【Daily Question: Pump Equipment】Discussion Question 2019.5.21
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This post was last edited by 3983596_FPPZ on 2019-5-22 at 13:45. Rules for the discussion topic in bk14.jpg: 1. There is no standard answer； 2. Rewards are given based on the completeness and accuracy of the responses; 2 wealth points are awarded for each correctly answered key point, with the total reward ranging from 2 to 10 wealth points (for active participation and fully complete, accurate responses) ； 3. There is no limit on the number of responses per person, nor is there a limit on the number of rewards (the scoring administrator must control the total amount of rewards for each response) ； 4. The reward is valid for 72 hours; no reward will be given after that period. Another award for learning! Come by regularly to discuss this topic: For pump stations A, B, and C under the same operating conditions, with the same medium and at the same location, where one pump is in use while another serves as a backup, three identical single-stage centrifugal pumps were ordered. An additional impeller was ordered for each pump as a spare part. The manufacturer conducts factory tests on each complete pump before shipping it out once the tests are successful. Please discuss whether the outer diameters of these 6 impellers should be the same, and whether they can be used interchangeably Tip: Impeller castings from the same batch can vary, which leads to differences in hydraulic performance. Combined with the acceptance criteria used during testing, this results in slight variations in impeller diameter. It is recommended to label the components properly; generally, it is not advisable to interchange them arbitrarily.
The outer diameter of these 6 impellers should be the same, and the 6 impellers can be used interchangeably
The outer diameter of the impellers is the same; the impellers cannot be used interchangeably (the motors may vary)
The outer diameters of these 6 impellers should be the same, and the 6 impellers can be used interchangeably
Based on the analysis attempts of a beginner: 1. When the operating conditions are the same, with one pump in use and two as backups, and when a single pump is operating, these pumps can generally be interchanged. 2. If equal outlet parameters are to be maintained, then the inlet resistance for the pumps on either side will be higher than that of the pump in the middle; therefore, it might be necessary for the impellers of the pumps on those sides to be slightly larger
The outer diameter of the impeller in each pump at stations A, B, and C should be the same; for pumps ordered separately, different outer diameters can be specified. This facilitates the replacement of the impeller or the cutting of a new one when the existing impeller no longer meets the requirements, allowing the head to be adjusted to the appropriate level.
Produced by the same manufacturer, interchangeable!
The results of the factory tests show that the curves for each pump are different; therefore, swapping these impellers will cause changes in the pump’s operating parameters. Of course, in most cases these changes can be corrected through adjustments to the system. However, it is recommended not to replace them completely, unless it is absolutely necessary. As for the outer diameter of the impeller, although there may be some variations in pumps produced in bulk, there should not be significant differences in the outer diameter of the impeller; in my opinion, it should remain consistent.
The outer diameter of the impellers is the same; the impellers cannot be used interchangeably (the motors may vary)
Theoretically, they should all be the same. However, in a setup with one main pump and one backup pump, the flow rate or head capacity of the backup pump may differ slightly; accordingly, the impeller used for it only needs to be compatible with that specific pump.