Some questions about centrifugal pumps

I’m not an expert, but I’ll try to respond to your question as follows: 1. Within its normal service life, does the characteristic curve of a centrifugal pump change, and if so, how? During operation, as the gap between the retaining rings increases and the impeller wears out, the efficiency of the centrifugal pump gradually declines, but generally by no more than 10% (this is probably why API 610 stipulates that the shaft power of the motor must be 1 percent higher than the rated value of the pump). The specific manifestation is an increase in current and a slight decrease in outlet pressure. 2. Within what range around the rated power is efficiency higher? What are the adverse effects of operating slightly above the rated power over the long term? Assuming that the rated power you are referring to here is the power of the pump under its rated operating conditions, rather than the power indicated on the motor’s nameplate, the response is as follows: There is no fixed range for this, as the rated power is not necessarily the point of optimal efficiency. In other words, the answer to this question depends on the relative relationship between the rated operating point and the optimal efficiency point.

If the pump’s performance declines, its parts can be replaced; prolonged overcurrent can cause the cables and motor to overheat, leading to a shutdown.

Dear experts, I have a few questions I’d like to ask: 1. Within its normal service life, does the characteristic curve of a centrifugal pump change, and if so, how? Generally, performance degradation occurs due to wear of the sealing rings and impeller blades, resulting in reduced flow rate, lower head pressure, and increased energy consumption. Sealing rings are wear-prone components that usually need to be replaced every 1–2 years; however, if their performance meets the process requirements, it may not be necessary to replace them. 2. Within what range around the rated power is efficiency higher? What are the adverse effects of operating slightly above the rated power over the long term? It is generally required to operate within the range of 70% to 100% of the optimal efficiency point

Dear experts, I have a few questions I’d like to ask: 1. Within its normal service life, does the characteristic curve of a centrifugal pump change, and if so, how? Generally, performance degradation occurs due to wear of the sealing rings and impeller blades, resulting in reduced flow rate, lower head pressure, and increased energy consumption. Sealing rings are wear-prone components that usually need to be replaced every 1–2 years; however, if their performance meets the process requirements, it may not be necessary to replace them. 2. Within what range around the rated power is efficiency higher? What are the adverse effects of operating slightly above the rated power over the long term? It is generally required to operate within the range of 70% to 100% of the optimal efficiency point

The proportional relationship between H, Q, and R will wear out over time, and its performance and efficiency will definitely be inferior to those of new equipment. But you also need to consider your operating conditions. If the pump has excess efficiency, it can save some electricity over time