Why isn’t it allowed to use the largest impeller in centrifugal pumps?
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Technical documents on centrifugal pumps usually mention why it is not allowed to use the largest impeller for such pumps. What is the reason for this?
“Why isn’t it allowed to use the largest impeller in centrifugal pumps? What is a maximum impeller?
Not choosing the largest impeller leaves a 5% margin. When technical upgrades are needed, it may be possible to achieve this by replacing the impeller, without the need to choose a new model or replace the entire pump.
When the head is insufficient due to on-site construction or other factors, this problem can be resolved by replacing it with a larger impeller
Leave some margin; if the requirements cannot be met later on, it is possible to meet them by modifying the impeller, otherwise the pump will need to be replaced.
When technical modifications are needed, it may be possible to achieve this by replacing the impeller, without the need to choose a new pump model or replace the entire pump
Most of what the above-mentioned people explained was aimed at changing the usability? Has the relationship between the size of the clearance and efficiency as well as energy consumption been taken into account? If my pump is operated at full load all year round, wouldn’t that be a waste of energy? ?
If your load varies, energy savings can be achieved entirely through variable frequency control.
This post was last edited by CHANGBAISHI on 2018-4-18 09:29. What I’m referring to are pumps that are specifically designed and selected for use with a particular device; if there is extra design margin in this regard, wouldn’t that be a waste? It is understandable if the pump comes out of the factory with a minimum margin (that is, a large impeller); the diameter of the impeller can be reduced by lowering the head as needed. . . . . . If it is a factory-produced product designed with a small impeller and large allowance. . . . Such a design is extremely irresponsible. I guess we need to pay attention to this aspect during future maintenance work.