All the pumps had been throttled down to a great extent. The discharge control valves were 40 to 50 percent open and the flow was at the rated levels of 800–900 m 3 /h. This ability to deliver the required nominal flow, even with 50 percent throttling, indicated that the pumps were significantly oversized for the existing system’s resistance and proved it was technically possible to trim the impellers. Trimming the impellers would ca

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