What consequences arise when a pump has insufficient flow, and what abnormal conditions do the equipment exhibit?
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I would like to ask what consequences occur when the pump has insufficient flow rate, and what abnormal conditions appear in the equipment. . Such as vibration and increased temperature of the casing, etc. Thank you :)
May I ask if the insufficient flow rate mentioned by the poster refers to an inadequate supply of feed to the pump? In such situations, cavitation (i.e., vacuum formation) tends to occur easily; the pump is prone to vibration and noise, the impeller gets corroded, and in severe cases, the shaft may get jammed due to intense vibration.
Yeah, right. Thanks, hey. . I have another question. When the traffic is insufficient. Is there significant friction within the pump? Frictional heat can cause vaporization. . . . Under normal load. Is the frictional heat significant?
Cavitation, excessive vibration, and high temperature rise have an impact on pumps; generally, a minimum flow return valve is installed
In this case, the pressure at the inlet of the pump impeller is usually equal to or even slightly lower than the vaporization pressure of the medium, causing the medium to vaporize and resulting in cavitation. It is not frictional heat that vaporizes the medium. Of course, if severe vibration caused by cavitation is such that the rotor components scrape against the stator components, very high heat is generated, leading to a sharp rise in local temperatures. The surrounding medium vaporizes more rapidly, worsening the operation of the pump, and accidents such as shaft seizure can occur in a very short time.
If the outlet of a centrifugal pump remains closed and the pump operates at idle, the liquid inside it can vaporize in large quantities, resulting in gas entrapment; this can cause excessive noise and vibration in the pump
The most serious issue is shaft seizure; one of our pumps developed cavitation due to the lack of exhaust before starting, and as a result, the impeller seized with the retaining ring!