Common Errors
The articles below contain clear explanations about commonly held misconceptions people have about pumps, fluid mechanics, and electricity. These misconceptions are like superstitions because, like superstitions, misconceptions can persist even in the face of facts sufficient to prove the misconception wrong.
Remember that unless stated otherwise, all information on this website assumes centrifugal pumps are the topic, Displacement pumps and all other non-centrifugal pumps are not considered in the documents and articles on this website.
First, read the question, then follow the link to learn more about the subject. The Errors are listed in chronological order, the most recently posted errors are first.
Submersible pumps, line shaft turbine pumps, and centrifugal pumps with flooded or pressurized suctions are not vulnerable to cavitation.
If a pump intake is clogged or restricted, the pump motor draws high current (the motor is under heavy load condition)
If a pump is operated with the discharge valve closed (shut-off), the motor draws maximum current (the motor is under maximum load).
If a pump is operated with the discharge valve closed (shut-off), the pump develops maximum pressure.
