Double-screw pump failure

1. Reasons for severe vibration or noise in the pump: The pump is not installed properly, or it is installed too high, exceeding the pump’s suction capacity； Damage to the motor ball bearing ； The water pump shaft is bent, or it is not aligned or parallel to the motor shaft ； Air leakage in the inhalation line or at the pump’s suction end ； The inhalation tubing is blocked. The solution is to secure the water pump properly or reduce its installation height, minimize the resistance in the suction pipeline, clean or replace the filter, and lower the viscosity of the medium ； Replace the motor ball bearings ； Correct the bent pump shaft or adjust the relative position of the pump and the motor ； Eliminate air leakage at the suction pipe and the pump’s suction end ； Rule out blockage in the inhalation tube. 2. Reasons for overheating of the drive shaft or motor bearings: lack of lubricant or broken bearings, etc. The solution is to add lubricant or replace the bearing. 3. Pump overheating: Severe friction in the rotating components inside the pump ； Blockage in the mechanical seal return oil port ； Oil temperature too high ； It is not installed properly; the rotating components are not aligned. The solution is to check and replace the worn parts ； Clear the return oil hole ； Appropriately reduce the oil temperature ； Adjust and correct the assembly and installation accuracy. 4. No flow output: Clogged intake line or air leakage ； The suction height exceeds the allowable suction vacuum level ； Motor reversal ； It is caused by factors such as excessive medium viscosity. Solutions include checking the inhalation pipeline, reducing the inhalation height, changing the motor direction, heating the medium, and so on. 5. Insufficient pump pressure: Is there a seal leak? ； With the equipment shut down, check whether the screw pump still has a self-sealing function by flowing water through it ； Is the selection correct? ； The pressure at the outlet is too high; let’s wait a bit. There are many problems with insufficient pump pressure and strain. The simplest thing to check is whether the inlet is blocked. Next, check the motor. If there are no problems with these two, then it’s necessary to take a look to see if the screw and bearings are damaged. 6. Decreased flow: Blockage or air leakage in the suction pipeline ； Wear of spiral sleeves and bushings ； The safety valve spring is too loose, or the valve disc does not make proper contact with the valve seat ； The motor speed is insufficient ； Installed too high; exceeds the pump’s suction capacity, resulting in shaft seal leakage. The corresponding solution should be to inspect the suction pipeline ； Replace the parts when wear is severe ； Adjust the spring, and grind the valve disc and seat ； Repair or replace the motor ； Reduce the suction height and suction line resistance ； Inspect or replace the shaft seal. 7、Severe oil leakage from the mechanical seal: incorrect installation position ； The sealing gland is not flattened ； Damage to the sealing surface of the rotating ring or stationary ring ； The dynamic or static ring seal is damaged. The solution is to reinstall it as required ； Adjust the sealing gland ； Grind the sealing surface or replace it with a new one ； Replace the sealing ring. 8. Mechanical seal overheating: Blockage in the seal fluid pipeline ； The compression amount of the mechanical seal spring is too large. The solution is to rule out faults in the sealed piping ； Reduce the spring compression. 9. Sudden increase in shaft power: Blockage in the discharge pipeline ； Severe friction between the screw and the pump casing ； The viscosity of the medium is too high ； It is not installed properly; the rotating components are not aligned. The solution is to stop the pump and clean the pipeline ； Inspect or replace the relevant parts ； Raise the temperature of the medium to reduce viscosity ； Adjust and correct the assembly and installation accuracy. 10. Shaft lock (cannot rotate): Excessive temperature causes the components inside the pump to expand excessively ； Insufficient starting torque. The solution is to cool the pump, turn it by hand, and then start it ； Check the drive mechanism.

Generally, which part gets damaged? Could you provide some detailed information?

The regions where twin-screw pumps are manufactured include Huangshan, Tianjin, and Botou in Hebei. Nowadays, most twin-screw pumps come with external lubrication; they are capable of transporting both gases and liquids. It is possible to provide details regarding the medium being transported, the origin of the pump, its model, as well as its vulnerable parts. Twin-screw pumps are relatively difficult to repair, so it is important to address any issues early on: lol

It’s usually not the bearing that’s broken, right? Be aware of the vibrations caused by damaged coupling springs; excessive vibration in twin-screw pumps can easily damage the screws ； If the amount of fluid drawn in is insufficient, it can also cause damage to the screw; in such cases, it is necessary to check the inlet filter and the fluid itself to ensure there are no large amounts of impurities present ；