of the pump is reduced due to some external reason, and the head of the pump will be reduced accordingly. At this time, you should check whether the speed of the pump is consistent with the design. If there is a problem with the speed, you should check the cause and solve it reasonably.
No.3 Cavitation Occurs At Inlet
If there is a problem with the suction port pressure of the pump (the effective NPSH is too low), it is lower than the saturated vapor pressure of the pumped medium, and the actual operating conditions of the pump deviate greatly, and cavitation will form. At this time, check whether the inlet pipeline system is blocked or whether the opening of the inlet valve is too small, and whether the conveying medium and the head of the device meet the design requirements of the working conditions.

No.4 Internal Leakage Occurs
当转动部分和sta之间的差距tionary part in the pump exceeds the design range, it will cause internal leakage, which is reflected in the drop of the discharge pressure or the flow rate of the pump, such as the gap between the impeller ring and the gap between the stages of the multi-stage pump. At this time, corresponding dismantling and inspection should be carried out to repair or replace the parts that cause the excessive gap.
No.5 Impeller Channel Or Inlet Pipe Is Blocked
If part of the flow path or the inlet pipe of the impeller suction port is blocked, it will affect the work of the impeller, resulting in a drop in outlet pressure and flow rate, which will lower the vibration of the pump. Therefore, it is necessary to disassemble the pump and check to remove foreign matter or whether the inlet pipeline is blocked. In order to prevent this problem from recurring, a filtering device can be added before the pump inlet if necessary.