Using a submersible pump in a large tank or large casing, I understand the need to force a certain amount of water flow past the motor for proper cooling.
But I see many of these flow inducer sleeve recommendations and pictures that look like the sleeve is barely larger than the motor housing diameter. Don't we need to keep a minimum amount of space between the motor housing and the inside diameter of the sleeve so that the appropriate volume of water can get to the pump? If the flow inducer sleeve is almost the same diameter as the motor housing, even with increased velocity, isn't there a chance of impeding the performance of the pump?
But I see many of these flow inducer sleeve recommendations and pictures that look like the sleeve is barely larger than the motor housing diameter. Don't we need to keep a minimum amount of space between the motor housing and the inside diameter of the sleeve so that the appropriate volume of water can get to the pump? If the flow inducer sleeve is almost the same diameter as the motor housing, even with increased velocity, isn't there a chance of impeding the performance of the pump?