Will direct discharge from the pump outlet cause overload?
Thread Content
When selecting a pump, if its rated head is high and the pipeline resistance loss during actual operation is low, then (under ideal extreme conditions, such as when the pipelines at the pump’s inlet and outlet can be considered extremely short, so that the pipeline resistance does not increase as the flow rate increases), the pump’s flow rate will rise indefinitely. Will this lead to an increase in shaft power and thus cause the pump to become overloaded?
It can be adjusted by the outlet valve
Yes, it’s equivalent to the situation where the sesame oil is in motion; the flow rate is at its maximum, making overload likely
Purely as a theoretical discussion!
Do you think the traffic volume will keep increasing indefinitely, for example, from a rated volume of 100 to 200 or even higher? (under the assumption that the inlet and outlet pipes are very short)
It will overload. Has the original poster seen an outlet without a reducer?
Purely hypothetical discussion. It has no practical significance
Overload is inevitable; generally, the power of the motor used in such systems is only slightly higher than its full-load capacity.
When selecting a water pump for use in production, flow rate is important. Both the pressure and head are slightly higher than the values specified in the design, so valves are installed at the pump outlet to regulate flow and pressure.
This depends on the curve shape of the centrifugal pump; as for whether it’s the \"overload\" mentioned by the poster, it depends on how the poster interprets it. Firstly, regarding what the original poster mentioned, an increase in traffic is necessary, but it won’t increase indefinitely. The reason given by the original poster is that the head selected for the pump is too high; in other words, there is still a pipeline head in the entire system. When the pump flow rate increases to a certain level, that is, when the pump’s head drops to equal the pipeline head, the pump’s flow rate will no longer increase. At this time, the current usually also increases, but it is not certain whether the current will overload. In some centrifugal pumps, the head curve drops sharply at the end, and the pump operates very unstably at this stage; therefore, operating in such conditions is quite dangerous.
It will definitely overload; I’ve seen cases where the motor shut down due to excessive current caused by using a pump with too high a capacity. We then helped them fix it by using a cutting impeller or by installing a variable frequency drive.