Is there something wrong with the selection of this centrifugal pump?
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The optimal efficiency point flow rate is 750, yet the preferred operating range is set at 400–550, which is less than 70% of the optimal efficiency point flow rate. I’m not very familiar with the entire design and procurement process. I guess maybe the pump manufacturer didn’t have a pump with the specified flow rate as required by the design, so they supplied a pump of a larger size instead. But the specified flow rate is determined by the design, and the operating area should be defined based on that flow rate; so why is there such a large deviation?
Yes, there do seem to be some issues with the selection of the centrifugal pump. The Best Efficiency Point (BEP) refers to the flow rate at which the pump operates with the highest efficiency; generally, the operating range of the pump should be designed to be between 80% and 110% of the BEP. The preferred operating range for this pump is set at 400–550, which is well below 70% of the flow rate at its optimal efficiency point; this can result in low pump efficiency, increased energy consumption, and a reduced service life. A possible reason is that the rated flow rate specified during design does not match that of existing pump models on the market; therefore, the pump manufacturer provides larger-sized pumps to meet this rated flow rate requirement. In this case, the traffic requirements and the suitability of pump types should be re-evaluated within the design and procurement processes to avoid efficiency losses. .
Wasn’t this specified during the technical negotiations? Does the purchasing department go straight to buy using the design documents?
During the years when our factory was being built, the quality of the personnel involved was extremely poor. The technical specifications were prepared by the pump manufacturer, while the site conditions were specified by the design institute; the engineers were merely responsible for passing on messages. When the plant started operating in practice, many really frustrating problems arose...