What are the consequences of operating a centrifugal pump for an extended period with its outlet valve closed?
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Running a centrifugal pump with its outlet valve closed for an extended period of time means that the liquid in the pipeline will heat up, as all of the pump’s mechanical energy is converted into internal energy. Other than that, operating in this way is harmful to the pump. I really want to know how it affects pumps, causing them to malfunction or get damaged
With a fiberglass pump, if the outlet is not opened and the pump operates for a long time, the pump casing will crack； If neither import nor export is allowed, the pump casing will also break. Let’s talk about pumps made of other materials
This post was last edited by averagejoe0202 on 2017-3-2 at 17:06. If the outlet valve of the centrifugal pump remains closed for an extended period, mechanical energy is converted into internal energy, causing the fluid to heat up; this in turn leads to the formation of non-condensable gases and cavitation. If the outlet is not open, the pressure generally won’t build up. The mechanical seal is the weak point of a pump; it’s common to hear that pumps can leak, and this is usually due to problems with the mechanical seal. Looking forward to the expert's reply.
Plastic pumps can experience thermal deformation, leakage, and damage, leading to shutdown. Metal pumps may experience cavitation, and the mechanical seal may be damaged and leak.
If the outlet is not open, the medium will heat up, which can lead to cavitation and damage to the impeller. Moreover, high temperatures have an impact on the mechanical seal, bearings, and pump casing as well!
If the outlet valve is not opened for an extended period of time, the temperature will rise, which first causes the plastic in the mechanical seal to soften; it may even age and lead to leaks. The other issues are as mentioned above.
Do not run the pump for a long time with the outlet valve closed! Why isn’t the electricity in your home used up? Go against the boss?
Due to operational errors, one has to consider the consequences
When hot water vaporizes, the packing smokes and becomes unusable. Bearing scrapped
It seems the mechanical seal needs to be replaced; it’s probably due to issues with operation and monitoring