What should you pay attention to before starting the centrifugal pump?
(1) Preparation before starting
a. Check before starting The name, model, main performance and filling quantity of the lubricating oil meet the requirements of the technical documents;
Whether the bearing lubrication system, sealing system and cooling system are in good condition, and whether the oil passage and waterway of the bearing are unblocked;
Turn the rotor of the pump 1 to 2 turns to check whether the rotor has friction or jam;
Whether there is any debris that hinders the rotation near the coupling or the belt guard;
Whether the base anchor bolt of the pump, the bearing housing and the motor is loose;
The valve or accessory of the pump working system shall be in the position where the load is minimum when the pump is running, and the outlet regulating valve shall be closed;
Jog the pump to see if its impeller steering is consistent with the design steering. If it is inconsistent, the impeller must be completely stopped and the motor wiring must be adjusted before starting.
b. Water Filling Before the pump is started, the pump casing and the suction pipe must be filled with water first. This is because the vacuum of the pumping population cannot be formed and maintained in the presence of air.
c. Warm pump The pump that delivers high temperature liquid, such as the boiler feed water pump of the power plant, must be warmed up before starting. This is because when the feed water pump is started, the high temperature feed water flows through the pump, so that the temperature of the pump body rises rapidly from normal temperature to 100-200 ° C, which causes the temperature difference between the inside and outside of the pump and the components, if not long enough. The heat transfer time and the proper control of the temperature rise will cause uneven expansion of the pump, resulting in deformation, wear, vibration and bearing axle accidents of various parts of the pump body.
(2) Startup procedure
The centrifugal pump chamber and the suction pipe are all filled with water and no air, and the outlet pump is closed. The feed pump is warmed up.
For forced lubrication pumps, start the oil pump to supply oil to each bearing.
Start the cooling water pump or open the cooling water valve.
When the closing is started, the idle time of the pump after starting is not allowed to exceed 2~4min. After the speed reaches the rated value, the outlet valve of the centrifugal pump is gradually opened to increase the flow rate and reach the required load.
(3) Precautions during operation
The pump manufacturer has the temperature of the bearing. The temperature rise of the rolling bearing generally does not exceed 40 °C, and the surface temperature does not exceed 70 °C. Otherwise, it indicates that there is a problem inside the rolling bearing, and the machine should be stopped for inspection. If you continue to run, it may cause an accident. For the temperature regulation of the sliding bearing, refer to the technical documentation of the pump, the same as the rolling bearing.
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