How to start centrifugal pump after an overhaul ？

How to start centrifugal pump after an overhaul ？

         Prior to starting, the centrifugal pump should be thoroughly inspected, and any abnormalities that are found 

should  be corrected. When practicable, the pump shaft should be turned by hand to ensure that it rotates freely.(In 

some cases, it  may be possible or advisable to turn the shaft by hand because of the size, configuration, or design of 

the pump.)    When starting a typical radial-flow centrifugal pump, the discharge stop valve should be almost completely 

closed, which will  generally reduce the load on the pump’s driver and the NPSH required by the pump. However, to 

reduce the potential for overheating due to insufficient flow through the pump, the duration of operation with the 

discharge valve in this choked-in position should be kept to a minimum.