Common troubleshooting skills of pumps, more importantly, to master the troubleshooting skills of pumps, you must know the working principle of the pump, the structure of the pump, and the necessary operating skills and common sense of mechanical maintenance. can quickly determine the fault location.
High Head Self-Priming JET Pump troubleshooting and treatment skills are as follows:
1. The pump is stuck. The treatment method is to check the coupling by hand, disassemble and check if necessary, and eliminate the failure of the dynamic and static parts.
2. The pump does not discharge liquid, and the pump is insufficiently filled (or the gas in the pump is not exhausted). The treatment method is to refill the pump;
The pump is not turning right. The processing method is to check the rotation direction;
The pump speed is too low. The treatment method is to check the speed and increase the speed;
The filter screen is clogged and the bottom valve does not work. The treatment method is to check the filter screen to eliminate sundries;
The suction height is too high, or there is a vacuum in the suction tank. The solution is to reduce the suction height; check the suction tank pressure.
3. The pump is interrupted after draining, the reasons and treatment methods, and the suction pipeline leaks. The treatment method is to check the suction side pipeline connection and the sealing condition of the stuffing box:
When filling the pump, the gas on the suction side is not exhausted. The treatment method is to ask to refill the pump;
The suction side is suddenly blocked by a foreign object. The treatment method is to stop the pump to deal with foreign bodies;
Inhale a lot of gas. The treatment method is to check whether there is a vortex at the suction port and whether the submerged depth is too shallow.
4. Insufficient flow, causes and treatment methods, and the static lift of the system increases. The treatment method is to check the liquid height and system pressure;
Increased drag loss. The treatment method is to check obstacles such as pipelines and check valves;
Excessive wear on the casing and impeller wear rings. The treatment method is to replace or repair the wear ring and impeller;
Leakage from other parts. The treatment method is to check the shaft seal and other parts;
The pump impeller is clogged, worn, corroded. The treatment method is cleaning, inspection and replacement.
5. The head is not enough, the reason and the treatment method, the impeller is installed in reverse (double suction wheel). The treatment method is to check the impeller; liquid density,
Viscosity does not match design conditions. The treatment method is to check the physical properties of the liquid;
The flow is too large during operation. The solution is to reduce traffic.
6. Pump vibration or abnormal sound, causes and treatment methods. The vibration frequency is 0~40% of the working speed. Excessive bearing clearance, loose bearing bush, impurities in the oil, poor oil quality (viscosity, temperature), oil foaming due to air or process liquid, poor lubrication, bearing damage. The treatment method is to take corresponding measures after inspection, such as adjusting the bearing clearance, removing impurities in the oil, and replacing the new oil;
The vibration frequency is 60%~100% of the working speed, or the seal gap is too large, the retainer is loose, and the seal is worn. The treatment method is to check, adjust or replace the seal; the vibration frequency is 2 times the working speed, misalignment, loose coupling, sealing device friction, housing deformation, bearing damage, support resonance, thrust bearing damage, shaft bending, poor fit . The treatment method is to check, take corresponding measures, repair, adjust or replace; the vibration frequency is n times the working speed. Pressure pulsation, misalignment, shell deformation, seal friction, bearing or foundation resonance, pipeline, machine resonance; reinforcement of foundation or pipeline; very high vibration frequency. Shaft friction, seals, bearings, imprecision, bearing jitter, poor shrink fit, etc.
7. The causes and treatment methods of bearing heating, the scraping and grinding of bearing pads are not satisfactory. The solution is to re-repair or replace the bearing pads.
The bearing clearance is too small. The treatment method is to re-adjust the bearing clearance or scrape;
The amount of lubricating oil is insufficient and the oil quality is poor. The treatment method is to increase the amount of oil or replace the lubricating oil;
Poor bearing assembly. The treatment method is to check the bearing assembly as required to eliminate unsatisfactory factors;
The cooling water is disconnected. The treatment method is inspection and repair;
Worn or loose bearings. The treatment method is to repair the bearing or scrap it.
If the association is loose, re-tighten the relevant bolts; the pump shaft is bent. The treatment method is to correct the pump shaft;
The oil slinger is deformed, the oil slinger cannot rotate, and it cannot carry oil. The treatment method is to update the oil slinger;
Poor alignment of the coupling or too small axial clearance. The treatment method is to check the alignment and adjust the axial clearance.
8. The shaft seal is hot, the reason and the treatment method The packing is too tight or friction. The treatment method is to loosen the packing and check the water seal pipe;
The water seal ring and the water seal pipe are dislocated. The solution is to recheck the alignment;
Poor flushing and cooling. The treatment method is to check and flush the cooling circulation pipe;
The mechanical seal is faulty. The treatment method is to check the mechanical seal.
9. The reasons for the large rotor movement and the treatment methods are as follows. Improper operation, and the operating conditions are far from the design conditions of the pump.
Treatment method: operate strictly so that the pump always runs near the design conditions;
Unbalanced. The treatment method is to clear the balance pipe;
The material of the balance disc and the balance disc seat is not up to the requirements.
The treatment method is to replace the balance disc and balance disc seat with materials that meet the requirements.
Post time: Jun-24-2022