I have an application where the pump recirculation piping tie-in into the pump suction. If possible, I would like some best practices/guidelines to the following:
1. Temperature rise during circulation I have seen equations where calculations look at temperature increase when the pump is throttled. What is the calculation approach when the pump is in circulation to its suction? I have tried different approaches, e.g., one where I used the volume of the circuit and treated the calculation like heat input into a tank after a certain time period. The other approach is where I estimated the time a given molecule moves through the circuit before it enters the pump again. Both these approaches result in different times based on a given temperature rise. Please advise.
2. Also I would like to know guidelines/best practices on where to place the spillback return to the suction.
Have an insight or suggestion?
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Re: Can you offer best practices and guidelines for pump recirculation?
4 February 2010 at 1:29pmI must confess to finding item 1 of your email quite confusing. I know you want to calculate a temperature rise somewhere for some reason, but am not sure where or why!
As far as the recirculation from the discharge of a pump is concerned, this is usually done to keep the pump running as close as possible to the Best Efficiency Point, and thus well away from any low flow condition that would cause a number of problems, the least of which would be a temperature increase of the product. The recirculation line should be taken from a point in the discharge side of the pump and led back to the suction source (i.e., not the piping) in such a way that it does not cause any turbulence in the suction system.
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