Why can excessive deviation of the flow rate of a double-suction centrifugal pump from the design value lead to shaft breakage of the pump?
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Why is it said that in double-suction centrifugal pumps, a flow rate that deviates too much from the design value can easily lead to shaft breakage of the pump?
At the designed operating point, there should be no radial force; however, as the operating condition deviates from this point, the radial force increases, and the greater the deviation, the higher the radial force, which can easily lead to shaft failure.
It is recommended to check the connection between the pump foundation and the pump’s prestressing, as well as issues related to horizontal shims, bolt tightening, and secondary grouting. The claim that this flow value deviates from the broken shaft is not valid. Especially for double-suction pumps. Sometimes, when the flow rate suddenly increases due to a drop in pressure, the shaft breaks – haha, that’s impossible, right?
In double-suction centrifugal pumps, an asymmetric impeller can lead to uneven axial forces, and a flow rate that deviates too much from the design value can cause the pump to vibrate and generate increased noise.
Many double-suction pumps are experiencing shaft breaks these days. I’ve asked several seniors, and they say it’s a problem with the sealing ring; sigh, there’s no solution to it