The operating procedure of diesel centrifugal pump should be as follows: First, open all the inlet valves, close the outlet valve, start the engine, and then gradually open the outlet valve to adjust the flow to the desired level once the engine speed is normal.
Operating Method of Centrifugal Pump: The operation of the centrifugal pump can be divided into three steps: starting, running, and stopping.
I. Starting: Before starting, the following preparations should be made:
(1) Check the integrity of the pump equipment.
(2) The oil level in the bearing is normal and the oil quality is qualified.
(3) Open all the inlet valves of the centrifugal pump.
(4) Fill the pump with water or use a vacuum pump to introduce water (excluding backflow). Open the vent valve to drain the air.
(5) Check the leakage of the shaft seal. The packing seal should have a slight dripping.
(6) The motor rotation direction is correct. After completing the above preparations, the engine can be started. Once the engine speed is normal, check the pressure and speed, and pay attention to any vibration and noise. Once everything is normal, gradually open the outlet valve and adjust the flow to the desired level, and pay attention to the time of closing the valve and running without load not exceeding 3 minutes.
II. Running: During the operation period, the main task is to make rounds of inspection, the inspection content includes the following three aspects:
1. Inspection of bearings
(1) The bearing temperature cannot be too high. (2) The bearing housing must not be exposed to water, impurities, and the oil quality must not be emulsified or blackened.
(3) For pumps with an oil chamber, the oil level should not be lower than the center line of the oil mark.
(4) Is there any unusual noise? Rolling bearing damage usually results in abnormal sounds.
2, Vacuum gauge and pressure gauge are normal:
(1) The pointer of the vacuum gauge should not swing too much. If it swings too much, it may be that the material at the pump inlet is vaporizing. In addition, the vacuum gauge reading cannot be too high. If it is too high, it may be that the inlet valve is blocked, stuck, or the water level in the suction tank has dropped.
(2) The pressure gauge reading at the pump outlet is too low. This is because the pressure in the pump chamber is low. The possible reasons for this are that the pump chamber has gas (the reason for the pump chamber having gas may be that the seal ring, guide vane sleeve is seriously worn; the clearance between the impeller and rotor is too large.) The outlet valve is opened too wide, the flow rate is large, and the head is low will also cause the pressure in the pump chamber to be low.
3, The mechanical seal is working normally:
(1) The mechanical seal should not leak normally when operating.
(2) For those with cooling water devices, check whether the water flow is normal.
III. Stopping the pump:
1. When stopping a centrifugal pump, the outlet valve should be closed first to prevent the back valve from malfunctioning and causing the liquid pressure in the outlet pipe to flow back into the pump, causing the impeller to rotate in the opposite direction and causing pump damage. 2. When the pump is shut off, if the engine speed is lowered and the pump immediately stops, it indicates that there is friction, blockage, or eccentricity within the pump.
