What are the reasons for shaft seizure in pumps?

Due to the lack of a lubricating and cooling medium, as well as prolonged operation, the bearings overheat and deform, which hinders normal operation; furthermore, the motor causes the shaft to break. Enhance inspections, and promptly isolate for inspection upon detecting any abnormalities. Strengthening the cranking of backups and pumps allows for the early detection of jamming issues, enabling timely resolution.

There are specialized rotating machinery monitoring systems available for such monitoring.

It is usually caused by poor lubrication or impurities in the lubricant.

Two aspects. Strengthen inspections and patrols, and carry out maintenance and repairs as required

When a pump is in operation, if the shaft and bearings come into direct contact, instantaneous high temperatures and pressures are generated at the point of contact. The high temperature results from the heat generated by friction, while the high pressure is caused by the rotor’s weight and its radial loads being borne over a very small contact area. Under these conditions of high temperature and pressure, adhesion occurs at the contact point; as the shaft continues to rotate, this adhesion is broken apart, resulting in an even rougher metal surface. This makes it more likely for the bearings and shaft to come into direct contact at certain points. This cycle of adhesion, separation, adhesion again, and separation again can cause the temperature of the friction surfaces to rise rapidly, leading to damage. This is what is commonly referred to as shaft seizure or bearing burnout. High speeds and heavy loads, improper clearance, and insufficient oil volume – these factors that prevent the formation of a flowing oil film are the causes of shaft seizure incidents.

This usually occurs when there is a problem with the lubrication system, causing the pump to operate for an extended period without lubricant; as a result, the bearing temperatures rise and cause deformation!

The key is to carry out proper daily maintenance, strengthen inspections, and conduct regular checks and repairs

Regular inspections are very necessary.

There is a problem with the lubrication system, or the bearings are faulty

Phenomena, causes, and handling of pump shaft seizure: a. Phenomena: a) High temperature in the bearing housing. b) Abnormal noise from the pump, with severe vibration. c) The lubricating oil contains metal debris. d) The current increases, and the motor trips. b: Reason: a) The fuel tank is low on fuel or empty. b) The quality of the lubricating oil is substandard, containing impurities or being water-emulsified. c) Interruption or insufficient cooling water, resulting in excessive bearing temperature. d) Poor quality of the bearings themselves or fatigue aging due to prolonged operation. c: Handling method: Upon detecting the above phenomenon, switch to the backup pump promptly, stop the operating pump, and notify the control room at the same time ； Contact a blacksmith to handle it.