The importance and feasibility of equipment turning
Thread Content
As winter sets in, most chemical plants in the north require that all pumps be rotated more frequently to prevent problems, but the failure rate of mechanical seals increases significantly during winter； Question: 1. One pump is in operation while another serves as a backup; the backup pump must be in a ready state for use. If it is not in such a state, the pump may freeze and get blocked ； 2. For oil transfer, one pump is in operation while another serves as a backup; the pumps do not have heating, and in winter the mechanical seal rings of the idle pumps contract, resulting in an increased leakage rate ； At the same time, trace amounts of water in the oil can cause damage to the static ring during shaft turning ； 3. The purpose of turning the pump shaft is to prevent it from bending when the pump is stopped; regular rotation of the shaft ensures that no deformation occurs ； But for small pumps, motors below 15KW, is it necessary to turn the shaft? 4. Nowadays, operators and maintenance workers, due to the widespread use of intelligent testing instruments, have relatively weaker practical skills as well as experience in listening, observing, touching, and smelling ； Actual cranking increases the equipment failure rate ； Sea friends, what do you do?
It is essential to maintain spare equipment and ensure they are in good condition; this is a prerequisite when turning the gears
Equipment maintenance is necessary; in winter, protection against freezing is required, and the equipment should be turned manually at regular intervals
Equipment maintenance is necessary; idle equipment should be inspected regularly
There is a question: Is the backup pump always in standby mode? Pump A operates, and when it fails, Pump B starts; once Pump A is repaired, Pump B stops and Pump A starts again. Still, the two pumps operate in a fixed alternating manner: Pump A runs for 3 months, followed by Pump B running for 3 months
For a device like a small pump, it depends on the management requirements of one’s own company; if there are no specific requirements, then the decision should be based on the actual operating conditions and the properties of the medium involved. I have several such devices; the medium inside contains catalyst particles, and once they start operating, they keep running until the mechanical seal is damaged. Because whenever there is a switch, even if no leakage occurs when it’s not in use, it’s not guaranteed that it will remain intact when used as a backup; solid particles can accumulate on the mechanical seal, and once operation stops, the seal gets damaged.
One must be practical when working with such devices; the small pump has a relatively short shaft, and in winter, as long as freezing is prevented, it can be rotated once a week. This is how we carry it out.
The turning of the standby pump shaft serves three main purposes: one is to prevent shaft deformation； Second, lubricate the bearings during the shaft turning process ； Third, check the standby pump for any obvious abnormalities such as noise or jamming, to ensure it is in good condition and ready for use. When switching between A/B pumps, the condition of the medium being transported must also be taken into account; frequent switching is not advisable in situations where the medium has high viscosity or contains a lot of particulates
This post was last edited by sdwfsgyykai on 2018-6-14 10:29; it is necessary to carry out when performing routine maintenance on the drive shaft； To prevent operators from engaging in fraud, turntable operation records can be kept (it is recommended to use red for odd-numbered days and yellow for even-numbered days); daily handovers are carried out, and managers can check the records at any time to compare them with the actual situation on site
There are marks on the shaft here; the machine must be turned daily! Regular turning of large units! Additionally, here under normal circumstances, the main pump runs continuously as long as it is functioning properly, while the backup pump is operated under load on a regular basis for a certain period of time! Based on my work experience, pumps that start and stop frequently are more likely to break!