Regarding the issue of reversing a centrifugal pump
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I just started working at the chemical plant this year, and I would like to ask how to transfer liquids using a pump There is also the role of the sealing water for the pump, and which parts of the pump require cooling water?
Information on pump reversal can be found in many sources; the seal water serves to provide sealing and flushing functions. There is oil used to cool the bearing box, as well as another fluid used to cool the seals. I’ve also seen motors with cooling systems, ones that cool the motor’s stator; generally, fans are used to cool the motor.
This post was last edited by lizhenpeng on 2011-12-20 at 18:55. The key principle for switching between two backup devices is to first activate the backup device; once it is operating normally, then the main device is shut down. This applies to devices such as pumps, filters, coolers, and engines, etc. For information regarding machine seals, refer to the answer above – it’s already quite comprehensive
Firstly, the standby pump must be in condition to start operating; the cooling water (circulating water), seal flushing fluid, lubricating oil, etc., should all meet the requirements for starting up； Ensure that the pump inlet valve is fully open. First, start the standby pump; once its pressure stabilizes, gradually open the valve of the standby pump while closing the valve of the main pump. This is done until the flow rate and pressure of the standby pump meet the process requirements, at which point the valve of the main pump is fully closed and its power supply is cut off. The function of the sealing water is to flush and cool the seal. The parts of the pump that require cooling water are generally the bearing housings, seal heat exchangers, seal fluid storage tanks, and seal chamber cooling rooms; cooling water is also used for the rapid cooling of seals in some cases.