Three Inch Four Stroke Centrifugal Pump

Start up a. Centrifugal pump check before starting Lubricant's name, model, main performance and refill quantity meet the requirements of technical documents; Whether the bearing lubrication system, sealing system and cooling system are in good condition, and whether the oil and water lines...

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a. Centrifugal pump check before starting

Lubricant's name, model, main performance and refill quantity meet the requirements of technical documents;

Whether the bearing lubrication system, sealing system and cooling system are in good condition, and whether the oil and water lines of the bearing are unblocked;

Rotate the rotor of the pump 1~2, check whether the rotor has friction or stuck phenomenon;

In the vicinity of the coupling or belt guards, etc., are there any obstacles that prevent rotation;

The foundation bolts of the pump, bearing seat and motor are loose;

The valve or attachment of the pump working system shall be in the position where the load of the pump is at a minimum, and the outlet regulating valve shall be closed;

Jog the pump to see if the impeller steering is consistent with the design steering. If it is not consistent, it is necessary to make the impeller completely stop rotating and adjust the motor wiring before starting again.

 

b. Centrifugal pump filling

Before the pump is started, the pump housing and the suction pipe must be filled with water. This is because the pump inlet vacuum cannot be formed and maintained in the presence of air.

 

c. Centrifugal pump warm pump

Multi-stage centrifugal pumps conveying high-temperature liquids, such as boiler feed pumps for power plants, must be warmed prior to start-up. This is because when the feed pump is started, high-temperature feedwater flows through the pump, causing the pump body temperature to rapidly increase from room temperature to 100 to 200°C. This can cause temperature differences between the inside and outside of the pump and the components, if not long enough. Heat transfer time and proper control of temperature rise will cause uneven expansion of the pump, resulting in deformation, wear, vibration and shaft bearing accidents of various parts of the pump body.


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