Solution to insufficient pressure of multi-stage centrifugal pump
Insufficient pressure in multistage centrifugal pumps is a common problem that may be caused by a variety of factors. Here are some common solutions based on authoritative information from multiple sources:
1. Check and adjust the motor
Motor power: The pressure of a multistage pump is proportional to the motor power. If the motor power is insufficient, it will affect the pressure of the pump. Check whether the motor power meets the requirements. If it is insufficient, replace it with a motor with a higher power.
Motor status: Long-term operation may cause the motor to overheat and reduce its output power. Strengthen daily maintenance to avoid motor overheating and ensure that the motor is in good working condition.
2. Check and repair the pump impeller
Impeller damage: The pump impeller is the core component of the multistage pump. If the impeller is damaged (such as broken blades) or blocked, it will affect the water discharge capacity of the pump and thus reduce the pressure of the pump. Check and repair the pump impeller in time to ensure the normal operation of the impeller.
Impeller blockage: Impeller blockage may be caused by particulate matter entering the impeller, resulting in a smaller gap between the impeller and the pump casing, affecting the flow of water. For impellers that have been blocked, they need to be cleaned or replaced in time.
3. Check and adjust the valve
Inlet valve: The opening of the inlet valve directly affects the water supply of the multistage pump. If the opening is insufficient or the closure is not tight, the pressure of the multistage pump will drop. Adjust the opening of the inlet valve to ensure that the valve is in normal working condition, and regularly check and maintain the valve to eliminate problems such as valve leakage and rust.
Outlet valve: By adjusting the opening of the outlet valve, the flow and head of the pump can also be changed, thereby adjusting the corresponding pressure.
4. Check and clean the pipeline system
Pipeline resistance: The resistance of the pipeline system will affect the actual working head of the multistage pump. When the resistance is too large, the working head of the multistage pump cannot meet the demand, resulting in a drop in pressure. Excessive pipeline resistance may be caused by pipe bending, pipe fitting damage, and scaling of the inner wall of the pipe. Clean the pipeline system to reduce resistance; for problems such as pipe bending and damage, repair or replace them in time.
5. Check and replace other key components
Shaft seal and sleeve: Shaft seal damage or sleeve wear and excessive clearance may cause pressure reflux and affect the pressure of the pump. Check and replace damaged shaft seals and sleeves.
Pump impeller: If the above methods are ineffective, you can try to replace the pump impeller. Select a suitable pump impeller and change the head and flow rate by increasing or decreasing the number of blades to adjust the corresponding pressure. The pump impeller needs to be selected according to the pump model and parameters, otherwise it will affect the operating efficiency of the pump.
5. Other considerations
Pump type selection: Make sure that the model of the selected multi-stage centrifugal pump meets the production requirements to avoid insufficient pressure caused by model mismatch.
System inspection: Before making any adjustments or replacing parts, a comprehensive inspection and analysis of the system is required. Check the conditions of the pump body, valves, pipes, motors and other parts to ensure that the system is not blocked, leaking, rusting and other problems.
Professional maintenance: If the above methods cannot solve the problem, it is recommended to seek the help of professional engineers or technicians for more in-depth diagnosis and maintenance.
