Maintenance method of centrifugal pump

The daily maintenance of centrifugal pump is an important guarantee for the safe and reliable operation of centrifugal pump Only when the centrifugal pump is operated in a good state of equipment, can it give full play to the efficiency of the equipment and ensure the normal production needs (1) before start-up, check the integrity and cooperation of the equipment, fastening of the fastening bolts, lubrication of the bearing (oil shall be added if the lubricating oil is insufficient and replaced if the lubricating oil is deteriorated), leakage of the sealing device, make the pump body full of liquid, and close the outlet valve (2) pay attention to and check the operation of the pump at any time during the start-up Often check the temperature change of the bearing, whether there is noise and vibration, whether the motor is heated (not more than 80 ℃), whether the motor load is normal, and whether the sealing surface leaks, etc If any problem is found, it shall be shut down for maintenance immediately (3) close the outlet valve before shutdown, and then shut down If in winter, after the shutdown, the water in the pump and the pipe shall be discharged to avoid freezing the centrifugal pump (4) regular maintenance Generally, centrifugal pump shall be overhauled once every 6-12 months (combined with equipment overhaul) During maintenance, disassemble the pump, thoroughly clean the impeller, bearing, shaft and sleeve, water seal pipe, stuffing box, pump shell, etc After cleaning, if the bearing is found to be worn, cracked, loose, and the ball has pockmarks, the new bearing shall be replaced, and if it is intact, the new lubricating oil shall be replaced; if the shaft and shaft sleeve are worn, they can be repaired by welding, repaired and re ground; if the shaft is bent, they shall be straightened; if the impeller is worn or corroded, they can be repaired or replaced (balance test shall be conducted again after repair); the sealing box shall be replaced with new packing After regular maintenance and assembly, the test run shall be carried out again (5) conditions for emergency stop of pump A sudden strong vibration or clear metal friction sound in the pump B when the bearing smokes or the temperature rises sharply to 75 ℃, and the oil filling is invalid C when the high-pressure pipeline breaks and threatens the safety of people or equipment D the motor is smoking or on fire E in case of sudden vaporization or loss of water, sharp drop of outlet pressure and current, and large swing.