Instructions for acceptance requirements of centrifugal pumps

Thread Content

1. The supplier should ensure that the centrifugal pump can operate stably and safely for a long time under full load conditions. As the flow rate decreases, the pump’s head curve should rise smoothly, and the pump’s shut-off head should be 120% to 125% of its designed head. 2. The flow-through components of corrosion-resistant centrifugal pumps are required to be resistant to acids and alkalis as well as wear-resistant ； 3. The first critical speed of the centrifugal pump should not fall within the range of 75~125% of the rated speed. 4. All centrifugal pump models should operate without cavitation within the range from minimum to maximum flow rate, with stable and low vibration levels. 5. All rotating components must be dynamically and statically balanced. 6. The guaranteed service life of all overcurrent components, including the impeller, bearings, front and rear shields, seals, etc., is over 20,000 operating hours. 7. All pumps shall be equipped with flexible couplings, as well as coupling guards. Precise alignment of the coupling. The rated output of the coupling and gears must be at least 120% of the maximum required output power. 8. The selection of pump body materials and lubricants should take into account the influence of ambient temperature. 9. The pump casing should be designed for easy maintenance, allowing for inspection, adjustment, and repair without affecting the main pipelines and valves. 10. The mechanical seal components equipped on the pump should be stable and reliable, and all wear parts should be easy to replace. 11. The supplier ensures that the vibration and noise of the pump during operation are within reasonable limits. The detection of vibration amplitude is based on the vibration of the thrust bearing or motor bearing. 12. All pipeline connections of the pump are flanged connections. 13. The supplier is responsible for providing a rectangular common base plate for installing the pump/electrical motor components. When the pump is removed, the water inside the pump chamber will flow through this base plate into the drainage pipes laid in place, thus avoiding contamination of the surrounding environment and equipment. 14. The design of the pump should take into account ease of maintenance. Lifting lugs should be provided on the pump body and motor to facilitate maintenance. 15. Pumps of the same model provided by the supplier use identical casings and impellers of the same diameter; all other components, including spare parts and replacement assemblies, are fully interchangeable.