Before starting the centrifugal pump, you need to pay attention to the following aspects:
a. Pre-start check
Whether 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 a position where the load is small 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. Filling water
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
Pumps that transport high-temperature liquids, such as boiler feed pumps in power plants, 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.
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